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Low-latitude particle precipitation and associated local magnetic disturbancesThe paper investigates the O(+) ion and NO(+) ion temperature and temperature anisotropy for a spatially homogeneous auroral F region in the presence of large electric fields perpendicular to the geomagnetic field. The maximum optical emissions at midlatitudes occur in concert with the maximum positive (northward) excursions in the H trace and with rapid fluctuations in the D trace of nearby magnetograms. The source of the particles is inferred to be the ring current, with precipitation occurring when the Dst index is large at the time of the large short-term excursions in the local magnetic field. This result is consistent with the finding of Voss and Smith (1979), derived from a series of rocket measurements of precipitating heavy particles, that the flux correlates better with the product of Dst and the exponential of Kp than with either alone. It is shown that the product of Dst and the amplitude of the short-term excursions in the horizontal component in local magnetograms has better time resolution and better correlation with the observed emission rates than the index using Kp.
Document ID
19920050937
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Rassoul, H. K.
(Florida Institute of Technology Melbourne, United States)
Rohrbaugh, R. P.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Tinsley, B. A.
(Texas, University Richardson, United States)
Date Acquired
August 15, 2013
Publication Date
April 1, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: A4 A
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
92A33561
Funding Number(s)
CONTRACT_GRANT: NSF ATM-87-18391
CONTRACT_GRANT: NSF ATM-91-07802
CONTRACT_GRANT: NAS8-33827
Distribution Limits
Public
Copyright
Other

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