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Interplanetary ions during an energetic storm particle event - The distribution function from solar wind thermal energies to 1.6 MeVAn ion velocity distribution function of the postshock phase of an energetic storm particle (ESP) event is obtained from data from the ISEE 2 and ISEE 3 experiments. The distribution function is roughly isotropic in the solar wind frame from solar wind thermal energies to 1.6 MeV. The ESP event studied (8/27/78) is superposed upon a more energetic particle event which was predominantly field-aligned and which was probably of solar origin. The observations suggest that the ESP population is accelerated directly out of the solar wind thermal population or its quiescent suprathermal tail by a stochastic process associated with shock wave disturbance. The acceleration mechanism is sufficiently efficient so that approximately 1% of the solar wind population is accelerated to suprathermal energies. These suprathermal particles have an energy density of approximately 290 eV cubic centimeters.
Document ID
19810040177
Document Type
Reprint (Version printed in journal)
Authors
Gosling, J. T. (Los Alamos Scientific Lab. NM, United States)
Asbridge, J. R. (Los Alamos Scientific Lab. NM, United States)
Bame, S. J. (Los Alamos Scientific Lab. NM, United States)
Feldman, W. C. (Los Alamos Scientific Lab. NM, United States)
Zwickl, R. D. (California, University Los Alamos Scientific Laboratory, Los Alamos, N. Mex., United States)
Paschmann, G. (Los Alamos Scientific Lab. NM, United States)
Sckopke, N. (Max-Planck-Institut fuer Physik und Astrophysik Garching, Germany)
Hynds, R. J. (Imperial College of Science and Technology London, United Kingdom)
Date Acquired
August 11, 2013
Publication Date
February 1, 1981
Publication Information
Publication: Journal of Geophysical Research
Volume: 86
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: BMFT-01-OI-027-ZA/WF/WRK-275
CONTRACT_GRANT: NASA ORDER S-50864-A
Distribution Limits
Public
Copyright
Other