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Interaction of ring current and radiation belt protons with ducted plasmaspheric hiss. 1: Diffusion coefficients and timescalesProtons that are convected into the inner magnetosphere in response to enhanced magnetic activity can resonate with ducted plasmaspheric hiss in the outer plasmasphere via an anomalous Doppler-shifted cyclotron resonance. Plasmaspheric hiss is a right-hand-polarized electromagnetic emission that is observed to fill the plasmasphere on a routine basis. When plasmaspheric hiss is confined within field-aligned ducts or guided along density gradients, wave normal angles remain largely below 45 deg. This allows resonant interactions with ions at typical ring current and radiation belt energies to take place. Such field-aligned ducts have been observed both within the plasmasphere and in regions outside of the plasmasphere. Wave intensities are estimated using statistical information from studies of detached plasma regions. Diffusion coefficients are presented for a range of L shells and proton energies for a fixed wave distribution. Harmonic resonances in the range N = +/-100 are considered in order to include interactions between hiss at 100 Hz to 2 kHz frequencies, and protons in the energy range between approximately 10 keV and 1000 keV. Diffusion timescales are estimated to be of the order of tens of days and comparable to or shorter than lifetimes for Coulomb decay and charge exchange losses over most of the energy and spatial ranges of interest.
Document ID
19950037072
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kozyra, J. U.
(University of Michigan, Ann Arbor, MI United States)
Rasmussen, C. E.
(University of Michigan, Ann Arbor, MI United States)
Miller, R. H.
(University of Michigan, Ann Arbor, MI United States)
Lyons, L. R.
(Aerospace Corporation Los Angeles, CA, United States)
Date Acquired
August 16, 2013
Publication Date
March 1, 1994
Publication Information
Publication: Journal of Geophysical Research
Volume: 99
Issue: A3
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
95A68671
Funding Number(s)
CONTRACT_GRANT: NAGW-2006
CONTRACT_GRANT: NAGW-1619
CONTRACT_GRANT: NAG5-1541
CONTRACT_GRANT: NSF ATM-91-14409
CONTRACT_GRANT: NAG5-472
Distribution Limits
Public
Copyright
Other

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