The distribution of dense Es ionization at high latitudes

Details The distribution of dense Es ionization at high latitudes The distribution of dense Es ionization at high latitudes

Jul 1962

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962jatp...24..643t&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 24, no. 7, pp. 643-657

Physics

3

Scientific paper

Vertical incidence ionospheric data obtained during the I.G.Y. have been used to study the occurrence of dense Es over the Arctic and Antarctic continents. At any Universal Time there is a tendency for Es to occur in each hemisphere along an arc which extends from the region of the magnetic poles to lower latitudes with a gradual increase of easterly longitude. The times of maximum occurrence of Es are similar at magnetically conjugate points. The numerous detailed data which are available for the Northern Hemisphere have been examined for changes with season and magnetic activity. The time of the diurnal peak occurrence of Es is later in summer than in winter except at stations in a sector near 300° geomagnetic longitude; the peak occurs earlier as magnetic activity increases. An increase in magnetic activity is accompanied by an increase in Es occurrence at geomagnetic latitudes below 70-75° and by a decrease at higher latitudes. The more limited data from the Southern Hemisphere give similar results and show that there is a close relationship between phenomena at magnetically conjugate points. Data covering about ten years from Canadian stations show that, near the auroral zone, the maximum occurrence of dense Es coincides with the minimum of the solar cycle; at lower latitudes, the maximum is found during years of maximum magnetic activity. The results obtained for Es in this study are briefly discussed in relation to similar studies of the behaviour of auroral blackouts and visual aurorae.

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