Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986baicz..37..120s&link_type=abstract
Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 37, March 1986, p. 120-126.
Astronomy and Astrophysics
Astronomy
2
Coronal Holes, Ionospheric Disturbances, Magnetic Storms, Solar Eclipses, Solar Terrestrial Interactions, Sudden Ionospheric Disturbances, Critical Frequencies, F 2 Region, Ionospheric Propagation, Kp Index, Lower Ionosphere, Midlatitude Atmosphere
Scientific paper
The last decade of July 1981 was characterized by exceedingly high geoactivity, which is presented in terms of the activity in the geomagnetic field and in the lower and upper ionosphere. Some interesting deviations from the common behavior of the ionosphere during the highest geomagnetic storms are described, especially unusually weak response of the midlatitude lower ionosphere. The studied geoactivity originated during an evidently inactive period on the sun - no 'classical' source of this geoactivity, i.e., no large flare or eruption of filament, was observed. Based on the monochromatic corona observations carried out during the total solar eclipse of July 31, 1981 the authors conclude that a sporadic, low-latitude coronal hole could have been the source of this exceptionally high geoactivity.
Halenka J.
Lastovicka Jan.
Perglerova P.
Sykora Jan
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