Injection and loss of inner radiation belt protons during solar proton events and magnetic storms
Injection and loss of inner radiation belt protons during solar proton events and magnetic storms
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DOI：
10.1029/2010ja015247
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发表时间：
2010-08
影响因子：
--
通讯作者：
R. Selesnick;M. Hudson;B. Kress
中科院分区：
文献类型：
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作者：
R. Selesnick;M. Hudson;B. Kress
[1]对HEO-3卫星1998年至2005年间27至45兆电子伏质子测量值进行了调查，以描述内辐射带和槽区（L = 2至3）外部的变化。快速（~ 1天）变化被描述为注入或损失事件，分别以高斯或指数L依赖关系表征。这两种事件类型的径向范围与相关磁暴的最小Dst有关，而注入量级与相关的行星际太阳质子事件的通量有关。观测到的捕获质子的最大L的变化与从磁力线曲率估计的捕获极限一致。观测到的损耗事件的向内程度和能量无关性与静态磁场中场线曲率引起的散射不一致。然而，在磁暴期间观测到的时变地磁截止抑制可能是造成重大损失的原因。快速磁层压缩引起的电场脉冲漂移共振可能是太阳质子注入和先前存在的捕获质子径向位移的原因。
[1] A survey of 27 to 45 MeV proton measurements from the HEO-3 satellite during the years 1998 through 2005 has been taken to describe variability in the outer part of the inner radiation belt and slot region (L = 2 to 3). Rapid (∼1-day) changes are described as injection or loss events, characterized respectively by Gaussian or exponential L dependencies. The radial extent of both event types is correlated to the minimum Dst of associated magnetic storms, while the injection magnitude is correlated to the flux of associated interplanetary solar proton events. Changes in the maximal L of observed trapped protons are consistent with trapping limits estimated from magnetic field line curvature. The inward extent and energy independence of the observed loss events are inconsistent with field line curvature induced scattering in a static magnetic field. However, time-dependent geomagnetic cutoff suppression, observed during magnetic storms, may be the cause of significant losses. Drift resonance with electric field impulses caused by rapid magnetospheric compression is the likely cause of both solar proton injections and radial shifts of preexisting trapped protons.