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1991 June 10 (M1.2)

A GOES M1.2 solar flare occurred on 1991 June 10 at an H-alpha location of N28W20 (heliographic coordinates). The soft X-ray flux began at 10:57 (39420 s), peaked at 11:05 (39900 s) and ended at 11:15 (40500 s) UT (GOES Geophysical Data Web Site). OSSE received a BATSE transient trigger at 39545 s but the four OSSE detectors were already pointed at the scan angle of the Sun. Two of the four detectors performed +/- 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 150 keV was observed during a ~225 s time interval (39510-39735 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 -6.0 was used to fit the data. The total fluence above 50 keV was 85.0 +/- 2.0 photons cm-2.

Figure 1

Figure 2

Last revised: 30 Jul 1999