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1999 December 03 (C6.3)

A GOES M1.4 solar flare occurred on 1999 December 03 at an H-alpha location of S15W65 (heliographic coordinates). The soft X-ray flux began at 19:48 (71280 s), peaked at 19:53 (71580 s), and ended at 19:55 (71700 s) UT (GOES Geophysical Data Web Site). OSSE received a BATSE solar-flare trigger at 71471 s and the OSSE detectors slewed to the scan-angle position of the Sun and initiated standard on-source-off-source viewing strategies. Solar observations began at 71470 s UT.

Significant gamma-ray emission to ~200 keV was observed lasting until about 71540 s UT with one peak of emmision at ~71520. 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 71496-71545 s UT (49 seconds). The electron bremsstrahlung component was well-fit with a simple power law having a spectral index of ~2.79. There was no evidence for nuclear lines.

Figure 1

Figure 2

Last revised: 11 Dec 1997