D-region observations of polar cap absorption events during the EISCAT operation in 1981-1989

Details D-region observations of polar cap absorption events during the EISCAT operation in 1981-1989 D-region observations of polar cap absorption events during the EISCAT operation in 1981-1989

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jatp...55..751r&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 55, no. 4-5, p. 751-766.

Computer Science

Sound

3

D Region, Eiscat Radar System (Europe), Ionospheric Sounding, Polar Caps, Atmospheric Attenuation, Diurnal Variations, Solar Protons

Scientific paper

During the years 1981-1989, 71 solar proton events altogether were observed. Dividing the events into strong, p.f.u. greater than 1000 (where p.f.u. is proton flux measured at geosynchronous satellite orbit in units of (sq cm sr) exp -1), medium, p.f.u. between 100 and 1000, and weak events, p.f.u. less than 100, only the strong and medium events have a considerable effect on the lower ionosphere. The mean daily absorption at 30 MHz (A), measured in the auroral zone, is greater than 2 dB during strong events, less than 2 dB during medium events, and less than 1 dB during weak events. The most active year during the EISCAT operation was 1989 when 23 solar proton events were observed including six strong events. Diurnal variation of the electron density in the D-region during polar cap absorption is a function of the solar zenith angle. However, south of L = 5 a minimum in absorption is observed during the noon hours.

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