Dayside auroral activity and magnetic flux transfer from the solar wind

Details Dayside auroral activity and magnetic flux transfer from the solar wind Dayside auroral activity and magnetic flux transfer from the solar wind

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16...33l&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, Jan. 1989, p. 33-36. Research supported by the Norsk Polarinstitutt.

Physics

57

Auroral Zones, Geomagnetism, Magnetic Flux, Solar Wind, Daytime, Eiscat Radar System (Europe), Momentum Transfer, Visible Spectrum

Scientific paper

Combined observations by meridian-scanning photometers and the EISCAT radar show that the 'midday-auroral breakup' phenomenon is associated with major increases in ionospheric flow. A sequence of nine events is observed in the early afternoon MLT sector during a period when the IMF is strongly southward with a large positive B(y) component. Each auroral structure is seen at both 630 and 557.7 nm and initially moves westward, accompanied by an increase in potential of 30-60 kV across the north-south dimension of the EISCAT field-of-view. After a few minutes the arc (or arc fragment) moves into the polar cap and fades, and the velocities observed by the radar swing from westward toward northward. It is concluded that dayside auroral breakup is closely associated with momentum transfer across the magnetopause which occurs in a series of events 5-15 minutes apart.

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