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AMPTE/CCE CHEM observations of the energetic ion population at geosynchronous altitudesThe paper presents results of a statistical study of average characteristics of the energetic ion population at geosynchronous altitudes, using energetic-ion (1-300 keV/e) measurements from the CHEM spectrometer aboard the AMPTE Charge Composition Explorer between January 1985 and June 1987. Data were sorted into four MLT groups and two extreme geomagnetic activity levels ('very quiet' for AE less than 30 nT and 'very active' for AE greater than 700 nT). A clear quiet-time dayside feature found in the measurements was a dip in H(+) and He(2+) spectra, at 6.6 keV/e in the prenoon sector and at 3.5 keV/e in the postnoon sector. During active times, the ion fluxes increased (except for He(+)), and the O(+) contribution to the total energy density increased dramatically. The pitch angle distributions were normal during quiet times and isotropic or field-aligned during active times.
Document ID
19930071390
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Daglis, Ioannis A.
(Max-Planck-Inst. fuer Aeronomie Katlenburg-Lindau, Germany)
Sarris, Emmanuel T.
(Thrace Univ. Xanthi; Athens, National Observatory, Greece)
Wilken, Berend
(Max-Planck-Inst. fuer Aeronomie Katlenburg-Lindau, Germany)
Date Acquired
August 16, 2013
Publication Date
August 1, 1993
Publication Information
Publication: Annales Geophysicae
Volume: 11
Issue: 8
ISSN: 0992-7689
Subject Category
Geophysics
Accession Number
93A55387
Funding Number(s)
CONTRACT_GRANT: NAG5-716
CONTRACT_GRANT: NAGW-101
CONTRACT_GRANT: BMFT-010-M-158-0
Distribution Limits
Public
Copyright
Other

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