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2000 May 01 (M1.1)
A GOES M1.1 solar flare occurred on 2000 May 01 at an H-alpha location of N20W61 (heliographic coordinates). The soft X-ray flux began at 10:16 (36960 s), peaked at 10:27 (37620 s) and ended at 10:34 (38040 s) UT (GOES Geophysical Data Web Site). The Sun was an OSSE target during this period with the four detectors performing +/- 4.5 degree on-source-off-source viewing strategies. Three of the four detectors were pointed within 2.5 degrees of the Sun during the event. A data outage prevented observation of the first few seconds of the rise of the flare, but the bulk of the emission was detected.
Significant emission of up to ~500 keV was observed during an ~160 s time interval (37284-37448 s). Count rate time profiles in various energy windows at a temporal resolution of ~8 s are shown in Figure 1. A representative count spectrum is shown in Figure 2. A unbroken power law with an index of ~3.6 provided an adequate fit to the data. The total fluence above 50 keV was 524 +/- 5 photons cm-2.
 Figure 1 |
 Figure 2 |