Study of Low-latitude Ionospheric Scintillation using NavIC
Sumanjit Chakraborty, Abhirup Datta
备注：
3 pages, 3 figures, accepted for publication as a Young Scientist Award (YSA) Paper at the URSI General Assemble Scientific Symposium (GASS) 2021 Conference (URSI GASS 2021), Rome, Italy
Equatorial ionospheric irregularities have been studied in the past and have produced interesting insights into ionospheric physics and processes. Here, we present the initial results of a long-term study of the ionosphere near the Equatorial Ionization Anomaly (EIA) using Navigation with the Indian Constellation (NavIC). We have characterized the ionospheric irregularities in terms of the power spectral density at different dynamical frequencies. The formalism is similar to as suggested by earlier works using the phase screen modeling of the ionosphere. The observations of the C/N 0 (dB-Hz) variation have been taken by utilizing the L5 (1176.45 MHz) signal of NavIC over Indore located near the northern crest of EIA. We show some initial results as a proof of concept study from a single day (December 4, 2017) of scintillation observations. This is a first-of-its-kind study in this region with NavIC. From the power spectral density analysis, we have demonstrated that NavIC is capable of detecting such irregularities over long periods over this region and has implications for forecasting such events in the future.
Separating Nightside Interplanetary and Ionospheric Scintillation with LOFAR
由于必须使用低射频，电离层引起的闪烁可能会混淆行星际贡献，因此对地球轨道以外的行星际闪烁（IPS）进行观测可能具有挑战性。Kaplan { \it et al}（2015）最近发表的一篇论文介绍了使用Murchison宽场阵列（MWA）进行的观测，报告了在其视场内两个射电源上的夜侧IPS的证据。然而，所使用的2.s的低时间节奏可能会使IPS信号达到平均值，从而导致合理的假设，即闪烁更有可能起源于电离层。为了验证或以其他方式这一假设，这封信使用的IPS的观察，在一个高的时间节奏，使用低频阵列（LOFAR）。将这些平均为与MWA观测相同，我们证明MWA结果与IPS一致，尽管不能排除电离层的一些贡献。这些LOFAR观测代表了第一个使用LOFAR的夜侧IPS，太阳风的速度与一个观测中的缓慢太阳风流一致，而另一个观测中预计会观测到CME。
Influence of ICME-driven Magnetic Cloud-like and Sheath Region induced Geomagnetic Storms in causing anomalous responses of the Low-latitude Ionosphere: A Case Study
