The geomagnetic Sq variation - Annual, semi-annual and solar cycle variations and ring current effects

Details The geomagnetic Sq variation - Annual, semi-annual and solar cycle variations and ring current effects The geomagnetic Sq variation - Annual, semi-annual and solar cycle variations and ring current effects

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jatp...47..341h&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 47, April 1985, p. 341-352.

Physics

17

Annual Variations, Geomagnetic Pulsations, Ionospheric Conductivity, Ring Currents, Solar Activity Effects, Solar Cycles, Diurnal Variations, E Region, Temporal Resolution

Scientific paper

The difference between H at two magnetic observatories having the same longitude but latitudes equatorwards and polewards of the latitude of the Sq focus yields a measure of Sq intensity largely free from disturbance. Data from all days may be used, which results in improved time resolution of the variations of Sq. As well as an annual variation in Sq with a maximum in local summer, there is a substantial semiannual variation with equinoxial maxima. It is proposed that the annual variation is due mainly to the annual variation in conductivity of the E-region, and that the semiannual variation arises from the semiannual variation in the thermospheric neutral temperature. The solar-cycle variation is also delineated. There is a non-Sq annual variation in the midnight values of H that appears to exist also at other hours of the night and probably throughout the 24 h. It is consistent with an annual north-south motion of the ring current. The implication of this for the Sq baseline problem is discussed.

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