Pub Date : 2023-02-01DOI: 10.31577/caosp.2023.53.1.17
Y. Vasylkivskyi, S. Stepkin, O. O. Konovalenko
{"title":"The low-frequency carbon radio recombination lines in medium toward S140 nebula","authors":"Y. Vasylkivskyi, S. Stepkin, O. O. Konovalenko","doi":"10.31577/caosp.2023.53.1.17","DOIUrl":"https://doi.org/10.31577/caosp.2023.53.1.17","url":null,"abstract":"","PeriodicalId":50617,"journal":{"name":"Contributions of the Astronomical Observatory Skalnate Pleso","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48409187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.31577/caosp.2023.53.1.7
P.-J. Chen, Z. Wang
. The observed light curves of the microquasar GRS 1915+105 show three main characteristics, namely chaotic, stochastic and semi-stochastic (or nonstochastic). In order to probe the origin causing these different features, we propose a stochastic nonlinear self-oscillatory model of an accretion disk, and use its oscillating luminosities with different noise strengths and nonlinear factors to simulate the observational variability, and compare their correlation dimensions calculated by a nonlinear time series analysis. It is shown that when the stochastic noise strength is small and the nonlinear factor is large, the luminosity curves show chaotic behavior. On the contrary, it shows stochastic or semi-stochastic behavior when a stochastic factor dominates. The simulated data exhibits the same nonlinear and random characteristics as the observational sequences, and their corresponding correlation dimensions are also consistent. This indicates that the X-ray bursting of the microquasar should be related to a nonlinear self-oscillation of the accretion disk.
{"title":"Stochastic nonlinear self-oscillatory model of an accretion disk for the X-ray bursting of the microquasar GRS 1915+105","authors":"P.-J. Chen, Z. Wang","doi":"10.31577/caosp.2023.53.1.7","DOIUrl":"https://doi.org/10.31577/caosp.2023.53.1.7","url":null,"abstract":". The observed light curves of the microquasar GRS 1915+105 show three main characteristics, namely chaotic, stochastic and semi-stochastic (or nonstochastic). In order to probe the origin causing these different features, we propose a stochastic nonlinear self-oscillatory model of an accretion disk, and use its oscillating luminosities with different noise strengths and nonlinear factors to simulate the observational variability, and compare their correlation dimensions calculated by a nonlinear time series analysis. It is shown that when the stochastic noise strength is small and the nonlinear factor is large, the luminosity curves show chaotic behavior. On the contrary, it shows stochastic or semi-stochastic behavior when a stochastic factor dominates. The simulated data exhibits the same nonlinear and random characteristics as the observational sequences, and their corresponding correlation dimensions are also consistent. This indicates that the X-ray bursting of the microquasar should be related to a nonlinear self-oscillation of the accretion disk.","PeriodicalId":50617,"journal":{"name":"Contributions of the Astronomical Observatory Skalnate Pleso","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43569060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.31577/caosp.2023.53.1.28
A. Yilmaz
,
{"title":"Appropriate site selection for the astronomical observatory - Erzincan province sample application","authors":"A. Yilmaz","doi":"10.31577/caosp.2023.53.1.28","DOIUrl":"https://doi.org/10.31577/caosp.2023.53.1.28","url":null,"abstract":",","PeriodicalId":50617,"journal":{"name":"Contributions of the Astronomical Observatory Skalnate Pleso","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42146726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.31577/caosp.2023.53.1.58
M. Vavrukh, D. Dzikovskyi
. Approximate, but highly accurate analytical solutions of Kepler’s equation were found by reducing it to an algebraic equation. With the help of this approach and usage of the iterative algorithm there were obtained solutions of a similar equation for the hyperbolic motion near the orbit pericenter
{"title":"Analytical images of Kepler's equation solutions and its analogues","authors":"M. Vavrukh, D. Dzikovskyi","doi":"10.31577/caosp.2023.53.1.58","DOIUrl":"https://doi.org/10.31577/caosp.2023.53.1.58","url":null,"abstract":". Approximate, but highly accurate analytical solutions of Kepler’s equation were found by reducing it to an algebraic equation. With the help of this approach and usage of the iterative algorithm there were obtained solutions of a similar equation for the hyperbolic motion near the orbit pericenter","PeriodicalId":50617,"journal":{"name":"Contributions of the Astronomical Observatory Skalnate Pleso","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42082260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.31577/caosp.2023.53.1.46
M. Vavrukh, D. Dzikovskyi
{"title":"Optimal conditions of the spacecraft acceleration in the gravitational field of planet","authors":"M. Vavrukh, D. Dzikovskyi","doi":"10.31577/caosp.2023.53.1.46","DOIUrl":"https://doi.org/10.31577/caosp.2023.53.1.46","url":null,"abstract":"","PeriodicalId":50617,"journal":{"name":"Contributions of the Astronomical Observatory Skalnate Pleso","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47019100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.31577/caosp.2022.52.3.44
L. Abu El Maati, M. Ahmad, I. S. Mahmoud, S. Tawfik, N. Alwadii, N. Ben Nessib, M. Dimitrijević
. The atomic and transition parameters of carbon-like ions are sig-nificant for many important astrophysical researches, such as the modeling of stellar atmospheres, the determination of stellar abundance, the analysis of spectral lines for laboratory plasmas or astronomical objects. In this contri-bution, we calculated the energy levels and lifetimes of the carbon-like vanadium ion (V XVIII) using the atomic structure codes AUTOSTRUCTURE and GRASP2018. Weighted oscillator strengths and transition probabilities are also calculated for the allowed transitions between the energy levels considered. The calculations were carried out for the first 17 configurations: 2s 2 2p 2 , 2p 4 , 2s 2 2p3p, 2s2p 2 3s, 2s2p 2 3d, 2p 3 3p, 2s 2 2p4p, 2s 2 3d 2 , 2s2p 3 , 2s 2 2p3s, 2s 2 2p3d, 2s2p 2 3p, 2p 3 3s, 2p 3 3d, 2s 2 2p4s, 2s 2 2p4d and 2s2p3d 2 .
{"title":"Atomic structure and transition parameters of the V XVIII carbon-like ion","authors":"L. Abu El Maati, M. Ahmad, I. S. Mahmoud, S. Tawfik, N. Alwadii, N. Ben Nessib, M. Dimitrijević","doi":"10.31577/caosp.2022.52.3.44","DOIUrl":"https://doi.org/10.31577/caosp.2022.52.3.44","url":null,"abstract":". The atomic and transition parameters of carbon-like ions are sig-nificant for many important astrophysical researches, such as the modeling of stellar atmospheres, the determination of stellar abundance, the analysis of spectral lines for laboratory plasmas or astronomical objects. In this contri-bution, we calculated the energy levels and lifetimes of the carbon-like vanadium ion (V XVIII) using the atomic structure codes AUTOSTRUCTURE and GRASP2018. Weighted oscillator strengths and transition probabilities are also calculated for the allowed transitions between the energy levels considered. The calculations were carried out for the first 17 configurations: 2s 2 2p 2 , 2p 4 , 2s 2 2p3p, 2s2p 2 3s, 2s2p 2 3d, 2p 3 3p, 2s 2 2p4p, 2s 2 3d 2 , 2s2p 3 , 2s 2 2p3s, 2s 2 2p3d, 2s2p 2 3p, 2p 3 3s, 2p 3 3d, 2s 2 2p4s, 2s 2 2p4d and 2s2p3d 2 .","PeriodicalId":50617,"journal":{"name":"Contributions of the Astronomical Observatory Skalnate Pleso","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47545974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.31577/caosp.2022.52.3.35
Z. Simic, M. Dimitrijević, S. Sahal-Bréchot, N. Sakan
. Stark broadening parameters for four Sn III spectral line obtained by using semiclassical perturbation approach and Stark widths for this transi-tions obtained by using modified semiempirical approach have been compared with available experimental and semiempirical data and used for the consid-eration of the influence of the Stark broadening effect in A type stellar atmospheres.
{"title":"On the Stark broadening parameters of Sn III spectral lines","authors":"Z. Simic, M. Dimitrijević, S. Sahal-Bréchot, N. Sakan","doi":"10.31577/caosp.2022.52.3.35","DOIUrl":"https://doi.org/10.31577/caosp.2022.52.3.35","url":null,"abstract":". Stark broadening parameters for four Sn III spectral line obtained by using semiclassical perturbation approach and Stark widths for this transi-tions obtained by using modified semiempirical approach have been compared with available experimental and semiempirical data and used for the consid-eration of the influence of the Stark broadening effect in A type stellar atmospheres.","PeriodicalId":50617,"journal":{"name":"Contributions of the Astronomical Observatory Skalnate Pleso","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41295071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.31577/caosp.2022.52.3.126
M. Rabasovic, B. Marinković, D. Šević
. The regression analysis of spectra of laser initiated electric discharge spark in atmosphere is presented here. Spectral images of optical emission of atmospheric plasma are obtained by a streak camera and integrated in time to obtain sample spectra of plasma with different apparent temperatures. We already have analyzed such spectra using principal component analysis and classification techniques. Now, we have advanced research through the ANN and deep learning technique. Namely, large set of measured spectra are used to train the artificial neural network to obtain the estimation of apparent plasma temperature. For machine learning approach to data analysis we use Solo+Mia software package (Version 9.0, Eigenvector Research Inc, USA).
本文对大气中激光引发放电火花的光谱进行了回归分析。大气等离子体光学发射的光谱图像由条纹相机获得，并在时间上进行积分，以获得不同表观温度下等离子体的样品光谱。我们已经使用主成分分析和分类技术分析了这些光谱。现在，我们通过人工神经网络和深度学习技术进行了深入的研究。也就是说，使用大量测量光谱来训练人工神经网络，以获得表观等离子体温度的估计。对于数据分析的机器学习方法，我们使用Solo+Mia软件包（9.0版，美国Eigenvector Research Inc）。
{"title":"Analysis of laser induced plasma plume in atmosphere using deep learning","authors":"M. Rabasovic, B. Marinković, D. Šević","doi":"10.31577/caosp.2022.52.3.126","DOIUrl":"https://doi.org/10.31577/caosp.2022.52.3.126","url":null,"abstract":". The regression analysis of spectra of laser initiated electric discharge spark in atmosphere is presented here. Spectral images of optical emission of atmospheric plasma are obtained by a streak camera and integrated in time to obtain sample spectra of plasma with different apparent temperatures. We already have analyzed such spectra using principal component analysis and classification techniques. Now, we have advanced research through the ANN and deep learning technique. Namely, large set of measured spectra are used to train the artificial neural network to obtain the estimation of apparent plasma temperature. For machine learning approach to data analysis we use Solo+Mia software package (Version 9.0, Eigenvector Research Inc, USA).","PeriodicalId":50617,"journal":{"name":"Contributions of the Astronomical Observatory Skalnate Pleso","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44864516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.31577/caosp.2022.52.3.132
A. Nina, V. Čadež, L. Popović, M. Radovanovic
. The hydrogen Ly α radiation emitted from the Sun is the main source of photo-ionization processes and, consequently, of the free electron production in the ionospheric D-region. Variations in the intensity of the incoming Ly α radiation affect changes in the electron density and they show up as periodic daily and seasonal changes, and changes during a solar cycle. The Quiet Ionospheric D-Region (QIonDR) model describes these periodic changes. In this study, we analyse how changes during a year and changes in the smoothed daily sunspot number (both processes affect the intensity of incoming radiation in the D-region) affect the electron density changes related to quiet conditions. The presented modelling is based on the results of the QIonDR model obtained for the part of Europe defined by the positions of the very low frequency (VLF) signal transmitters ICV (Sardinia, Italy) and DHO (Lower Saxony, Germany), and the AWESOME (Atmospheric Weather Electromagnetic System for Ob-servation Modeling and Education) receiver position (Belgrade, Serbia) in application of the QIonDR model on real signals.
{"title":"Influence of variations in the solar hydrogen Lyα radiation on the ionospheric D-region electron density during a year and solar cycle","authors":"A. Nina, V. Čadež, L. Popović, M. Radovanovic","doi":"10.31577/caosp.2022.52.3.132","DOIUrl":"https://doi.org/10.31577/caosp.2022.52.3.132","url":null,"abstract":". The hydrogen Ly α radiation emitted from the Sun is the main source of photo-ionization processes and, consequently, of the free electron production in the ionospheric D-region. Variations in the intensity of the incoming Ly α radiation affect changes in the electron density and they show up as periodic daily and seasonal changes, and changes during a solar cycle. The Quiet Ionospheric D-Region (QIonDR) model describes these periodic changes. In this study, we analyse how changes during a year and changes in the smoothed daily sunspot number (both processes affect the intensity of incoming radiation in the D-region) affect the electron density changes related to quiet conditions. The presented modelling is based on the results of the QIonDR model obtained for the part of Europe defined by the positions of the very low frequency (VLF) signal transmitters ICV (Sardinia, Italy) and DHO (Lower Saxony, Germany), and the AWESOME (Atmospheric Weather Electromagnetic System for Ob-servation Modeling and Education) receiver position (Belgrade, Serbia) in application of the QIonDR model on real signals.","PeriodicalId":50617,"journal":{"name":"Contributions of the Astronomical Observatory Skalnate Pleso","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70010639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.31577/caosp.2022.52.3.105
A. Kolarski, V. Srećković, Z. Mijić
. Solar activity during solar minimum between 23 rd and 24 th solar cycle was inspected, based on solar X-ray radiation listings from Geostationary Operational Environmental Satellite (GOES) database. Periods of quiet solar conditions with low background X radiation are particularly favourable for analysis and exploration of low intensity solar flare events and their effects on lower ionosphere. Low intensity solar flare events were monitored and examined through Very Low Frequency (VLF) radio signals (3-30 kHz), recorded by the use of Absolute Phase and Amplitude Logger system (AbsPAL) operating at the Institute of Physics Belgrade, Serbia. For the purposes of numerical modeling of low ionospheric response to low class solar flare events, the Long Wave Propagation Capability (LWPC) software, based on Wait’s theory, was applied. Main results are presented in this paper.
{"title":"Monitoring solar activity during 23/24 solar cycle minimum through VLF radio signals","authors":"A. Kolarski, V. Srećković, Z. Mijić","doi":"10.31577/caosp.2022.52.3.105","DOIUrl":"https://doi.org/10.31577/caosp.2022.52.3.105","url":null,"abstract":". Solar activity during solar minimum between 23 rd and 24 th solar cycle was inspected, based on solar X-ray radiation listings from Geostationary Operational Environmental Satellite (GOES) database. Periods of quiet solar conditions with low background X radiation are particularly favourable for analysis and exploration of low intensity solar flare events and their effects on lower ionosphere. Low intensity solar flare events were monitored and examined through Very Low Frequency (VLF) radio signals (3-30 kHz), recorded by the use of Absolute Phase and Amplitude Logger system (AbsPAL) operating at the Institute of Physics Belgrade, Serbia. For the purposes of numerical modeling of low ionospheric response to low class solar flare events, the Long Wave Propagation Capability (LWPC) software, based on Wait’s theory, was applied. Main results are presented in this paper.","PeriodicalId":50617,"journal":{"name":"Contributions of the Astronomical Observatory Skalnate Pleso","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47122252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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