The long term variation in the ionospheric winter absorption anomaly

Details The long term variation in the ionospheric winter absorption anomaly The long term variation in the ionospheric winter absorption anomaly

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jatp...38..423b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 38, Apr. 1976, p. 423-429.

Physics

1

Electromagnetic Absorption, Ionospheric Propagation, Magnetic Anomalies, Solar Cycles, Solar X-Rays, Winter, Long Term Effects, Magnetic Disturbances, Midlatitude Atmosphere, Solar Activity Effects, Sunspots

Scientific paper

An analysis of vertical-incidence absorption data for a midlatitude station (Freiburg, W. Germany, 48 deg N, 7.5 deg E) for the 13-year period 1957-1969 shows that there is a solar-cycle variation both in the number of winter-anomaly days and in the magnitude of the absorption anomaly. The magnitude of this variation is discussed in relation to solar X-ray flux and geomagnetic disturbance. The magnitude of winter-anomaly absorption is a maximum in the frequency range 2-2.5 MHz. Comparison of the winter-anomaly phenomenon at a range of midlatitude stations suggests that there may be a small longitudinal variation in the magnitude of the phenomenon.

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