Characterization of SEP events at high heliographic latitudes
Characterization of SEP events at high heliographic latitudes
复制标题
高日照纬度 SEP 事件的特征
DOI：
10.1063/1.1618680
复制
发表时间：
2003
期刊：
影响因子：
2.8
通讯作者：
R. B. Mckibben
中科院分区：
文献类型：
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作者：
S. Dalla;A. Balogh;S. Krucker;A. Posner;R. Müller;J. Anglin;M. Y. Hofer;R. Marsden;T. Sanderson;B. Heber;Ming Zhang;R. B. Mckibben
在2000年2月到2002年5月之间，尤利西斯号宇宙飞船首次在高纬度测量了太阳高能粒子（sep）。在纬度大于45°的地方检测到9个大的渐进SEP事件，它们的特征在高能量粒子（即质子>30 MeV和电子>0.1 MeV）时最为明显。在本文中，我们测量了尤利西斯高纬度事件在几个能量通道中的发生时间，并绘制了它们与逆粒子速度的关系图。我们对Wind和SOHO的近地观测重复这一过程。在地球附近的所有事件以及尤利西斯上的大多数事件中都观察到了速度色散。起始时间与逆速度的关系图可以推导出实验路径的长度和从太阳大气释放的时间。我们发现尤利西斯的路径长度比连接它和太阳的帕克螺旋磁力线的长度长1.2-2.7倍。粒子从太阳释放的时间通常在10…
Between February 2000 and May 2002, the Ulysses spacecraft made the first ever measurements of solar energetic particles (SEPs) at high heliographic latitudes. Nine large gradual SEP events were detected at latitudes greater than 45°, their signatures being clearest at high particle energies, i.e. protons >30 MeV and electrons >0.1 MeV. In this paper we measure the onset times of Ulysses high latitude events in several energy channels, and plot them versus inverse particle speed. We repeat the procedure for near Earth observations by Wind and SOHO. Velocity dispersion is observed in all the events near Earth and in most of them at Ulysses. The plots of onset times versus inverse speed allow to derive an experimental path length and time of release from the solar atmosphere. We find that the derived path lengths at Ulysses are longer than the length of a Parker spiral magnetic field line connecting it to the Sun, by a factor between 1.2–2.7. The time of particle release from the Sun is typically between 10...