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Association between magnetic field fluctuations and energetic particle bursts in the earth's magnetotailThe association between energetic protons (0.29-0.50 MeV) and simultaneous local fluctuations of magnetic field at 35 to 45 earth radii in the magnetotail is examined statistically with data from APL/JHU particle telescopes aboard IMP 7 and IMP 8. About four satellite years of 5.5 min averaged measurements are used in this study. In addition to confirming that the level of magnetic field fluctuations generally increases with the presence of energetic protons and their streaming anisotropy, it is found that increases in occurrence frequency of streaming of energetic protons are ordered far better by magnetic field fluctuations than by proximity to the neutral sheet. However, the presence of large magnetic field fluctuations (delta B greater than 5 nT or delta B/B greater than 50%) is neither a necessary nor a sufficient condition for the detection of large streaming in energetic protons.
Document ID
19820063791
Document Type
Reprint (Version printed in journal)
Authors
Lui, A. T. Y. (Kansas Univ. Lawrence, KS, United States)
Krimigis, S. M. (Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States)
Armstrong, T. P. (Kansas, University Lawrence, KS, United States)
Date Acquired
August 10, 2013
Publication Date
October 1, 1982
Publication Information
Publication: Journal of Geophysical Research
Volume: 87
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: NSF ATM-79-25987
CONTRACT_GRANT: NASA TASK I
CONTRACT_GRANT: N00024-78-C-5384
Distribution Limits
Public
Copyright
Other