Study of ionospheric D region changes during solar flares using MF radar measurements

被引:8
作者
Quan, Lin [1 ]
Cai, Bing [2 ,3 ]
Hu, Xiong [2 ]
Xu, Qingchen [2 ]
Li, Ling [1 ]
机构
[1] Beijing Inst Tracking & Telecommun Technol, Beijing 100094, Peoples R China
[2] Chinese Acad Sci, Natl Space Sci Ctr, Beijing 100190, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
关键词
MF radar; Solar flares; Electron density; ELECTRON-DENSITIES; VLF PHASE; ENHANCEMENTS;
D O I
10.1016/j.asr.2020.10.015
中图分类号
V [航空、航天];
学科分类号
08 ; 0825 ;
摘要
During solar flares, the X-ray radiation suddenly increases, resulting in an increase in the electron density of the atmospheric D region and a strong absorption of short-wave radio waves. Based on Langfang medium frequency (MF) radar, this paper analyzed the variation characteristics of D region in the lower ionosphere from 62 km to 82 km. The analysis focused on multiple C-level and M-level solar flare events before and after the large-scale flare event at 11:53 (UT) on September 6, 2017. The results show that it is difficult to detect the electron density over 70 km in Langfang during solar flares, but the electron density value can be obtained as low as 62 km, and the stronger the flare intensity, the lower the detectable electron density height. Besides, the equal electron density height, the received power of X and O waves will also be significantly reduced during the flares, and the reduction of equal electron density height has a weak linear relationship with flare intensity. (C) 2020 COSPAR. Published by Elsevier Ltd.
引用
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页码:715 / 721
页数:7
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