Plasma Conditions in the Polar Ionosphere Observed in SPW Experiments of PPS System on Board the Ohzora (EXOS-C) Satellite

Plasma Conditions in the Polar Ionosphere Observed in SPW Experiments of PPS System on Board the Ohzora (EXOS-C) Satellite
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Ohzora (EXOS-C) 卫星上 PPS 系统 SPW 实验观测到的极地电离层等离子体条件

DOI：
10.5636/jgg.37.285
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
H. Oya
H. Oya
中科院分区：
--
文献类型：
--
作者：
T. Obara;H. Oya

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对搭载在“曙光号”（EXOS - C）卫星上的行星等离子体探测器（PPS）所获取的受激等离子体波实验（SPW）数据进行了最初三个月的分析。从SPW实验的电离图中，1）获得了顶部电离层的垂直剖面，2）获得了等离子体分布的不规则性，3）识别了自然发射的等离子体波的模式。对这些主题的研究得出了以下结果。 （i）在极区电离层中，极光粒子沉降甚至在卫星高度都会产生强烈的等离子体波。 （ii）与粒子沉降导致的强烈等离子体波的产生相关联，顶部电离层中存在等离子体分布的不规则性，这成为对发射的射频脉冲产生散射效应的根源。 （iii）由于极光区域极光粒子沉降增强，电子密度增大。同时，电子温度升高所表明的显著热输入也得到了证实。 （iv）在比极光区域纬度更低的极光带附近，也存在一个热输入比极光区域情况更温和的区域。 （v）输入到极光带的大量能量引发了一种以行波电离层扰动（TID）形式在极盖电离层中传播的相对大规模的扰动。
The data of the stimulated plasma wave experiments (SPW) obtained from the planetary plasma sounder (PPS) aboard the Ohzora (EXOS-C) satellite have been analyzed for the initial three months. From the ionograms of SPW experiments 1) vertical profiles of the topside ionosphere, 2) irregularity of the plasma distribution and 3) identification of the modes of the naturally emitted plasma waves have been obtained. The studies on these subjects lead to the following results.(i) In the polar region ionosphere, the auroral particle precipitations generate the intense plasma waves even in the satellite level.(ii) Associated with the generations of the intense plasma waves caused by the particle precipitation, there are irregularities of the plasma distribution in the topside ionosphere which become the origin of the scattering effects on the transmitted RF pulses.(iii) Enhancement of the electron density takes place caused by the enhanced precipitation of the auroral particles in the auroral region. At the same time remarkable heat input which is indicated by increasing of the electron temperature is also confirmed.(iv) Near the auroral zone in the lower latitude side than the auroral regions, there is also the region where the heat input is taking place in milder manner than the case of the auroral regions.(v) Large energy input into the auroral zone triggers a relatively large scale disturbance propagating in the polar cap ionosphere in the form of the traveling ionospheric disturbance (TID).