Upstream hydromagnetic waves and their association with backstreaming ion populations: ISEE 1 and 2 observations
Upstream hydromagnetic waves and their association with backstreaming ion populations: ISEE 1 and 2 observations
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DOI：
10.1029/ja086ia06p04471
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发表时间：
1981-06
影响因子：
--
通讯作者：
M. Hoppe;C. Russell;L. Frank;T. Eastman;E. Greenstadt
中科院分区：
文献类型：
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作者：
M. Hoppe;C. Russell;L. Frank;T. Eastman;E. Greenstadt
从Lepedea等离子体仪器和通量门磁强计上ISEE 1和2的测量被用来检查与从地球的弓形激波回流的各种类型的离子相关的磁流体波的性质。被限制在窄的能量和角度范围内的反射离子伴随着小的振幅（<或大约<100 Hz）。=1/2..伽马..峰到峰）在航天器帧中频率接近1 Hz的左手波。具有宽能谱的扩散回流粒子与低频率（约100 Hz）相关联。30-s周期）大振幅（约5..伽马..峰到峰）波。中间粒子与这两种波型的混合有关。通常，与漫射光束相关的波会变陡，就好像它们是微型冲击。前缘（航天器坐标系中的后缘）经常出现分裂成哨声模式波包。这些离散的波包是右旋极化的，在等离子体框架中，其频率从低于质子回旋频率到远高于质子回旋频率，并被太阳风吹回地球。
Measurements from the Lepedea plasma instruments and the flux gate magnetometers on ISEE 1 and 2 are used to examine the nature of the hydromagnetic waves associated with the various classes of ions backstreaming from the earth's bow shock. The reflected ions, which are confined to a narrow energy and angular range, are accompanied by a small amplitude (< or approx. =1/2..gamma.. peak to peak) left-handed waves at frequencies close to 1 Hz in the spacecraft frame. Diffuse backstreaming particles with a broad energy spectrum are associated with low frequency (approx. 30-s period) large amplitude (approx.5 ..gamma.. peak to peak) waves. Intermediate particles are associated with a mixture of these two wave types. Often the waves associated with the diffuse beams steepen as if they were mini shocks. The leading edge (trailing edge in the spacecraft frame) frequently appears to break up into a whistler mode wave packet. These discrete wave packets are right-hand polarized and have frequencies from below the proton gyrofrequency to well above it in the plasma frame and are blown back towards the earth by the solar wind.