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O(+) and He(+) restricted and extended (bi-modal) ion conic distributionsAn automated procedure using standard image processing techniques has been developed that finds and characterizes energetic ion conic events in the data acquired by the Energetic Ion Composition Spectrometer on DE-1 in the altitude range 8000 to 24000 km. The algorithm discriminates between the two types of ion conic distribution, those restricted to a narrow angular range and those extended in angle. Extended (bimodal) ion conic distributions also have a significant flux of field-aligned energetic ions. Extended ion conics constitute more than one third of the ion conics found. The two types of ion conic distribution have different altitude dependences. The average properties of energetic conic distributions suggest that conic formation by localized, explosive, transverse energization is not the dominant mechanism responsible for producing energetic conic distributions above 8000 km.
Document ID
19920068532
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Peterson, W. K.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Collin, H. L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Doherty, M. F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Bjorklund, C. M.
(Lockheed Research Laboratories Palo Alto, CA, United States)
Date Acquired
August 15, 2013
Publication Date
July 24, 1992
Publication Information
Publication: Geophysical Research Letters
Volume: 19
Issue: 14 J
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
92A51156
Funding Number(s)
CONTRACT_GRANT: NAS5-33032
Distribution Limits
Public
Copyright
Other

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