Pub Date : 2023-09-01DOI: 10.5140/jass.2023.40.3.101
Young-Sook Lee, Ram Singh, Geonhwa Jee, Young-Sil Kwak, Yong Ha Kim
We conducted a statistical study of polar mesospheric summer echoes (PMSEs) in relation to magnetic local time (MLT), considering the geomagnetic conditions using the K-index (or K). Additionally, we performed a case study to examine the velocity profile, specifically for high velocities (≥ ~100 m/s) varying with high temporal resolution at high K-index values. This study utilized the PMSE data obtained from the mesosphere–stratosphere–troposphere radar located in Esrange, Sweden (63.7°N, 21°E). The change in K-index in terms of MLT was high (K ≥ 4) from 23 to 04 MLT, estimated for the time PMSE was present. During the near-midnight period (0–4 MLT), both PMSE occurrence and signal-to-noise ratio (SNR) displayed an asymmetric structure with upper curves for K ≥ 3 and lower curves for K < 3. Furthermore, the occurrence of high velocities peaked at 3–4 MLT for K ≥ 3. From case studies focusing on the 0–3 MLT period, we observed persistent eastward-biased high velocities (≥ 200 m/s) prevailing for ~18 min. These high velocities were accompanied with the systematic motion of profiles at 85–88 km, including large shear formation. Importantly, the rapid variations observed in velocity could not be attributed to neutral wind effects. The present findings suggest a strong substorm influence on PMSE, especially in the midnight and early dawn sectors. The large zonal drift observed in PMSE were potentially energized by local electromagnetic fields or the global convection field induced by the electron precipitation during substorms.
{"title":"Polar Mesospheric Summer Echo Characteristics in Magnetic Local Time and Height Profiles","authors":"Young-Sook Lee, Ram Singh, Geonhwa Jee, Young-Sil Kwak, Yong Ha Kim","doi":"10.5140/jass.2023.40.3.101","DOIUrl":"https://doi.org/10.5140/jass.2023.40.3.101","url":null,"abstract":"We conducted a statistical study of polar mesospheric summer echoes (PMSEs) in relation to magnetic local time (MLT), considering the geomagnetic conditions using the K-index (or K). Additionally, we performed a case study to examine the velocity profile, specifically for high velocities (≥ ~100 m/s) varying with high temporal resolution at high K-index values. This study utilized the PMSE data obtained from the mesosphere–stratosphere–troposphere radar located in Esrange, Sweden (63.7°N, 21°E). The change in K-index in terms of MLT was high (K ≥ 4) from 23 to 04 MLT, estimated for the time PMSE was present. During the near-midnight period (0–4 MLT), both PMSE occurrence and signal-to-noise ratio (SNR) displayed an asymmetric structure with upper curves for K ≥ 3 and lower curves for K < 3. Furthermore, the occurrence of high velocities peaked at 3–4 MLT for K ≥ 3. From case studies focusing on the 0–3 MLT period, we observed persistent eastward-biased high velocities (≥ 200 m/s) prevailing for ~18 min. These high velocities were accompanied with the systematic motion of profiles at 85–88 km, including large shear formation. Importantly, the rapid variations observed in velocity could not be attributed to neutral wind effects. The present findings suggest a strong substorm influence on PMSE, especially in the midnight and early dawn sectors. The large zonal drift observed in PMSE were potentially energized by local electromagnetic fields or the global convection field induced by the electron precipitation during substorms.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135349564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.5140/jass.2023.40.3.123
Young-Joo Song, Jonghee Bae, SeungBum Hong, Jun Bang, Donghun Lee
This paper presents an analysis of the trans-lunar trajectory insertion performance of the Korea Pathfinder Lunar Orbiter (KPLO), the first lunar exploration spacecraft of the Republic of Korea. The successful launch conducted on August 4, 2022 (UTC), utilized the SpaceX Falcon 9 rocket from Cape Canaveral Space Force Station. The trans-lunar trajectory insertion performance plays a crucial role in ensuring the overall mission success by directly influencing the spacecraft’s onboard fuel consumption. Following separation from the launch vehicle (LV), a comprehensive analysis of the trajectory insertion performance was performed by the KPLO flight dynamics (FD) team. Both orbit parameter message (OPM) and orbit determination (OD) solutions were employed using deep space network (DSN) tracking measurements. As a result, the KPLO was accurately inserted into the ballistic lunar transfer (BLT) trajectory, satisfying all separation requirements at the target interface point (TIP), including launch injection energy per unit mass (C3), right ascension of the injection orbit apoapsis vector (RAV), and declination of the injection orbit apoapsis vector (DAV). The precise BLT trajectory insertion facilitated the smoother operation of the KPLO’s remainder mission phase and enabled the utilization of reserved fuel, consequently significantly enhancing the possibilities of an extended mission.
{"title":"Post Trajectory Insertion Performance Analysis of Korea Pathfinder Lunar Orbiter Using SpaceX Falcon 9","authors":"Young-Joo Song, Jonghee Bae, SeungBum Hong, Jun Bang, Donghun Lee","doi":"10.5140/jass.2023.40.3.123","DOIUrl":"https://doi.org/10.5140/jass.2023.40.3.123","url":null,"abstract":"This paper presents an analysis of the trans-lunar trajectory insertion performance of the Korea Pathfinder Lunar Orbiter (KPLO), the first lunar exploration spacecraft of the Republic of Korea. The successful launch conducted on August 4, 2022 (UTC), utilized the SpaceX Falcon 9 rocket from Cape Canaveral Space Force Station. The trans-lunar trajectory insertion performance plays a crucial role in ensuring the overall mission success by directly influencing the spacecraft’s onboard fuel consumption. Following separation from the launch vehicle (LV), a comprehensive analysis of the trajectory insertion performance was performed by the KPLO flight dynamics (FD) team. Both orbit parameter message (OPM) and orbit determination (OD) solutions were employed using deep space network (DSN) tracking measurements. As a result, the KPLO was accurately inserted into the ballistic lunar transfer (BLT) trajectory, satisfying all separation requirements at the target interface point (TIP), including launch injection energy per unit mass (C3), right ascension of the injection orbit apoapsis vector (RAV), and declination of the injection orbit apoapsis vector (DAV). The precise BLT trajectory insertion facilitated the smoother operation of the KPLO’s remainder mission phase and enabled the utilization of reserved fuel, consequently significantly enhancing the possibilities of an extended mission.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135349563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.5140/jass.2023.40.3.93
Jannatun Nawer, Takehiko Ishikawa, Hirohisa Oda, Chihiro Koyama, Douglas M. Matson
A study of uncertainty analysis was conducted on four key thermophysical properties of molten Platinum using a non-contacting levitation technique. More specifically, this work demonstrates a detailed reporting of the uncertainties associated with the density, volumetric thermal expansion coefficient, surface tension and viscosity measurements at higher temperatures for a widely used refractory metal, Platinum using electrostatic levitation (ESL). The microgravity experiments were conducted using JAXA’s Electrostatic Levitation Furnace (ELF) facility on the International Space Station and the terrestrial experiments were conducted using NASA’s Marshal Space Flight Center’s ESL facility. The performance of these two facilities were then quantified based on the measurement precision and accuracy using the metrological International Standards Organization’s Guide to the Expression of Uncertainty Measurement (GUM) principles.
{"title":"Uncertainty Quantification of Thermophysical Property Measurement in Space and on Earth: A Study of Liquid Platinum Using Electrostatic Levitation","authors":"Jannatun Nawer, Takehiko Ishikawa, Hirohisa Oda, Chihiro Koyama, Douglas M. Matson","doi":"10.5140/jass.2023.40.3.93","DOIUrl":"https://doi.org/10.5140/jass.2023.40.3.93","url":null,"abstract":"A study of uncertainty analysis was conducted on four key thermophysical properties of molten Platinum using a non-contacting levitation technique. More specifically, this work demonstrates a detailed reporting of the uncertainties associated with the density, volumetric thermal expansion coefficient, surface tension and viscosity measurements at higher temperatures for a widely used refractory metal, Platinum using electrostatic levitation (ESL). The microgravity experiments were conducted using JAXA’s Electrostatic Levitation Furnace (ELF) facility on the International Space Station and the terrestrial experiments were conducted using NASA’s Marshal Space Flight Center’s ESL facility. The performance of these two facilities were then quantified based on the measurement precision and accuracy using the metrological International Standards Organization’s Guide to the Expression of Uncertainty Measurement (GUM) principles.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135349566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.5140/jass.2023.40.2.91
K. N. Shukla, J. Kumari, R. S. Pandey
{"title":"Response to the Comment by Chandra S on “Interaction of Ion\u0000 Cyclotron Electromagnetic Wave with Energetic Particles in the Existence of\u0000 Alternating Electric (AC) Field Using Ring Distribution”","authors":"K. N. Shukla, J. Kumari, R. S. Pandey","doi":"10.5140/jass.2023.40.2.91","DOIUrl":"https://doi.org/10.5140/jass.2023.40.2.91","url":null,"abstract":"","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85470428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.5140/jass.2023.40.2.67
Heon-Young Chang
The Titius-Bode’s relation has been historically successful in predicting the location of Ceres in the solar system, while its physical basis remains hidden. In this study, we attempt to answer the question of whether the Titius-Bode’s relation is universally valid for exoplanetary systems with plural exoplanets. For this purpose, we statistically study the distribution of the ratio of the orbiting periods of two planets in 32 exoplanetary systems hosted by a single star. We only consider the period ratios derived from exoplanets orbiting a single star since celestial objects under investigation are kept as simple as possible and free from uncertainties such as the mass of the host star. We find that the distribution of period ratios of two exoplanets appears inconsistent with that derived from the Titius-Bode’s relation using the χ2 test. We also found that the distance distribution in exoplanetary systems unlikely follows the uniform distribution or the Poisson’s distribution. It is noted, however, that more rigorous statistical tests should be carried out to reach a more certain conclusion.
{"title":"Titius-Bode’s Relation in Exoplanetary Systems","authors":"Heon-Young Chang","doi":"10.5140/jass.2023.40.2.67","DOIUrl":"https://doi.org/10.5140/jass.2023.40.2.67","url":null,"abstract":"\u0000 The Titius-Bode’s relation has been historically successful in predicting\u0000 the location of Ceres in the solar system, while its physical basis remains\u0000 hidden. In this study, we attempt to answer the question of whether the\u0000 Titius-Bode’s relation is universally valid for exoplanetary systems with\u0000 plural exoplanets. For this purpose, we statistically study the distribution of\u0000 the ratio of the orbiting periods of two planets in 32 exoplanetary systems\u0000 hosted by a single star. We only consider the period ratios derived from\u0000 exoplanets orbiting a single star since celestial objects under investigation\u0000 are kept as simple as possible and free from uncertainties such as the mass of\u0000 the host star. We find that the distribution of period ratios of two exoplanets\u0000 appears inconsistent with that derived from the Titius-Bode’s relation\u0000 using the χ2 test. We also found that the\u0000 distance distribution in exoplanetary systems unlikely follows the uniform\u0000 distribution or the Poisson’s distribution. It is noted, however, that\u0000 more rigorous statistical tests should be carried out to reach a more certain\u0000 conclusion.\u0000","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74158938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.5140/jass.2023.40.2.45
A. Cherkos
This study examined the effect of solar flux (F10.7) and sunspots number (R) on the daily variation of equatorial electrojet (EEJ) and morning/afternoon counter electrojet (MCEJ/ACEJ) in the ionospheric E region across the eight longitudinal sectors during quiet days from January 2008 to December 2013. In particular, we focus on both minimum and maximum solar cycle of 24. For this purpose, we have collected a 6-year ground-based magnetic data from multiple stations to investigate EEJ/CEJ climatology in the Peruvian, Brazilian, West & East African, Indian, Southeast Asian, Philippine, and Pacific sectors with the corresponding F10.7 and R data from satellites simultaneously. Our results reveal that the variations of monthly mean EEJ intensities were consistent with the variations of solar flux and sunspot number patterns of a cycle, further indicating that there is a significant seasonal and longitudinal dependence. During the high solar cycle period, F10.7 and R have shown a strong peak around equinoctial months, consequently, the strong daytime EEJs occurred in the Peruvian and Southeast Asian sectors followed by the Philippine regions throughout the years investigated. In those sectors, the correlation between the day Maxima EEJ and F10.7 strengths have a positive value during periods of high solar activity, and they have relatively higher values than the other sectors. A predominance of MCEJ occurrences is observed in the Brazilian (TTB), East African (AAE), and Peruvian (HUA) sectors. We have also observed the CEJ dependence on solar flux with an anti-correlation between ACEJ events and F10.7 are observed especially during a high solar cycle period.
{"title":"Solar Flux Effects on the Variations of Equatorial Electrojet (EEJ)\u0000 and Counter-Electrojet (CEJ) Current across the Different Longitudinal Sectors\u0000 during Low and High Solar Activity","authors":"A. Cherkos","doi":"10.5140/jass.2023.40.2.45","DOIUrl":"https://doi.org/10.5140/jass.2023.40.2.45","url":null,"abstract":"\u0000 \u0000 This study examined the effect of solar flux (F10.7) and sunspots number (R) on\u0000 the daily variation of equatorial electrojet (EEJ) and morning/afternoon counter\u0000 electrojet (MCEJ/ACEJ) in the ionospheric E region across the eight longitudinal\u0000 sectors during quiet days from January 2008 to December 2013. In particular, we\u0000 focus on both minimum and maximum solar cycle of 24. For this purpose, we have\u0000 collected a 6-year ground-based magnetic data from multiple stations to\u0000 investigate EEJ/CEJ climatology in the Peruvian, Brazilian, West & East\u0000 African, Indian, Southeast Asian, Philippine, and Pacific sectors with the\u0000 corresponding F10.7 and R data from satellites simultaneously. Our results\u0000 reveal that the variations of monthly mean EEJ intensities were consistent with\u0000 the variations of solar flux and sunspot number patterns of a cycle, further\u0000 indicating that there is a significant seasonal and longitudinal dependence.\u0000 During the high solar cycle period, F10.7 and R have shown a strong peak around\u0000 equinoctial months, consequently, the strong daytime EEJs occurred in the\u0000 Peruvian and Southeast Asian sectors followed by the Philippine regions\u0000 throughout the years investigated. In those sectors, the correlation between the\u0000 day Maxima EEJ and F10.7 strengths have a positive value during periods of high\u0000 solar activity, and they have relatively higher values than the other sectors. A\u0000 predominance of MCEJ occurrences is observed in the Brazilian (TTB), East\u0000 African (AAE), and Peruvian (HUA) sectors. We have also observed the CEJ\u0000 dependence on solar flux with an anti-correlation between ACEJ events and F10.7\u0000 are observed especially during a high solar cycle period.\u0000","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74606598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.5140/jass.2023.40.2.89
S. Chandra
It is already discussed categorically and in detail that for the alternating current (AC) electric field parallel to the magnetic field, the dispersion relation is too complicated and cannot be expressed through a simple expression. As they claim to use a simple relation, which cannot be applicable, the results of Shukla et al. (2022) are not reliable. Propagation of waves through a magnetized plasma having AC electric field has been discussed in detail in literature. For propagation of waves in plasma, the dielectric tensor is expressed by Summers et al. (1994), where εij are (nine) elements of dielectric tensor ε, and the wavevector is k = k⊥i ^ + kǁ k ^ , where i ^ and k ^ are, respectively, unit vector along the x-axis and z-axis of Cartesian coordinate system. Let us review our earlier work in brief. We have investigated two cases: (i) the magnetic field is perpendicular to the AC electric field (Chandra & Sharma 2020a), and (ii) the magnetic field is parallel to the AC electric field (Chandra & Sharma 2020b). Chandra & Sharma (2020a) considered the case of AC electric field E0 = E0 sin νt i ^ , and ambient magnetic field B = B0k ^ , i.e., the direction of the electric field is perpendicular to the direction of the magnetic field. For the propagation of wave parallel to the magnetic filed (i.e., along the z-axis), we have k⊥ = 0, kǁ = k, N⊥ = 0 and Nǁ = N. Therefore, ε13 = ε31 = ε23 = ε32 = 0, so that, we have
对于平行于磁场的交流电场，色散关系过于复杂，不能用一个简单的表达式来表示。Shukla et al.(2022)的结果不可靠，因为他们声称使用了一个简单的关系，这是不适用的。已有文献详细讨论了波在具有交流电场的磁化等离子体中的传播。对于波在等离子体中的传播，介质张量由Summers et al.(1994)表示，其中εij是介电张量ε的(9)个元素，波向量为k = k⊥i ^ + kk ^，其中i ^和k ^分别是沿笛卡尔坐标系的x轴和z轴的单位矢量。让我们简单地回顾一下我们以前的工作。我们研究了两种情况:(i)磁场垂直于交流电场(Chandra & Sharma 2020a)， (ii)磁场平行于交流电场(Chandra & Sharma 2020b)。Chandra & Sharma (2020a)考虑了交流电场E0 = E0 sin νt i ^，环境磁场B = B0k ^的情况，即电场方向垂直于磁场方向。对于与磁场平行的波的传播(即沿z轴)，我们有k⊥= 0,k_ = k, N⊥= 0和n_ = N。因此，ε13 = ε31 = ε23 = ε32 = 0，所以，我们有
{"title":"Comment on “Interaction of Ion Cyclotron Electromagnetic Wave\u0000 with Energetic Particles in the Existence of Alternating Electric Field Using\u0000 Ring Distribution” by Shukla KN, Kumari J, Pandey RS","authors":"S. Chandra","doi":"10.5140/jass.2023.40.2.89","DOIUrl":"https://doi.org/10.5140/jass.2023.40.2.89","url":null,"abstract":"It is already discussed categorically and in detail that for the alternating current (AC) electric field parallel to the magnetic field, the dispersion relation is too complicated and cannot be expressed through a simple expression. As they claim to use a simple relation, which cannot be applicable, the results of Shukla et al. (2022) are not reliable. Propagation of waves through a magnetized plasma having AC electric field has been discussed in detail in literature. For propagation of waves in plasma, the dielectric tensor is expressed by Summers et al. (1994), where εij are (nine) elements of dielectric tensor ε, and the wavevector is k = k⊥i ^ + kǁ k ^ , where i ^ and k ^ are, respectively, unit vector along the x-axis and z-axis of Cartesian coordinate system. Let us review our earlier work in brief. We have investigated two cases: (i) the magnetic field is perpendicular to the AC electric field (Chandra & Sharma 2020a), and (ii) the magnetic field is parallel to the AC electric field (Chandra & Sharma 2020b). Chandra & Sharma (2020a) considered the case of AC electric field E0 = E0 sin νt i ^ , and ambient magnetic field B = B0k ^ , i.e., the direction of the electric field is perpendicular to the direction of the magnetic field. For the propagation of wave parallel to the magnetic filed (i.e., along the z-axis), we have k⊥ = 0, kǁ = k, N⊥ = 0 and Nǁ = N. Therefore, ε13 = ε31 = ε23 = ε32 = 0, so that, we have","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84202265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.5140/jass.2023.40.2.79
Young-Joo Song, Seung-Su Hong, Dong-Gyu Kim, Jun Bang, Jonghee Bae
On Aug. 4, 2022, at 23:08:48 (UTC), the Korea Pathfinder Lunar Orbiter (KPLO), also known as Danuri, was launched using a SpaceX Falcon 9 launch vehicle. Currently, KPLO is successfully conducting its science mission around the Moon. The National Aeronautics and Space Administration (NASA)’s Deep Space Network (DSN) was utilized for the successful flight operation of KPLO. A great deal of joint effort was made between the Korea Aerospace Research Institute (KARI) and NASA DSN team since the beginning of KPLO ground system design for the success of the mission. The efficient utilization and management of NASA DSN in deep space exploration are critical not only for the spacecraft’s telemetry and command but also for tracking the flight dynamics (FD) operation. In this work, the top-level DSN interface architecture, detailed workflows, DSN support levels, and practical lessons learned from the joint team’s efforts are presented for KPLO’s successful FD operation. Due to the significant joint team’s efforts, KPLO is currently performing its mission smoothly in the lunar mission orbit. Through KPLO cooperative operation experience with DSN, a more reliable and efficient partnership is expected not only for Korea’s own deep space exploration mission but also for the KARI-NASA DSN joint support on other deep space missions in the future.
{"title":"Lessons Learned from Korea Pathfinder Lunar Orbiter Flight Dynamics\u0000 Operations: NASA Deep Space Network Interfaces and Support\u0000 Levels","authors":"Young-Joo Song, Seung-Su Hong, Dong-Gyu Kim, Jun Bang, Jonghee Bae","doi":"10.5140/jass.2023.40.2.79","DOIUrl":"https://doi.org/10.5140/jass.2023.40.2.79","url":null,"abstract":"\u0000 On Aug. 4, 2022, at 23:08:48 (UTC), the Korea Pathfinder Lunar Orbiter (KPLO),\u0000 also known as Danuri, was launched using a SpaceX Falcon 9 launch vehicle.\u0000 Currently, KPLO is successfully conducting its science mission around the Moon.\u0000 The National Aeronautics and Space Administration (NASA)’s Deep Space\u0000 Network (DSN) was utilized for the successful flight operation of KPLO. A great\u0000 deal of joint effort was made between the Korea Aerospace Research Institute\u0000 (KARI) and NASA DSN team since the beginning of KPLO ground system design for\u0000 the success of the mission. The efficient utilization and management of NASA DSN\u0000 in deep space exploration are critical not only for the spacecraft’s\u0000 telemetry and command but also for tracking the flight dynamics (FD) operation.\u0000 In this work, the top-level DSN interface architecture, detailed workflows, DSN\u0000 support levels, and practical lessons learned from the joint team’s\u0000 efforts are presented for KPLO’s successful FD operation. Due to the\u0000 significant joint team’s efforts, KPLO is currently performing its\u0000 mission smoothly in the lunar mission orbit. Through KPLO cooperative operation\u0000 experience with DSN, a more reliable and efficient partnership is expected not\u0000 only for Korea’s own deep space exploration mission but also for the\u0000 KARI-NASA DSN joint support on other deep space missions in the future.\u0000","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82505361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.5140/jass.2023.40.2.59
Hee-Bok Ahn, Jaeyoung Kwak, Jung-Lae Hwang
Since the World Health Organization (WHO) officially announced a global pandemic on March 12, 2020, the aviation industry in the world has been experiencing difficulties for a long time. Meanwhile, the Ukraine war broke out in February, and from March 15, domestic airlines must operate air routes bypassing Russian airspace despite the longer flight time. Therefore, as the flight time increases, the cosmic radiation exposure dose of the crew members is also expected to increase. Here we compare the radiation exposure dose between the route doses for the eastern United States and Europe before and after the detour route usage. Through the comparison analysis, we tried to understand how cosmic radiation changes depending on the flight time and the latitude and which one contributes more. We expect that this study can be used for the policy update for the safety management of cosmic radiation for aircrews in Korea.
{"title":"Comparative Analysis of Cosmic Radiation Exposure Dose Due to the\u0000 Russian Detour Route","authors":"Hee-Bok Ahn, Jaeyoung Kwak, Jung-Lae Hwang","doi":"10.5140/jass.2023.40.2.59","DOIUrl":"https://doi.org/10.5140/jass.2023.40.2.59","url":null,"abstract":"\u0000 Since the World Health Organization (WHO) officially announced a global pandemic\u0000 on March 12, 2020, the aviation industry in the world has been experiencing\u0000 difficulties for a long time. Meanwhile, the Ukraine war broke out in February,\u0000 and from March 15, domestic airlines must operate air routes bypassing Russian\u0000 airspace despite the longer flight time. Therefore, as the flight time\u0000 increases, the cosmic radiation exposure dose of the crew members is also\u0000 expected to increase. Here we compare the radiation exposure dose between the\u0000 route doses for the eastern United States and Europe before and after the detour\u0000 route usage. Through the comparison analysis, we tried to understand how cosmic\u0000 radiation changes depending on the flight time and the latitude and which one\u0000 contributes more. We expect that this study can be used for the policy update\u0000 for the safety management of cosmic radiation for aircrews in Korea.\u0000","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82063294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-01DOI: 10.5140/jass.2023.40.1.1
G. Jee, E. Ji, Eunsol Kim, Y. Kwak, Changsup Lee, H. Kwon, Ji-Eun Kim, Young-bae Ham, Ji-Hee Lee, Jeong‐Han Kim, Tae-Yong Yang, H. Kam
Korea Polar Research Institute (KOPRI) and Korea Astronomy and Space Institute (KASI) have been participating in the European Incoherent Scatter (EISCAT) Scientific Association as an affiliate institution in order to observe the polar ionosphere since 2015. During the period of December 16–21, 2016 and January 3–9, 2018, the observations for the polar ionospheric parameters such as the electron density profiles, ion drift, and electron/ion temperature are carried out in the polar cap/cusp region by the EISCAT Svalbard radar (ESR). The purpose of the observations is to investigate the characteristic of the winter ionosphere in the dayside polar cap/cusp region. In this paper, we briefly report the results of the ESR observations for winter daytime ionosphere and also the simultaneous observations for the ionosphere-thermosphere system together with the balloon-borne instrument High-Altitude Interferometer WIND Experiment (HIWIND) performed by the High Altitude Observatory (HAO), National Center for Atmospheric Research (NCAR). We further introduce our research activities using long-term EISCAT observations for the occurrence of ion upflow and the climatology of the polar ionospheric density profiles in comparison with the mid-latitude ionosphere. Finally, our future research plans will briefly be introduced.
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