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1991 June 09 (M1.4)

A GOES M1.2 solar flare occurred on 1991 June 09 at an H-alpha location of N28W04 (heliographic coordinates). The soft X-ray flux began at 13:05 (47100 s), peaked at 13:19 (47940 s) and ended at 13:27 (48420 s) UT (GOES Geophysical Data Web Site). OSSE received a BATSE transient trigger at 47189 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 emmission of up to about 200 keV was observed during a ~120 s time interval (47170-47290 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 -4.6 was used to fit the data. The total fluence above 50 keV was 125.4 +/- 1.5 photons cm-2.

Figure 1

Figure 2

Last revised: 19 Jul 1999