Dayside auroral activities and their implications for impulsive entry processes in the dayside magnetosphere

Details Dayside auroral activities and their implications for impulsive entry processes in the dayside magnetosphere Dayside auroral activities and their implications for impulsive entry processes in the dayside magnetosphere

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jatp...53..219l&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 53, Mar.-Apr. 1991, p. 219-229. NASA-supported research.

Physics

20

Auroras, Earth Ionosphere, Earth Magnetosphere, Flux Transfer Events, Solar Wind, Auroral Zones, Dynamic Pressure, Magnetic Field Reconnection, Magnetosheath, Satellite Imagery

Scientific paper

The dayside auroral bright spots as observed by the Viking satellite are studied and the evidence that argues against the notion that these auroral bright spots are the optical signatures of FTEs in the ionosphere is discussed. Reports of transient dayside auroral phenomena that were interpreted as the optical signatures of FTEs to determine the solar wind conditions at the time of the events are examined. It is found that many of the previously reported transient occurrences of poleward drifting auroral arcs in the dayside auroral region can be associated with sudden increases in the solar wind dynamic pressure. An explanation of these events is offered in terms of solar wind dynamic pressure enhancement.

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