Physics
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aipc..294..171m&link_type=abstract
High energy solar phenomena-A new ear of spacecraft measurements. AIP Conference Proceedings, Volume 294, pp. 171-176 (1994).
Physics
10
Scientific paper
SMM/GRS-observations of the initial impulsive phase of the solar flare on 6 March 1989 are well suited for the study of temporal and spectral variations of bremsstrahlung caused by relativistic electrons. The bemsstrahlung-dominated spectra of the impulsive bursts are unique among gamma-ray spectra due to the strong electronic continua above 1 MeV. By estimating the nuclear contributions from narrow de-excitation lines, we find that the bremsstrahlung can be roughly approximated by power laws with spectral indices as low as n=1.5. This continuum extends to higher energies showing an exponential cutoff at several tens of MeV. Between 0.3 and 0.8 MeV, the spectra are steeper and can be well described by power laws with indices between n=2.4 and n=3.0. The degree of spectral flattening, losing its significance at later bursts, seems not to be correlated with the intensity of the radiation <1 MeV. Ions are accelerated throughout the whole flare, even well before the onset of the intense bursts. The typical line structure however is suppressed by the dominant continuum during the initial bursts.
Kanbach Gottfried
Marschhäuser Holger
Rieger Erich
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