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1991 June 02 (M5.2)A GOES M5.2 solar flare occurred on 1991 June 02. The location of the flare on the Solar surface is not known due to lack of an accompanying H-alpha event. The soft X-ray flux began at 07:37 (27420 s), peaked at 07:46 (27960 s) and ended at 09:37 (34620 s) UT (GOES Geophysical Data Web Site). OSSE received a BATSE transient trigger at 27633 s and the four OSSE detectors slewed to the scan-angle position of the Sun. Two of the four detectors then initiated +/- 4.5 degree on-source-off-source viewing strategies while the other two detectors remained pointed at the Sun. Significant emission of up to about 300 keV was observed during a ~180 s time interval (27680-27860 s). Count rate time profiles in various energy windows at a temporal resolution of ~8 s are shown in Figure 1. A representative count spectrum is shown in Figure 2. A broken power law which hardened from an index of about -5.7 below a break energy of ~145 keV to about -3.1 above the break energy fit the data better than a single power law. The total fluence above 50 keV was 252.4 +/- 2.2 photons cm-2. |
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