Physics
Scientific paper
Apr 1965
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965jatp...27..559c&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 27, no. 4, pp. 559-581
Physics
12
Scientific paper
The monthly mean quiet-day daily ranges of Sq(H) and Sq(Z) at nine observatories in the equatorial electrojet region indicate a seasonal variation, mostly with equinoctial maxima and solstitial minima; these variations exceed those of cos [chi], where [chi] denotes the noon zenith angle of the sun. The Sq(Z) variations near two of these observatories show asymmetry with respect to the centre line of the jet, with large values on the side further from the geographical equator. The electrojet daily Sq ranges vary with the sunspot numbers more than do the daily ranges for some elements at stations in higher latitudes. Comparison of the irregular storm variations at three observatories under the electrojet with those at observatories in similar longitudes, situated outside the electrojet, indicates a daytime enhancement of irregular storm variation in the electrojet region. The enhancement does not continue through the night; this is explained by the night-time depletion of the E-layer ionization in the range of height where the EW electric conductivity, in low latitudes where the dip is small, is most enhanced by day.
Chapman Sydney
Raja Rao K. S.
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