How efficient are coronal mass ejections at accelerating solar energetic particles?

R. A. Mewaldt, C. M.S. Cohen, J. Giacalone, G. M. Mason, E. E. Chollet, M. I. Desai, D. K. Haggerty, M. D. Looper, R. S. Selesnick, A. Vourlidas

Research output: Chapter in Book/Report/Conference proceedingConference contribution

30 Scopus citations

Abstract

The largest solar energetic particle (SEP) events are thought to be due to particle acceleration at a shock driven by a fast coronal mass ejection (CME). We investigate the efficiency of this process by comparing the total energy content of energetic particles with the kinetic energy of the associated CMEs. The energy content of 23 large SEP events from 1998 through 2003 is estimated based on data from ACE, GOES, and SAMPEX, and interpreted using the results of particle transport simulations and inferred longitude distributions. CME data for these events are obtained from SOHO. When compared to the estimated kinetic energy of the associated coronal mass ejections (CMEs), it is found that large SEP events can extract ∼10% or more of the CME kinetic energy. The largest SEP events appear to require massive, very energetic CMEs.

Original languageEnglish (US)
Title of host publicationParticle Acceleration and Transport in the Heliosphere and Beyond - 7th Annual International Astrophysics Conference
Pages111-117
Number of pages7
DOIs
StatePublished - 2008
Event7th Annual International Astrophysics Conference on Particle Acceleration and Transport in the Heliosphere and Beyond - Kauai, HI, United States
Duration: Mar 7 2008Mar 13 2008

Publication series

NameAIP Conference Proceedings
Volume1039
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other7th Annual International Astrophysics Conference on Particle Acceleration and Transport in the Heliosphere and Beyond
CountryUnited States
CityKauai, HI
Period3/7/083/13/08

Keywords

  • CMEs
  • Particle acceleration
  • Solar energetic particles

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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