Abstract
Yohkoh observed a large solar flare (X9/2B) on November 6, 1997. The flare showed strong gamma-ray emission between 11:52 and 11:56 UT (peak phase) and several gamma-ray lines were detected. After 11:56 UT a weak and extended gamma-ray emission was measured. The ratio of Mg+Si+Fe to C+O+Ne line fluxes was enhanced by a factor of about three in the extended phase. The Oriented Scintillation Spectrometer Experiment ( OSSE) on board the Compton Gamma-Ray Observatory (CGRO) detected significant neutrons associated with the flare between 12:08 and 12:30 UT. The observed neutron count-rate time profile suggests that neutrons originated in interactions that occurred in both peak and extended phases.
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