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Predictions of lithium interactions with earth's bow shock in the presence of wave activityThe results of a test-particle simulation studying the movement of a lithium tracer ion injected upstream of the bow shock are reported. Wave activity consists of parallel and antiparallel propagating Alfven waves characterized by a frequency power spectrum within a frequency or range of amplitudes defined separately in the upstream and downstream regions. The results show that even a moderate level of wave activity can substantially change the results obtained in the absence of waves. Among the effects observed are: (1) increased ion transmission; (2) both the average energy gain and spread about the average are increased for transmitted and reflected particles; (3) the average final pitch angle for transmitted particles tends to 90 deg, and the spread of reflected particles is reduced; and (4) the spatial dispersion of the ions on the bow shock after a single encounter is increased.
Document ID
19840065465
Document Type
Reprint (Version printed in journal)
Authors
Decker, R. B. (Maryland Univ. College Park, MD, United States)
Lui, A. T. Y. (Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States)
Vlahos, L. (Maryland, University College Park; Johns Hopkins University, Applied Physics Laboratory, Laurel, MD, United States)
Date Acquired
August 12, 2013
Publication Date
September 1, 1984
Publication Information
Publication: Journal of Geophysical Research
Volume: 89
ISSN: 0148-0227
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: N00024-83-C-5301
CONTRACT_GRANT: N00024-78-C-05384
CONTRACT_GRANT: NASA TASK I
Distribution Limits
Public
Copyright
Other