Geophysical effects of the interplanetary magnetic cloud on October 18-19, 1995, as deduced from observations at Irkutsk

Details Geophysical effects of the interplanetary magnetic cloud on October 18-19, 1995, as deduced from observations at Irkutsk Geophysical effects of the interplanetary magnetic cloud on October 18-19, 1995, as deduced from observations at Irkutsk

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jastp..62..737z&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 62, Issue 9, p. 737-749.

Physics

1

Scientific paper

During an interaction of the Earth's magnetosphere with the interplanetary magnetic cloud on October 18-19, 1995, a great magnetic storm took place. Extremely intense disturbances of the geomagnetic field and ionosphere were recorded at the midlatitude observatory at Irkutsk (/Φ'~45°, /Λ'~177°, /L~2) in the course of the storm. The most important storm features in the ionosphere and magnetic field are: a significant decrease in the geomagnetic field Z component during the storm main phase; unusually large amplitudes of geomagnetic pulsations in the Pi1 frequency band; extremely low values of critical frequencies of the ionospheric F2-layer; an appearance of intense Es-layers similar to auroral sporadic layers at the end of the recovery phase. These magnetic storm manifestations are typical for auroral and subauroral latitudes but are extremely rare in middle latitudes. We analyze the storm-time midlatitude phenomena and attempt to explore the magnetospheric storm processes using the data of ground observations of geomagnetic pulsations. It is concluded that the dominant mechanism responsible for the development of the October 18-19, 1995 storm is the quasi-stationary transport of plasma sheet particles up to /L~2 shells rather than multiple substorm injections of plasma clouds into the inner magnetosphere.

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