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A lower limit to the altitude of coronal particle storage regions deduced from solar proton energy spectraThe spectrum of low energy protons observed at 1 AU following solar flares shows little or no evidence of energy degradation down to approximately 0.3 MeV. Such observations may be used to set a lower limit on the altitude of hypothetical coronal particle storage regions, ranging from 2 to 7 R sub s. It is pointed out that closed coronal magnetic loop structures are observed to extend to 2R sub s, so that long-term storage of low energy protons does not take place in the immediate vicinity of the sun. It is further suggested that in the few cases where the proton spectrum appears to be degraded at low energies, the energy loss may be due to adiabatic deceleration in the expanding solar wind. The alternative of continual acceleration is suggested as a plausible substitute for the particle storage hypothesis.
Document ID
19740013362
Document Type
Conference Paper
Authors
Krimigis, S. M. (Johns Hopkins Univ. Laurel, MD, United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1973
Publication Information
Publication: NASA, Washington High Energy Phenomena on the Sun
Subject Category
PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
Funding Number(s)
CONTRACT_GRANT: N00017-72-C-4401
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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