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- W2506800891 abstract "Abstract We present gamma-ray observations of the 1991 October 27, November 15, and December 3 flares with the Yohkoh gamma-ray and hard X-ray spectrometers. The October 27 flare (X6.1 /3B) shows significant gamma-ray line emission, and the temporal evolution of the gamma-ray line-to-bremsstrahlung flux ratio indicates that protons and electrons were complicatedly accelerated during flare. The December 3 flare (X2.0/2B) shows a strong bremsstrahlung continuum extending to 10 MeV and indicates that electrons were preferentially accelerated to 10 MeV. A line feature at 420 keV was observed from the November 15 flare (X1.0/3B). This is most likely due to a compound of redshifted nuclear deexcitation lines of Be (429 keV) and Li (478 keV) resulting from He-He reactions. The spectral feature indicates that the accelerated He nuclei suffer strong pitch-angle scattering in the corona and form a downward-peaked distribution. Furthermore, the November 15 flare exhibits evidence of positron annihilation line at 511 keV. The positron production processes and the electron density of the annihilation region are discussed on the basis of the temporal characteristics of 511 keV line emission. Subject headings : line: identification — Sun: flares — Sun: X-rays, gamma-rays" @default.
- W2506800891 created "2016-08-23" @default.
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- W2506800891 date "1994-01-01" @default.
- W2506800891 modified "2023-09-24" @default.
- W2506800891 title "Gamma-Ray Spectral Observations with Yohkoh" @default.
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- W2506800891 doi "https://doi.org/10.1017/s0252921100077915" @default.
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