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Electron polar cap and the boundary of open geomagnetic field lines.A total of 333 observations of the boundary of the polar access region for electrons (energies greater than 530 keV) provides a comprehensive map of the electron polar cap. The boundary of the electron polar cap, which should occur at the latitude separating open and closed field lines, is consistent with previously reported closed field line limits determined from trapped-particle data. The boundary, which is sharply defined, seems to occur at one of three discrete latitudes. Although the electron flux is generally uniform across the polar cap, a limited region of reduced access is observed about 10% of the time.
Document ID
19720060856
Document Type
Reprint (Version printed in journal)
Authors
Evans, L. C.
(California Institute of Technology, Pasadena; NASA, Ames Research Center Moffett Field, Calif., United States)
Stone, E. C.
Date Acquired
August 6, 2013
Publication Date
October 1, 1972
Publication Information
Publication: Journal of Geophysical Research
Volume: 77
Subject Category
Geophysics
Report/Patent Number
NSSDC-ID-67-073A-O8-PM
Funding Number(s)
CONTRACT_GRANT: NAS5-3095
CONTRACT_GRANT: NGR-05-002-160
Distribution Limits
Public
Copyright
Other
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