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1991 June 07 (M1.3)

A GOES M1.3 solar flare occurred on 1991 June 07 at an H-alpha location of N08W09 (heliographic coordinates). The soft X-ray flux began at 06:12 (22320 s), peaked at 06:15 (22500 s) and ended at 06:56 (24960 s) UT (GOES Geophysical Data Website). OSSE received a BATSE transient trigger at 22357 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. 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 emission of up to about 300 keV was observed during a ~105 s time interval (22375-22480 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 -3.3 was used to fit the data. The total fluence above 50 keV was 34.4 +/- 1.6 photons cm-2.

Figure 1

Figure 2

Last revised: 13 Jul 1999