An updated catalog of IPS radio sources observed by MEXART at 140 MHz for space weather studies

IF 1.8 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Atmospheric and Solar-Terrestrial Physics Pub Date : 2024-03-19 DOI:10.1016/j.jastp.2024.106208

G. Baron , E. Aguilar-Rodriguez , J.C. Mejia-Ambriz , O. Chang , J.A. Gonzalez-Esparza , P. Villanueva , E. Andrade

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Abstract

The Mexican Array Radio Telescope (MEXART) is an instrument dedicated to performing interplanetary scintillation (IPS) observations at 140 MHz. After the MEXART backend’s digitization, the array’s technical capabilities have improved substantially, and we observe new IPS sources. By analyzing observations recorded from June 2020 to June 2022, we present an updated catalog of radio sources observed with an IPS signature by MEXART. First, we implemented an algorithm to treat the noise presented by some channels in the frequency. Next, we obtained the spectra of the observations to get the frequency of the Fresnel’s knee and determine whether each radio source exhibited IPS. We then estimated the source’s flux at 140 MHz by interpolating flux density data to different frequencies using the NASA/IPAC Extragalactic Database. Finally, we present a list of 38 radio sources showing IPS signatures. The source list presents declination, right ascension, and flux at 140 MHz. This updated catalog will allow studies of solar wind properties in the inner heliosphere using MEXART data.

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用于空间天气研究的 MEXART 在 140 MHz 观测到的 IPS 射电源更新目录

墨西哥阵列射电望远镜（MEXART）是一台专门在 140 MHz 频率上进行行星际闪烁（IPS）观测的仪器。墨西哥阵列射电望远镜后端数字化后，阵列的技术能力有了大幅提高，我们也观测到了新的行星际闪烁源。通过分析2020年6月至2022年6月的观测记录，我们提出了MEXART观测到的具有IPS特征的射电源的最新目录。首先，我们采用了一种算法来处理频率中某些信道产生的噪声。接着，我们获取了观测数据的光谱，以获得菲涅尔膝的频率，并确定每个射电源是否表现出 IPS。然后，我们利用 NASA/IPAC 河外星系数据库，将通量密度数据插值到不同频率，从而估算出射电源在 140 MHz 频率上的通量。最后，我们列出了 38 个显示 IPS 特征的射电源。该射电源列表显示了偏角、赤经和 140 MHz 的通量。更新后的目录将有助于利用 MEXART 数据研究内日光层的太阳风特性。

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来源期刊

Journal of Atmospheric and Solar-Terrestrial Physics 地学-地球化学与地球物理

CiteScore

4.10

自引率

5.30%

发文量

审稿时长

6 months

期刊介绍： The Journal of Atmospheric and Solar-Terrestrial Physics (JASTP) is an international journal concerned with the inter-disciplinary science of the Earth''s atmospheric and space environment, especially the highly varied and highly variable physical phenomena that occur in this natural laboratory and the processes that couple them. The journal covers the physical processes operating in the troposphere, stratosphere, mesosphere, thermosphere, ionosphere, magnetosphere, the Sun, interplanetary medium, and heliosphere. Phenomena occurring in other "spheres", solar influences on climate, and supporting laboratory measurements are also considered. The journal deals especially with the coupling between the different regions. Solar flares, coronal mass ejections, and other energetic events on the Sun create interesting and important perturbations in the near-Earth space environment. The physics of such "space weather" is central to the Journal of Atmospheric and Solar-Terrestrial Physics and the journal welcomes papers that lead in the direction of a predictive understanding of the coupled system. Regarding the upper atmosphere, the subjects of aeronomy, geomagnetism and geoelectricity, auroral phenomena, radio wave propagation, and plasma instabilities, are examples within the broad field of solar-terrestrial physics which emphasise the energy exchange between the solar wind, the magnetospheric and ionospheric plasmas, and the neutral gas. In the lower atmosphere, topics covered range from mesoscale to global scale dynamics, to atmospheric electricity, lightning and its effects, and to anthropogenic changes.