OSSE SOLAR FLARE OBSERVATIONS     

Detected flares are listed in the following table by date, approximate peak emission time (UT), and GOES X-ray classification. Preliminary fluences (time-integrated fluxes) are provided where emission is observed. Listed are (1) >50 keV fluence of the electron bremsstrahlung power law, (2) >300 keV fluence of the power law, (3) summed fluence in narrow nuclear lines greater than 1 MeV, (4) fluence in the 2.223 MeV neutron-capture line, and (5) fluence above 16 MeV. All fluences are photons cm^-2. Because of earth occultation or missing data, some fluences are not accumulated over the entire flare.

Clicking on a flare date will open a page containing a brief description of the flare and the OSSE observations along with a plot of count-rate time profiles in various energy bands and a plot of the observed count spectrum. The time profiles are for the following energy windows: 0.05 - 0.1, 0.1 - 0.3, 0.3 - 0.8, 0.8 - 1.5, 1.5 - 3.0, 3.0 - 10.0, and >16 MeV. The total shield count rate is also shown which corresponds to emission above ~150 keV. (Note: The lowest-energy profile may not accurately represent the true profile since no attempt to correct for possible wrapping of the PHA channels has been made.) Clicking on either plot will download a PostScript version.

We emphasize that these data are preliminary. For most of the flares listed here, the subtracted background was derived using data obtained during 60-sec intervals prior to and after the flare interval. For long-duration flares occurring when the background is rapidly changing, this can result in spurious high-energy continuum.

(1) These quantities are not determined because the Sun was off-axis and the fit was performed only on >1 MeV data.

(4) Fluence >100 keV