Ionospheric disturbances during the severe magnetic storm of November 7 10, 2004

Details Ionospheric disturbances during the severe magnetic storm of November 7 10, 2004 Ionospheric disturbances during the severe magnetic storm of November 7 10, 2004

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007ge%26ae..47..720g&link_type=abstract

Geomagnetism and Aeronomy, Volume 47, Issue 6, pp.720-738

Physics

4

94.20.Vv, 94.30.Lr

Scientific paper

Results of the study of the behavior of the F 2 region and topside ionosphere during the magnetic storm on November 7 10, 2004, which was a superposition of two sequent Severe magnetic disturbances ( Kp = 9 ) are presented. The observations were conducted by the incoherent scatter radar at Kharkov. Considerable effects of a negative ionospheric disturbance are registered, including a decrease in the electron density in the F 2-layer maximum by a factor of 6 7 and of the total electron content up to a height of 1000 km by a factor of 2, a lifting up of the ionospheric F 2 layer by 300 km at night and by 150 180 km in the daytime, unusual nighttime heating of the plasma with an increase of the ion and electron temperatures up to 2000 and 3000 K, respectively, and a decrease in the relative density of hydrogen ions N(H+)/ N e by a factor of up to 3.5 because of the emptying of the magnetic flux tube passing over Kharkov. The effects usually observed in the high-latitude ionosphere, including the coherent echoes, are detected during the main phase of the storm. The results obtained manifest a shift of the large-scale structures of the high-latitude ionosphere (the auroral oval, main ionospheric trough, hot zone, etc.) down to latitudes close to the latitude of the Kharkov radar.

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