Studying Solar Flares with YOHKOH and the Compton Gamma-Ray Observatory
We apply a DC-electric field model to the analysis of soft and hard X-ray observations of a solar flare observed by Yohkoh and the Compton Gamma-Ray Observatory on 1992 September 6. The flare was observed in Ca XIX by the Yohkoh Bragg Crystal Spectrometer (BCS) and simultaneously in hard X-rays by the CGRO Burst and Transient Spectrometer Experiment (BATSE). A strong stationary component of Ca XIX emission was observed at the start of impulsive hard X-ray emission indicating an extended phase of heating prior to the production of energetic nonthermal electrons. We interpret the preflare Ca XIX emission as a signature of Joule heating by field-aligned currents. We relate the temporal variation of impulsive hard X-ray emission to the rate of runaway electron acceleration in the same DC-electric field.
Proceedings of Kofu Symposium
- Pub Date:
- July 1994