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1991 November 13 (M1.3)

A GOES M1.3 solar flare occurred on 1991 November 13. 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 21:13 (76380 s), peaked at 21:26 (77160 s) and ended at 21:31 (77460 s) UT (GOES Geophysical Data Web Site). OSSE received a BATSE transient trigger at 76557 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. Because of the extreme DSA-angle of the Sun, however, the views of the top two detectors were obstructed and significant data were recorded by only the bottom two detectors.

Significant emmission of up to about 200 keV was observed during a ~135 s time interval (76565-76700 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 single power law with an index of about -4.8 was used to fit the data. The total fluence above 50 keV was 415.7 +/- 5.6 photons cm-2.

Figure 1

Figure 2

Last revised: 16 Jul 1999