Simultaneous observations of Sun-aligned polar cap arcs in both hemispheres by Exos-C and Viking

On September 25, 1986, the EXOS‐C satellite traversed an intense electron precipitation in the southern polar cap, while the Viking satellite simultaneously obtained image data of the polar cap arc in the northern hemisphere. The energy spectrum of the precipitation, measured by instrumentation aboa...

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Bibliographic Details
Published inGeophysical research letters Vol. 15; no. 7; pp. 713 - 716
Main Authors Obara, Takahiro, Kitayama, Masanobu, Mukai, Toshifumi, Kaya, Nobuyuki, Murphree, J. S., Cogger, L. L.
Format Journal Article
LanguageEnglish
Published Blackwell Publishing Ltd 01.07.1988
Subjects
Auroral arcs
Conjugates
Electron precipitation
EXOS-C satellite
Geophysics
Hemispheres
Instrumentation
Precipitation
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Summary:On September 25, 1986, the EXOS‐C satellite traversed an intense electron precipitation in the southern polar cap, while the Viking satellite simultaneously obtained image data of the polar cap arc in the northern hemisphere. The energy spectrum of the precipitation, measured by instrumentation aboard EXOS‐C, was very similar to that of adjacent (typical) auroral arcs, and the precipitation in the southern polar cap was observed in the same local time sector in which the arc was found in the northern polar cap. Observations seem to support the view that the polar cap arc occurs on closed field lines and is conjugate in both hemispheres.
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ISSN:0094-8276
1944-8007
DOI:10.1029/GL015i007p00713