Banded electron structures in the plasmasphere
Banded electron structures in the plasmasphere
复制标题
等离子体层中的带状电子结构
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
E. Holeman
中科院分区：
文献类型：
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作者：
W. J. Burke;A. Rubin;D. Hardy;E. Holeman
CRRES上的低能等离子体分析器已经探测到捕获在等离子体层场线上的10 eV到30 keV电子的大量通量。在能量-时间光谱图上，这些电子表现为带状结构，跨度可达250千伏到20千伏。在接下来的两天里，在交替的CRRES轨道上与低能云的相遇表明，电子的内部边界逐渐地向地球移动。惠斯勒和电子回旋加速器的谐波发射伴随着云电子最强烈的表现。对这些测量结果最简单的解释是，在最初的注入之后，阿尔芬边界向外移动，使云电子处于封闭的漂移路径上。随后，对流电场的波动穿透了等离子体层，将云元素向内输送。其中一种带状结构中电子温度的磁壳层分布表明，辐射能量损失在大小上可能与绝热压缩的增益相当。
The low-energy plasma analyzer on CRRES has detected significant fluxes of 10-eV to 30-keV electrons trapped on plasmaspheric field lines. On energy-versus-time spectrograms these electrons appear as banded structures that can span the 2 50 to <20 kV. Subsequent encounters with the lower-energy cloud on alternating CRRES orbits over the next 2 days showed a progressive, earthward movement of the electrons’ inner boundary. Whistler and electron cyclotron harmonic emissions accompanied the most intense manifestations of cloud electrons. The simplest explanation of these measurements is that after initial injection, the Alfven boundary moved outward, leaving the cloud electrons on closed drift paths. Subsequent fluctuations of the convective electric field penetrated the plasmasphere, transporting cloud elements inward. The magnetic shell distribution of electron temperatures in one of the banded structures suggests that radiative energy losses may be comparable in magnitude to gains due to adiabatic compression.