Radio aurora observations at medium latitude over two solar cycles

Details Radio aurora observations at medium latitude over two solar cycles Radio aurora observations at medium latitude over two solar cycles

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46..673s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, Aug. 1984, p. 673-675, 677-684.

Physics

1

Auroral Echoes, Midlatitude Atmosphere, Periodic Variations, Radio Auroras, Solar Cycles, Solar Terrestrial Interactions, Annual Variations, Diurnal Variations, Interplanetary Magnetic Fields, Ionospheric Currents, Magnetic Variations, Particle Precipitation, Radar Echoes

Scientific paper

Quasi-continuous radio aurora observations have been made at Kuehlungsborn, D.D.R. (lat = 54 N) by a 33 MHz radar during the period 1958-1981. From these observations characteristic diurnal, seasonal, and solar cycle variations of the probability of occurrence of auroral radar echoes at medium latitude have become evident. Whereas the solar cycle variation of auroral activity is very similar to that of the geomagnetic activity, this is only partly true for the seasonal variation, and not at all for the diurnal variation. The seasonal variation is slightly modified in addition by a tendency to higher aurora probability in winter than at the same level of geomagnetic activity in summer, and the diurnal variation is almost totally determined by the diurnal variation of the horizontal electric field in the ionosphere. Also, an influence of the sector structure of the interplanetary magnetic field upon the diurnal and seasonal variations of radio aurora activity has been identified.

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