Flare Prediction and the Unresolved Corona

Details Flare Prediction and the Unresolved Corona Flare Prediction and the Unresolved Corona

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh13a0280w&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SH13A-0280

Physics

7509 Corona, 7519 Flares, 7594 Instruments And Techniques

Scientific paper

Discovery of the precursors to flare onset are paramount to the increased need for accurate space weather prediction. A potential indicator for flaring activity may be the temperature structure of the active region background emission. The active region background, or unresolved active region corona (UARC), can be modeled using a hydrostatic model for the density stratification as a function of altitude. Exponential decreases in the intensity of EUV emission above the limb and within active regions have been used to determine the scale-height temperature of the UARC. ``Quiescent'' active region data was examined, and the scale-height temperature determined was found to be constant in time and slowly decreasing with distance from the center of the active region. ``Flaring'' active region emission was found to be quite different. Prior to the onset of the flare, the estimated scale height temperature was nearly constant. Just before the peak in the GOES 8 x-ray flux, it was determined to be multithermal, varying by as much as 0.7 MK over the multiple spectral lines observed. The scale-height temperatures were all observed to increase before the flare and reached a maximum subsequent to the GOES 8 x-ray peak.This work is supported under the TRACE mission, NASA contract SP02H8201R.

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