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1999 May 10 (M2.5)

A GOES M2.5 solar flare occurred on 1999 May 10 at an H-alpha location of N16E19 (heliographic coordinates). The soft X-ray flux began at 05:22 (19320 s), peaked at 05:31 (19860 s) and ended at 05:37 (20220 s) UT (GOES Geophysical Data Web Site). OSSE received a BATSE transient trigger at 19579 s but since the Sun was the primary OSSE target during this period, the four OSSE detectors were already performing +/- 4.5 degree on-source-off-source viewing strategies at the scan-angle position of the Sun.

Significant emmission of up to about 400 keV was observed during a ~315 s time interval (19465-19780 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. A single power law with an index of about -3.7 was used to fit the data. The total fluence above 50 keV was 310.7 +/- 6.6 photons cm-2.

Figure 1

Figure 2

Last revised: 27 Jul 1999