Autumn and winter anomalies in ionospheric absorption as measured by riometers

Details Autumn and winter anomalies in ionospheric absorption as measured by riometers Autumn and winter anomalies in ionospheric absorption as measured by riometers

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jatp...45..193r&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 45, April 1983, p. 193-202. Research supported by the Acad

Physics

6

Annual Variations, Cosmic Noise, Ionospheric Propagation, Radio Attenuation, Riometers, Anomalies, Auroral Zones, D Region, Electromagnetic Absorption, Equatorial Atmosphere, F Region, Finland, Temperate Regions

Scientific paper

Seasonal variation of ionospheric absorption has been studied on the basis of riometer (A2) measurements obtained over a wide latitude range. In agreement with the results of earlier studies of A1 radio wave absorption, equinoctial maxima of approximately equal amplitude are observed in the auroral zone and near the equator. At mid-latitudes riometer absorption maximizes during the fall season, whereas the A1 data show a semi-annual variation with maxima occurring in summer and winter. The autumn maximum, or autumn anomaly, in riometer absorption is observed at much higher geographic latitude in the southern than in the northern hemisphere but at comparable geomagnetic latitudes in both hemispheres. The secondary maximum in riometer absorption at mid-latitudes during the winter months, the winter anomaly, is seen only if absorption is calculated at constant solar zenith angle. The different methods for determining a quiet-day curve are discussed.

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