Electron modulation and ion cyclotron waves observed by FAST
Electron modulation and ion cyclotron waves observed by FAST
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FAST 观测到的电子调制和离子回旋波
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
R. Pfaff
中科院分区：
文献类型：
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作者：
J. Mcfadden;C. Carlson;R. Ergun;C. Chaston;F. Mozer;M. Temerin;D. Klumpar;E. Shelley;W.K. (Bill) Peterson;E. Moebius;L. Kistler;R. Elphic;R. Strangeway;C. Cattell;R. Pfaff
FAST卫星的新观测表明，倒V弧中高能电子与H+ EMIC波之间存在强烈的波粒相互作用。强烈的波被证明发生在强向上的电流区域，其中包含强烈的下行场对准的电子通量。在倒V谱峰附近的电子在波频或波频附近具有2到10倍的大相干通量调制。电子调制通常集中在约fCH+/2处，其中fCH+是局部H+回旋频率。EMIC波是宽带的，从大约0.3fCH+延伸到0.7fCH+。这些波也加速冷的二次电子，形成能量高达约300 eV的逆流场对准电子。此外，在fCH+的电子调制中观察到的密度腔与上行离子束。强烈的波在fCH+同时检测到，并显示有一个类似的EMIC波的磁分量。
New observations from the FAST satellite demonstrate strong wave‐particle interactions between energetic electrons and H+ EMIC waves in inverted‐V arcs. The intense waves are shown to occur in strong upward current regions which contain intense downgoing field‐aligned electron fluxes. Electrons near the inverted‐V spectral peak have large, factor of 2 to 10, coherent flux modulations at or near the wave frequency. The electron modulations are typically centered at about fCH+/2 where fCH+ is the local H+ cyclotron frequency. The EMIC waves are broadbanded, extending from about 0.3fCH+ to 0.7fCH+. These waves also accelerate cold secondary electrons, forming counterstreaming field‐aligned electrons at energies up to about 300 eV. In addition, electron modulations at fCH+ are observed in the density cavities associated with upgoing ion beams. Intense waves at fCH+ are simultaneously detected and shown to have a magnetic component similar to the EMIC waves.