Mid-latitude effects of the May 15, 1997 magnetic storm

Details Mid-latitude effects of the May 15, 1997 magnetic storm Mid-latitude effects of the May 15, 1997 magnetic storm

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jastp..65..203b&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 65, Issue 2, p. 203-210.

Physics

14

Scientific paper

We investigate the May 15, 1997 magnetic storm effects on the mid- and low-latitude ionosphere. The study is based on using the data from three chains of ionospheric stations located approximately along the meridians /20°, /140° and /280°E in the geomagnetic latitude range 13-/65°N. Variations in f0F2 are considered. Estimates of the zonal electric fields are made. Results of our analysis show that the main ionospheric effects of the storm under consideration are: (1) long-lasting intense negative disturbances during the storm main and recovery phases at subauroral and mid-latitudes; (2) positive disturbances at stations of the European and American chains observed prior to the storm, regardless of the local time; (3) a positive peak of Δf0F2 at stations of the Asian chain during the storm main phase in the evening hours; (4) a similarity of the form of the Δf0F2-variations at different latitudes and (5) the largest effect on the F region is observed at the Asian chain. The resulting differences of the Δf0F2-variations can be driven both by the local time of the sudden storm commencement and by magnetic dip. It is not mere chance that the largest differences are observed along the meridian /140°E where the difference between the geographic and magnetic poles is the largest.

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