Physics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989p%26ss...37.1347l&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 37, Nov. 1989, p. 1347-1365.
Physics
115
Auroral Zones, Daytime, Interplanetary Magnetic Fields, Ionospheric Disturbances, Magnetopause, Momentum Transfer, Field Of View, International Sun Earth Explorers, Interplanetary Medium, Magnetic Flux
Scientific paper
Data from EISCAT radar, meridian-scanning photometers, and an all-sky TV camera are used to study the orientation of the IMF during transient bursts of ionospheric flow and auroral activity in the dayside auroral ionosphere. During an initial period of about 45 min, the IMF is strongly southward in GSM coordinates and ionospheric flow and auroral burst events occur regularly with a period of 8.3 + or - 0.6 min. In the following 1.5 h, the IMF is predominantly northward, and the mean interval between events increases to 19.2 + or - 1.7 min. The results suggests that transient momentum exchange between the magnetosheath and the ionosphere occurs quasi-periodically when the IMF is continuously southward, with a mean period similar to that for flux transfer events.
Cowley Stan W. H.
Lockwood Marian
Oguti Takasi
Sandholt Per Even
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