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1991 June 08 (C2.6)

A GOES C2.6 solar flare occurred on 1991 June 08 at an H-alpha location of N32E16 (heliographic coordinates). The soft X-ray flux began at 04:11 (15060 s), peaked at 04:15 (15300 s) and ended at 04:17 (15420 s) UT (GOES Geophysical Data Web Site). OSSE received a BATSE transient trigger at 15182 s but did not respond because 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 100 keV was observed during a ~75 s time interval (15170-15245 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 -5.0 was used to fit the data. The total fluence above 50 keV was 9.0 +/- 0.8 photons cm-2.

Figure 1

Figure 2

Last revised: 28 Jul 1999