Abstract

An experiment on radio sounding of the circumsolar plasma by signals from the Mars Express spacecraft in 2013 was carried out in the period from March 4 through May 31. The investigated characteristics were the frequency of signals in the centimeter and decimeter ranges and the differential frequency. A number of events were recorded in which the intensity of the frequency fluctuations of the signals probing the plasma was several times higher than the background values. As shown by the analysis of observations of solar activity, such as an increase in the flux of X-rays and SOHO LASCO coronagraph data, this is explained by the passage of disturbed plasma streams generated in the solar corona through the spacecraft radio communication path with the Earth. The comparison of the radio transmission data with the results of measurements of the parameters of the near-Earth plasma using the Wind spacecraft in adjacent periods of time. As a result of the analysis of the data on the proton concentration, it became clear that sharp increases in both the average values and fluctuations of this characteristic were also observed near the Earth. The time lag between the events observed in the circumsolar and near-Earth plasma shows that the cause of the disturbances is the increased activity of the same coronal region rotating with the Sun.

中文翻译：

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利用无线电测深和局部测量观测太阳和近地空间环境中受干扰的等离子体结构

摘要

在3月4日至5月31日期间，进行了2013年火星快车航天器发出的信号对绕周等离子体的无线电探测实验。研究的特征是厘米和分米范围内的信号频率以及差分频率。记录了许多事件，其中探测等离子体的信号的频率波动的强度是背景值的几倍。如对太阳活动观测的分析所示，例如X射线和SOHO的通量增加LASCO日冕仪数据，这是通过太阳电晕中产生的受干扰等离子体流通过航天器与地球的无线电通信路径来解释的。将无线电传输数据与使用风飞船在相邻时间段内对近地等离子体的参数测量结果进行比较。作为对质子浓度数据分析的结果，很明显，在地球附近也观察到了该特性的平均值和波动的急剧增加。在外周等离子体和近地等离子体中观测到的事件之间的时间间隔表明，干扰的原因是与太阳一起旋转的同一日冕区域活动的增加。