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Anticipating HESSI's Spatially Resolved View of Spectral Evolution  

Elizabeth Newton   Submitted: 2000-02-22 18:00

The spectral evolution of observed flares' hard X-ray emission is found to conform to certain patterns in color-color diagrams. By combining the spectral resolution of BATSE data with the spatial resolution of HXT data, we are able to address the nature of flare energy release and anticipate what kind of observations HESSI may make of the energy release/particle acceleration site in flares.

Authors: Newton, E.K., Giblin, T., & Metcalf, T.
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Publication Status: APS Proceedings of the High Energy Solar Physics Workshop
Last Modified: 2000-02-22 18:00
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The Spectral Evolution of Solar Flare Hard X-ray Emission Observed with BATSE  

Elizabeth Newton   Submitted: 2000-02-22 18:00

We present a more detailed characterization of spectral evolution in solar flare hard X-ray emission than has been previously described. Our characterization is consistent with some earlier results but utilizes higher time resolution data and reveals nuances in spectral evolution that have never been reported. We employ an underutilized data set, the BATSE solar flare catalog, for our investigation and different methodology than previous studies. Our findings support the conclusion that properties of the particle acceleration mechanism in flares, such as the acceleration rate or efficiency, are indeed important to understanding spectral evolution. On the other hand, time-of-flight models, which assume accelerator properties to be negligible, cannot explain the observed detailed spectral evolution, and correlations that we would expect to exist between spectral evolution patterns and parameters derived from time-of-f- time-of-flight model inversions are not supported by the data. In this fashion, we establish an observational context in which to interpret future HESSI observations and delineate some constraints for theoretical models of particle acceleration.

Authors: Newton, Elizabeth K. & Giblin, Timothy
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Publication Status: ApJ (submitted)
Last Modified: 2000-02-22 18:00
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Anticipating HESSI's Spatially Resolved View of Spectral Evolution
The Spectral Evolution of Solar Flare Hard X-ray Emission Observed with BATSE

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