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Electromagnetic ion cyclotron waves stimulated by modest magnetospheric compressionsAMPTE/CCE magnetic field and particle data are used to test the suggestion that increased hot proton temperature anisotropy resulting from convection during magnetospheric compression is responsible for the enhancement in Pc 1 emission via generation of electromagnetic ion cyclotron (EMIC) waves in the dayside outer equatorial magnetosphere. The relative increase in magnetic field is used to gauge the strength of the compression, and an image dipole model is used to estimate the motion of the plasma during compression. Proton data are used to analyze the evolution of the proton distribution and the corresponding changes in EMIC wave activity expected during the compression. It is suggested that enhancements in dynamic pressure pump the energetic proton distributions in the outer magnetosphere, driving EMIC waves. Waves are expected to be generated most readily close to the magnetopause, and transient pressure pulses may be associated with bursts of EMIC waves, which would be observed on the ground in association with ionospheric transient signatures.
Document ID
19930062098
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Anderson, B. J.
(Johns Hopkins Univ. Laurel, MD, United States)
Hamilton, D. C.
(Maryland Univ. College Park, United States)
Date Acquired
August 16, 2013
Publication Date
July 1, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: A7
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
93A46095
Funding Number(s)
CONTRACT_GRANT: NAG5-716
CONTRACT_GRANT: NAGW-3052
Distribution Limits
Public
Copyright
Other

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