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1997 November 28 (M6.8)

A GOES M6.8 solar flare occurred on 1997 November 28 at an H-alpha location of N15E61 (heliographic coordinates). The soft X-ray flux began at 04:56 (17760 s), peaked at 05:06 (18360 s), and ended at 06:33 (23580 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 observations, it was fortunately within 1 degree of a detector axis during the period of emission.

Significant emission up to about 200 keV was observed during two ~131 s data accumulation intervals (17955-18086, 18086-18217 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 165.1 +/- 6.3 photons cm-2.

Figure 1

Figure 2

Last revised: 11 Dec 1997