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Session 1 - Chromosphere, Corona, Flares.
Display session, Friday, June 27
Ballroom B, Chair: Charles Kankelborg

[1.30] SOHO/EIT and SOHO/LASCO Observations of the April 1 1997 Event: Coronal Observations of a Moreton Wave

B. J. Thompson, J. S. Newmark (Applied Research Corp./NASA GSFC), J. B. Gurman (NASA Goddard Space Flight Center), O. C. St. Cyr, S. Stezelberger (Computational Physics, Inc.)

The SOHO Extreme ultraviolet Imaging Telescope (EIT) recorded a series of events on April 1, 1997 with a 12-minute cadence of 195 Angstrom (Fe XII) images. A Moreton wave was observed emanating from a flaring active region beginning at 13:56 UT 1-April-1997. The wave travelled at initial speeds of approximately 300 km/sec, spreading across the solar disk radially from the flare. The CME observed by SOHO/LASCO was observable at both the east and west limbs in the C2 (2-6 solar radii) and C3 (3.7-30 solar radii) coronagraphs. The event was the site of strong emerging flux, and a number of explosive jet-like surges were observed at the east edge of the region prior to, throughout, and following the event.

The discussion will include topology, comparison to Moreton wave/MHD theory predictions, and solar wind signatures.

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Program listing for Friday