Whistler Scattering of Suprathermal Electrons in the Solar Wind: ACE Observations
Whistler Scattering of Suprathermal Electrons in the Solar Wind: ACE Observations
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太阳风中超热电子的惠斯勒散射：ACE 观测
DOI：
10.1029/2006ja011967
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发表时间：
2007
影响因子：
--
通讯作者：
J. Steinberg
中科院分区：
文献类型：
--
作者：
C. Pagel;S. Gary;C. Dekoning;R. Skoug;J. Steinberg
[1]太阳风中的超热电子具有各向异性速度分布的Strahl分量，该分量沿远离太阳的背景磁场定向。本文报告了用ACE航天器上的SWEPAM等离子体测量仪在2004年测量到的73.3 eV到987 eV的Strahl分布。这份手稿描述了29个事件，它们对应于Strahl俯仰角分布的时间，这些时间比以前或后来观察到的时间更宽，并且在低于或类似于3赫兹的频率下增强了磁场波动。虽然大多数先前报道的能量高达几百eV的观测表明，Strahl俯仰角宽度随着能量的增加而减少，但在这里报告的29个事件中，这一宽度平均随着Strahl能量的增加而增加。这份手稿还提出了一个假设，即这一特征是由于宽带哨声涨落引起的电子散射。
[ 1] Suprathermal electrons in the solar wind have a strahl component with anisotropic velocity distributions which are directed along the background magnetic field away from the Sun. Analyses of strahl distributions from 73.3 eV to 987 eV as measured during the year 2004 by the SWEPAM plasma instrument on the ACE spacecraft are reported here. This manuscript describes 29 events which correspond to times of strahl pitch-angle distributions which are broader than those observed at earlier or later times and enhanced magnetic field fluctuations at frequencies less than or similar to 3 Hz. Although most previously reported observations at energies up to a few hundred eV show that strahl pitch-angle widths decrease with increasing energy, during the 29 events reported here, this width increased on average as strahl energy increased. This manuscript also develops the hypothesis that this characteristic is due to electron scattering by broadband whistler fluctuations.