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2000 January 02 (C5.1)

A GOES C5.1 solar flare occurred on 2000 January 02 at an H-alpha location of S15E03 (heliographic coordinates). The soft X-ray flux began at 22:20 (80400 s), peaked at 22:27 (80820 s), and ended at 22:37 (81420 s) UT (GOES Geophysical Data Web Site). OSSE received a BATSE solar-flare trigger at 80635 s and the OSSE detectors slewed to the scan-angle position of the Sun and initiated a standard on-source-off-source viewing strategy. Solar observations began at 80650 s UT.

Significant gamma-ray emission to ~700 keV was observed lasting until about 80750 s UT with two peaks of emission at ~80670 and ~80720 s. A data outage occurred while the events was decaying. 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 80657-80935 s UT (278 seconds). The electron bremsstrahlung component was well-fit with a simple power law having a spectral index of ~3.73. There was no evidence for nuclear lines.

Figure 1

Figure 2

Last revised: 20 July 2000