ROSES ID: NNH06ZDA001N Selection Year: 2007
Program Element: Focused Science Topic
Principal Investigator: Glenn Mason
Affiliation(s): JHU / APL
Project Member(s):
Mewaldt, Richard A. Co-I California Institute of Tech
Desai, Mihir I Co-I Southwest Research Institute
Zank, Gary P Collaborator University of Alabama
Li, Gang Co-I gang.li@uah.edu null 256-961-7311
Haggerty, Dennis K Co-I dennis.haggerty@jhuapl.edu The Johns Hopkins University Applied Physics Laboraotry 240-228-7886
Cohen, Christina M. S. Co-I cohen@srl.caltech.edu California Institute of Technology 626-395-6614
Leske, Richard A. Collaborator ral@srl.caltech.edu California Institute of Technology 626-395-8400
Summary:
Solar Energetic Particle (SEP) events are the most powerful explosions in the solar system, able to create high radiation levels at Earth with little warning. In the large events, particles are known to be accelerated both in the solar flare itself and by the shock driven by the associated Coronal Mass-Ejection (CME). The flare SEPs are known to have a distinct compositional signature including enhancements in electrons, the rare isotope 3He, and the relative abundance of Fe compared to O. Recent observations have shown that these energetic particle signatures of flare particles are often present in events with powerful CMEs along with shock-accelerated particles. This raises the question what are the basic mechanisms responsible for the most intense SEP events? For example: are the SEPs from the flare directly? or are they pre-accelerated at the flare and further energized by the shock? or are remnant suprathermals from previous flares supplying a critical component of the seed population?Performance Year | Reference | Actions |
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1 | Gómez-Herrero, R.; Dresing, N.; Malandraki, O.; Klass... | |
1 | Wiedenbeck, M. E.; Cohen, C. M.; Cummings, A. C.; G... |