O(+) and He(+) restricted and extended (bi-modal) ion conic distributions

Details O(+) and He(+) restricted and extended (bi-modal) ion conic distributions O(+) and He(+) restricted and extended (bi-modal) ion conic distributions

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1439p&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 14, July 24, 1992, p. 1439-1442. Research supported by Lockheed Corp

Physics

30

Helium Ions, Ion Distribution, Ionospheric Ion Density, Oxygen Ions, Space Plasmas, Geomagnetism, Ion Temperature

Scientific paper

An 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.

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