AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 17. Coronal Mass Ejections
Display, Monday, May 31, 1999, 9:20am-6:30pm, Southeast Exhibit Hall

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[17.01] SOHO Observations of a Helical Coronal Mass Ejection

J.C. Raymond (CfA), A. Ciaravella (Palermo), A. van Ballegooijen (CfA), B. Thompson (GSFC)

The EIT, LASCO and UVCS instruments aboard SOHO observed a CME on Dec. 11/12 1997. The ejected prominence material rose relatively slowly, averaging 150 km/s, but Doppler shifts as great at -300 km/s were seen in the O VI lines. The observed gas spans the temperature range from about 30,000 K to 300,000 K. The observations can be modeled as left-handed helix which untwists at about 0.0009 radians/sec. Considerable heating as the plasma moves from the solar surface to 1.7 solar radii is required to explain the observed temperature range.

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