Formation of negative disturbances in the topside ionosphere during solar flares

L. A. Leonovich, A. Taschilin
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引用次数: 1

Abstract

[1] The results of studies of the ionospheric response to solar flares are presented. The results are based on the observations of GPS signals and at incoherent scatter radars and on theoretical calculations. Analyzing the GPS data, the method based on a partial “shadowing” of the atmosphere by the Earth was used. This method made it possible to estimate the value of the electron content variations in the topside ionosphere during the solar flare on 14 July 2000. We obtained that according to the GPS data at altitudes of the topside ionosphere (h > 300 km) a flare is able to cause a decrease of the electron content. Similar eects of formation of a negative disturbance in the ionospheric region were observed also during the solar flares on 21 and 23 May 1967 by the Arecibo radar. Using the theoretical model of ionosphere‐plasmasphere interaction, we study in this paper the mechanism of formation of negative disturbances in the topside ionosphere during solar flares. It is shown that the intense transport of O + ions into the above-situated plasma caused by a sharp increase in the ion production rate and thermal expansion of the ionospheric plasma is a cause of the formation of the negative disturbance in the electron concentration in the topside ionosphere. INDEX TERMS: 2481 Ionosphere: Topside ionosphere; 2435 Ionosphere: Ionospheric disturbances; 2467 Ionosphere: Plasma temperature and density; KEYWORDS: Electron content variations; solar flare; GPS receivers network; Arecibo IS installation.
太阳耀斑期间上层电离层负扰动的形成
本文介绍了电离层对太阳耀斑响应的研究结果。结果是基于对GPS信号和非相干散射雷达的观测和理论计算得出的。在分析GPS数据时,采用了基于地球对大气部分“遮蔽”的方法。利用这种方法可以估计2000年7月14日太阳耀斑期间上层电离层电子含量的变化值。根据GPS在上层电离层高度(h > 300 km)的数据,我们得出耀斑能够引起电子含量的降低。在1967年5月21日和23日的太阳耀斑期间,阿雷西博雷达也观察到电离层区域形成负扰动的类似现象。本文利用电离层-等离子层相互作用的理论模型,研究了太阳耀斑期间上层电离层负扰动的形成机制。结果表明,电离层等离子体产生离子速率的急剧增加和热膨胀引起的O +离子向上述等离子体的强烈输运是电离层上部电子浓度负扰动形成的原因之一。索引项:2481电离层:上层电离层;2435电离层:电离层扰动;2467电离层:等离子体温度和密度;关键词:电子含量变化;太阳耀斑;GPS接收机网络;Arecibo IS安装。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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