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Paper: 3He-rich Events During the Rising Phase of Solar Cycle 24
Volume: 484, Outstanding Problems in Heliophysics: From Coronal Heating to the Edge of the Heliosphere
Page: 72
Authors: Ho, G. C.; Mason, G. M.
Abstract: We investigated 3He-rich solar energetic particle (SEP) events in the current solar cycle starting in 2009 through the end of 2012. Both impulsive (flare-related) 3He-rich and CME-related gradual events are included. During the last solar cycle, we found an unexpected upper limit of the 3He fluence, while none is observed for 4He. One of the interpretations is that only limited number of energetic 3He ions can be released from the Sun in a SEP event since the 3He originates in compact regions. Thus, the upper limit on the 3He fluence that we observed may be giving us information on the maximum size of the 3He acceleration region. In this paper, we will review the 3He observations so far in this solar cycle and reexamine the limit of 3He fluence.
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