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1991 December 14 (M1.6)A GOES M1.6 solar flare occurred on 1991 December 14. 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 14:47 (53220 s), peaked at 14:51 (53460 s) and ended at 14:55 (53700 s) UT (GOES Geophysical Data Website). OSSE received a BATSE transient trigger at 53234 s but did not respond because the four OSSE detectors were involved in a complicated chopping procedure to observe the Galactic center. Fortunately, one of the detectors happened to be pointed at the scan-angle position of the Sun for the duration of the flare, and significant data were recorded by this detector. Significant emmission of up to about 1.0 MeV was observed during a ~175 s time interval (53235-53410 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 -3.7 below a break energy of ~195 keV to about -2.5 above the break energy fit the data better than a single power law. The total fluence above 50 keV was 303.9 +/- 5.2 photons cm-2. |
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