Global geomagnetic response to a sharp compression of the magnetosphere and IMF variations on October 29, 2003

Details Global geomagnetic response to a sharp compression of the magnetosphere and IMF variations on October 29, 2003 Global geomagnetic response to a sharp compression of the magnetosphere and IMF variations on October 29, 2003

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cosre..42..597s&link_type=abstract

Cosmic Research, Volume 42, Issue 6, pp.597-606

Computer Science

1

Scientific paper

We study the response of the ionosphere and magnetosphere to a sudden commencement (SC) on October 29, 2003, at 06:11 UT. It is shown that the geomagnetic response had the form of two successive stages. In the first ˜5 min after the SC, a strong intensification of a two-vortex current system of the DP2 type was observed in latitudes ˜67°-65°, with variations of Δ H -4000 nT (+700 nT). At the same time, energetic electrons were injected without dispersion to geosynchronous orbits simultaneously in the sectors ˜16, ˜04, and ˜07 MLT. In the subsequent 5 15 min, a new intensification of the western electrojet took place in all time sectors at latitudes ˜70°. Around midnight, this electrojet was extended in the poleward direction up to the polar cap latitudes (Φ’ ≈ 75°-83°). It had an unusually high velocity of extension (up to ˜5.0 km/s) and was accompanied by typical dispersionless substorm injections, but only at meridians ˜04 and 07 MLT. From comparing the development of electrojets with the data of satellite observations in the solar wind and magnetosphere, we suggest that ˜3 5 min after the SC onset a dipolization of the magnetic field at the geosynchronous orbit occurred. It was connected with the decay of the current flowing across the magnetotail. The subsequent extension of the region of current decay into the tail up to 150 R E proceeded with a velocity of ≥1000 km/s, which exceeds the known velocities of such an extension by a factor of ˜5.

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