AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 80. Here Comes the Sun: Plans for the Y2K Solar Maximum
Solar, Oral, Wednesday, June 2, 1999, 3:45-5:30pm, Continental Ballroom C

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[80.10] The Observed Spectral Evolution of Solar Flare Hard X-Ray Emission

E. K. Newton (NASA Marshall Space Flight Center), T. Giblin (University of Alabama in Huntsville)

The spectral evolution of flare emission may be characterized using color-color diagrams (CCDs), a technique which has been widely employed by the astrophysics community, but not yet by the solar flare community. CCDs are constructed for a sample of flares observed simultaneously by CGRO/BATSE and Yohkoh/HXT. It is found that flare spectral evolution follows one of only a few patterns, which generally evolve differently than the soft-hard-soft pattern put forth as the norm in previous work. The implications for the nature of flare energy release and acceleration/propagation models are discussed.

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