Physics
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jatp...47..601t&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 47, June 1985, p. 601-609.
Physics
22
E Region, F Region, Ionospheric Conductivity, Ionospheric Currents, Nocturnal Variations, Solar Activity, Dynamo Theory, Sunspots
Scientific paper
The conductivity in the ionosphere and the nocturnal ionospheric currents are examined using the International Reference Ionosphere model. In particular, it is found that at night the Pedersen conductivity of the F-region is higher than that of the E-region. When the solar activity is high, the Pedersen conductivity of the F-region is higher than both Pedersen and Hall conductivities of the E-region. The height profile of the conductivity varies significantly with the solar activity. Changes in the structure of conductivity with the solar activity can explain the differences between the geomagnetic Sq field at the sunspot maximum and that at the sunspot minimum. A preliminary impulse of geomagnetic sudden commencement is observed at low latitudes without the equatorial enhancement of its amplitude at night mainly when the solar activity is high. These observations are consistent with the conductivity distributions obtained.
Araki Takeo
Takeda Masayasu
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