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Magnetic field drift shell splitting - Cause of unusual dayside particle pitch angle distributions during storms and substormsThis paper presents a magnetic field drift shell-splitting model for the unusual butterfly and head-and-shoulder energetic (E greater than 25 keV) particle pitch angle distributions (PADs) which appear deep within the dayside magnetosphere during the course of storms and substorms. Drift shell splitting separates the high and low pitch angle particles in nightside injections as they move to the dayside magnetosphere, so that the higher pitch angle particles move radially away from earth. Consequently, butterfly PADs with a surplus of low pitch angle particles form on the inner edge of the injection, but head-and-shoulder PADs with a surplus of high pitch angle particles form on the outer edge. A similar process removes high pitch angle particles from the inner dayside magnetosphere during storms, leaving the remaining lower pitch angle particles to form butterfly PADs on the inner edge of the ring current. A detailed case and statistical study of Charge Composition Explorer/Medium-energy Particle Analyzer observations, as well as a review of previous work, shows most examples of unusual PADs to be consistent with the model.
Document ID
19880035660
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sibeck, D. G.
(Johns Hopkins Univ. Laurel, MD, United States)
Mcentire, R. W.
(Johns Hopkins Univ. Laurel, MD, United States)
Lui, A. T. Y.
(Johns Hopkins Univ. Laurel, MD, United States)
Lopez, R. E.
(Johns Hopkins Univ. Laurel, MD, United States)
Krimigis, S. M.
(Johns Hopkins University Laurel, MD, United States)
Date Acquired
August 13, 2013
Publication Date
December 1, 1987
Publication Information
Publication: Journal of Geophysical Research
Volume: 92
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
88A22887
Funding Number(s)
CONTRACT_GRANT: NASA TASK 1
CONTRACT_GRANT: N00039-87-C-5301
Distribution Limits
Public
Copyright
Other

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