Solar Energetic Particle Characteristics and Their Dependence on Longitude in Solar Cycle 24

被引:5
|
作者
Cohen, C. M. S. [1 ]
Mason, G. M.
Mewaldt, R. A. [1 ]
von Rosenvinge, T. T.
机构
[1] CALTECH, Pasadena, CA 91125 USA
来源
PROCEEDINGS OF THE THIRTEENTH INTERNATIONAL SOLAR WIND CONFERENCE (SOLAR WIND 13) | 2013年 / 1539卷
关键词
Solar energetic particles; SEP composition; SEP spectra; ISOTOPE SPECTROMETER; TELESCOPE;
D O I
10.1063/1.4811010
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
In previous solar cycles, most studies examining the longitude dependence of solar energetic particle (SEP) event characteristics (such as composition and spectral hardness) have involved statistical analysis of single-point measurements. With the significant separation between the two STEREO and near-Earth spacecraft during solar cycle 24, these SEP characteristics can be examined simultaneously from multiple vantage points. Using SEP measurements from sensors on STEREO and ACE, we have examined the longitude dependence of the Fe/O abundance ratio at 10 MeV/nuc and the oxygen spectral index for energies above 10 MeV/nuc. Longitudinal patterns were sought that support or refute the scenarios put forth by Tylka et al. and Cane et al. to explain the Fe-enriched large SEP events of cycle 23. Unfortunately few Fe-enriched events have occurred in cycle 24 and their longitudinal behavior is not entirely consistent with either of the proposed scenarios.
引用
收藏
页码:151 / 154
页数:4
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