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2000 April 08 (M1.8)

A GOES M1.8 solar flare occurred on April 8, 2000 at an H-alpha location of S14E19 (heliographic coordinates). The soft X-ray flux began at 20:41 (74460 s), peaked at 20:47 (74820 s), and ended at 21:42 (78120 s) UT (GOES Geophysical Data Web Site). OSSE received a BATSE solar-flare trigger at 74696 s and the four OSSE detectors slewed to the scan-angle position of the Sun and initiated standard on-source-off-source viewing strategies. Solar observations began at 74700 s UT.

Significant gamma-ray emission to ~200 keV was observed lasting until about 4800 s UT with one peak of emission at 74750 s. Count rate time profiles in various energy windows at a temporal resolution of ~8 s are shown in Figure 1. Figure 2 shows a representative count spectrum obtained from one Sun-pointed detector integrated over the time period 74712-74761 s UT (49 seconds). The electron bremsstrahlung component was well-fit with a simple power law having a spectral index of ~4.3. There was no evidence for nuclear lines.

Figure 1

Figure 2

Last revised: 11 Dec 1997