Mewaldt, R. A. and Cohen, C. M. S. and Mason, G. M. and Haggerty, D. K. and Looper, M. D. and Vourlidas, A. and Desai, M. I. and Giacalone, J. and Labrador, A. W. and Leske, R. A. and Mazur, J. E. (2005) What Fraction of the Kinetic Energy of Coronal Mass Ejections goes into Accelerating Solar Energetic Particles? In: Proceedings of the 29th International Cosmic Ray Conference. Vol.1. Tata Institute of Fundamental Research , Pune, India, pp. 129-132. https://resolver.caltech.edu/CaltechAUTHORS:20150407-081202469
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Abstract
The largest solar energetic particle (SEP) events are thought to be accelerated by shocks driven by fast coronal mass ejections (CMEs). We compare measurements of the energy content of large SEP events from 1998 to 2003 to the kinetic energy of the associated CMEs to study the efficiency of this process. Using CME data from SOHO and SEP data from ACE, SAMPEX, and GOES for a total of 17 events, we find that the ratio of the SEP to CME kinetic energies ranges from-0.1% to-20%, with the largest SEP events giving an average SEP/CME kinetic-energy ratio of -10%. Evidently shock acceleration is a relatively efficient process in these events. It is interesting that a similar efficiency is derived for cosmic-ray acceleration by supernova shocks.
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Additional Information: | Copyright TATA Institute of Fundamental Research Thia work was supported by NASA under grant NNG04GBS5G, NN004088G, and NAGS-12929. | ||||||||||||||||||
Group: | Space Radiation Laboratory | ||||||||||||||||||
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Record Number: | CaltechAUTHORS:20150407-081202469 | ||||||||||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20150407-081202469 | ||||||||||||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||||
ID Code: | 56408 | ||||||||||||||||||
Collection: | CaltechAUTHORS | ||||||||||||||||||
Deposited By: | Deborah Miles | ||||||||||||||||||
Deposited On: | 16 Apr 2015 14:18 | ||||||||||||||||||
Last Modified: | 09 Mar 2020 13:19 |
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