Characteristics of wave‐particle interactions during sudden commencements: 2. Spacecraft observations
Characteristics of wave‐particle interactions during sudden commencements: 2. Spacecraft observations
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突然开始时波粒相互作用的特征：2. 航天器观测
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
U. Inan
中科院分区：
文献类型：
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作者：
W. Gail;U. Inan
对DE 1航天器50次突然开始的波数据进行了幅度和频谱修改分析，并与地面观测站的数据进行了关联。波活动的变化被确定在14个事件的研究。这些变化通常在低于当地电子回旋频率的频率下观察到，在频率和时间上都表现出复杂的结构，并且在事件之间变化很大。典型事件持续1-10分钟，最大窄带振幅增加或减少10-30 dB。波增长的起始时间与磁扰动到达航天器相关。在3 < L < 6的范围内，在L壳处观察到的变化最常见。增长被观察到的夜侧以及昼侧，并没有明确的当地时间dependencyfound. In几种情况下，增长的频率高于当地的陀螺频率被指出，并确定为极光公里辐射。
Wave data from the DE 1 spacecraft for 50 sudden commencements were analyzed for amplitude and spectral modifications and correlated with data from ground-based observatories. Changes in wave activity were identified in 14 of the events studied. The changes, which were commonly observed at frequencies below the local electron gyrofrequency, exhibited a complex structure both in frequency and in time and varied considerably among events. The typical event lasted 1–10 min with a maximum narrowband amplitude increase or decrease of 10–30 dB. The onset time of the wave growth was correlated with the arrival of the magnetic disturbance at the spacecraft. Changes were most commonly observed at L shells in the range 3 < L < 6. Growth was observed on the nightside as well as the dayside, and no clear local time dependence was found. In several cases, growth at frequencies above the local gyrofrequency was noted and identified as auroral kilometric radiation.