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Title: Time/level of ionospheric response to geomagnetic storm of 25-26 July 1981 at different latitudes
Authors: David, T W
Akintola, A N
Adekoya, B J
Keywords: Solar wind plasma;Geomagnetic storm;foF2 depletion
Issue Date: Dec-2011
Publisher: NISCAIR-CSIR, India
PACS No.: 92.60.Qx; 94.20.Vv
Abstract: The reaction of the ionosphere at different latitudes may be quite different during the same storm. In this light, this paper investigates time/level of response of the upper, mid and lower latitudes stations of two different regions to an intense geomagnetic storm. The parameters solar wind plasma and imbedded interplanetary magnetic field (IMF), and foF2 have been investigated. The data has been obtained from global network of ionosondes. The analysis of solar wind plasma show that the event on 25-26 July 1981 is a type 2 storm, i.e. the ratio of the magnitude of the second to first Dst (separated by at least 3 hours) decrease is less than 0.9. The analysis of the foF2 data shows that the depletion at the time of storm occurred at a greater percentage in the upper latitude than at the mid latitude, and very small at the lower latitudes. Furthermore, there was simultaneous depletion of foF2 at all latitudes.
Page(s): 311-319
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.40(6) [December 2011]

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