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1997 December 01 (M1.2)

A GOES M1.2 solar flare occurred on 1997 December 1 at an H-alpha location of N19E27 (heliographic coordinates). The soft X-ray flux began at 02:32 (9120 s), peaked at 02:37 (9420 s), and ended at 02:47 (10020 s) UT (GOES Geophysical Data Web Site). OSSE received a BATSE transient trigger at 17759 s but, because the source position calculated on-board was outside the acceptance window for a solar source, OSSE did not respond except to alter some data collection parameters. However, because the Sun was in the region of sky covered by the current celestial observations, it was fortunately within 1 degree of a detector axis during the period of emission.

Significant emission up to about 150 keV was observed during one ~131 s data accumulation interval (9240-9387 s). Count rate time profiles in various energy windows at a temporal resolution of ~16 s are shown in Figure 1. A representative count spectrum is shown in Figure 2. The total fluence above 50 keV was 48.0 +/- 1.6 photons cm-2.

Figure 1

Figure 2

Last revised: 11 Dec 1997