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Session 2 - Everything Else.
Display session, Friday, June 27
Ballroom C, Chair: Richard Canfield

[2.66] January 5-12, 1997 Heliospheric Substorm: Morphology and Interpretation

K. Ivanov, E. Romashets (IZMIRAN, Troitsk, Moscow Region, 142092 Russia)

The solar sources, dynamics, MHD-structure and geometry of the January, 9-12 1997 near-Earth interplanetary disturbances were con sidered in the lights of SOHO, WIND, and INTERBALL plasma and IMF data. The solar magnetic field data (T.Hoeksema, Internet) and preliminary analises of the disturbances given by D.F.Webb and L.F.Burlaga (Internet) were taken into account. The brief summary of our findings is here outlined. The solar sources. The two coronal mass ejections (filament- associated) and the heliospheric current sheet (HCS) were strongly involved into a scenario of the event. Dynamics. It was a typical (as in Ivanov et al., 1995, Solar Wind Eight, p.575) heliospheric substorm (HS) with three- phase IMF and plasma dynamics. The onset of the growth phase of the HS at 1 AU was on Jan. 9 at 0930 UT, long before the forward shock wave arrival to the WIND location. MHD-structure. Preliminary, at least seven specific bounda- ries were identified. Some of them were shock waves and rotational discontinuities. They say about the common featu- res of the event and its origin, and evolution. Interpretation. The near-Earth plasma and IMF variations during this event were tentatively explained in terms of HCS current jets (Ivanov and Romashets, 1997, in press) and Ma et. al. (1991,JGR) solution on a plasma cylinder inter- actionwith a tangential discontinuity.

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