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What Fraction of the Kinetic Energy of Coronal Mass Ejections goes into Accelerating Solar Energetic Particles?

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.

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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.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Mewaldt, R. A.0000-0003-2178-9111
Cohen, C. M. S.0000-0002-0978-8127
Mason, G. M.0000-0003-2169-9618
Haggerty, D. K.0000-0001-6395-8943
Vourlidas, A.0000-0002-8164-5948
Desai, M. I.0000-0002-7318-6008
Labrador, A. W.0000-0001-9178-5349
Leske, R. A.0000-0002-0156-2414
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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Space Radiation Laboratory2005-16
Record Number:CaltechAUTHORS:20150407-081202469
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56408
Deposited By: Deborah Miles
Deposited On:16 Apr 2015 14:18
Last Modified:09 Mar 2020 13:19

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