Directivity of HXR Solar Flare Emission Obtained from Stereoscopic Observations by Mars Odyssey (HEND), RHESSI and CORONAS-F (SONG)
Abstract
Two powerful X-Ray flares were observed on 2005, July 14 by three spacecrafts whose heliolon-gitudes were spaced on 39 degrees. The flares were observed, as projected on the solar disc by Mars Odyssey (HEND) and seeing almost directly on the limb by RHESSI and CORONAS-F. The most intensive hard X-ray and gamma-ray flare (up to 2 MeV) was observed by HEND and SONG on 07:23 UT, and measured time profiles were similar, but the spectra were quite rather different. Particular pulses of flares were studied by data from different instruments with dif-ferent heliolongitudes, and conclusion was drawn that difference between fluxes at these flares is more likely due to a directivity of radiation. The emission directivity was more clearly seen for the source at the top of flare loop for burst observed near 11:00 UT.
- Publication:
-
38th COSPAR Scientific Assembly
- Pub Date:
- 2010
- Bibcode:
- 2010cosp...38.2984L