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The 2- to 12-min quasi-periodic variation of 50- to 1000-keV trapped electron fluxesIt was previously shown that trapped electron fluxes of energies in the range from 50 keV to 1 MeV observed in the afternoon magnetosphere during substorms frequently undergo periodic variations. High-resolution electron spectrometer data indicate that these electron variations are periodic in the range of about 2-12 min, correlated with magnetic field variations, organized by the local magnetic field, and dependent on pitch angle. The observations suggest that the electron variations are adiabatic. The study derives quantitative adiabatic expressions of particle flux variations in a model geomagnetic field perturbation to show that the observational features are consistent with effects arising from adiabatic modulation of trapped particle fluxes.
Document ID
19760061664
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lin, C. S.
(NASA Goddard Space Flight Center Greenbelt, Md.; Washington, University, Seattle, Wash., United States)
Parks, G. K.
(Washington, University Seattle, Wash., United States)
Winckler, J. R.
(Minnesota, University Minneapolis, Minn., United States)
Date Acquired
August 8, 2013
Publication Date
September 1, 1976
Publication Information
Publication: Journal of Geophysical Research
Volume: 81
Subject Category
Geophysics
Report/Patent Number
AD-A071702
Accession Number
76A44630
Funding Number(s)
CONTRACT_GRANT: N00014-67-A-0103-0039
CONTRACT_GRANT: NSF ATM-74-02762A02
CONTRACT_GRANT: NGR-48-002-154
CONTRACT_GRANT: NAS-9542
Distribution Limits
Public
Copyright
Other

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