The Dependence of Solar Energetic Particle Fluences on Suprathermal Seed-Particle Densities

被引：19
作者：
Mewaldt, R. A. [1 ]
Mason, G. M. [2 ]
Cohen, C. M. S. [1 ]
机构：
[1] CALTECH, Mail Code 290-17, Pasadena, CA 91125 USA
[2] Johns Hopkins Appl Phys Lab, Laurel, MD 20723 USA
来源：
SPACE WEATHER: THE SPACE RADIATION ENVIRONMENT | 2012年 / 1500卷
关键词：
Solar energetic particles; solar wind; energetic particle acceleration; coronal mass ejections; ISOTOPE SPECTROMETER; EVENTS; PROTON; ACCELERATION; ABUNDANCES; DIFFUSION;
D O I：
10.1063/1.4768755
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Measurements during solar cycle 23 showed that most solar energetic particles (SEPs) are accelerated from a seed-population of suprathermal ions (e. g., >10 keV/nuc) rather than from the bulk solar wind. In this case the SEP fluence should depend on the pre-existing density of suprathermal ions. Lacking near-Sun measurements of suprathermal ion densities we have used ACE/ULEIS daily-average densities of suprathermal Fe at 1 AU during 1998-2005 as a proxy. We find that the maximum Fe daily-average SEP fluences measured by ACE/SIS are apparently limited by the pre-existing suprathermal number density. Similarly, large fluences of Fe in solar energetic particle events only occurred when there was a pre-existing high density of suprathermal Fe. We conclude that in situ suprathermal ion data can play a key role in estimating the probability of large SEP events, or in forecasting all-clear periods.
引用
收藏
页码：128 / 133
页数：6
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