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- W2152364407 abstract "This paper reports the first comparison of hard X-ray (HXR), gamma-ray (GR), centimetric-millimetric and metric- decimetric spectral and imaging radio observations obtained during an electron-dominated gamma-ray burst. This impulsive event,which occurred on 1990 June 11 at 0943 UT, was as- sociated with a H 2B flare, located close to the disk center. The time evolution of the HXR emission consists of successive peaks of 10 s duration. Several of these peaks show GR emis- sion up to a few MeV and one of them up to 56 MeV. For each of these peaks, the photon spectrum significantly hardens above a break energy varying in the 0.4-0.7 MeV range. No sig- nificant GR line (GRL) emission is detected. The main results of our analysis are: (i) even if no significant GRL emission is detected, the upper limit of the energy content in > 1MeV/nucl. ions is comparable with the energy content in > 20 keV elec- tron s(af ew 10 29 ergs), as it is found for GRL flares; (ii) during the whole event, the centimetric-millimetric emission is radiated by > 0.4-0.7 MeV electrons which have been accelerated since the very beginning of the flare; (iii) the different HXR/GR peaks are associated with step-wise changes of the magnetic structures to which metric-decimetric radio producing electrons have ac- cess. This latter characteristic of the 1990 June 11 burst is glob- ally similar to the behaviour reported in the literature for GRL events, but the energy in accelerated particles is about one order of magnitude lower. Finally, the electron-dominated emitting peak with emission up to 56 MeV is interpreted as a signa- ture of an upward moving population of relativistic electrons which is strongly beamed along the magnetic field and which does not contribute significantly to the centimetric-millimetric and < 0.2 MeV HXR emissions. The metric-decimetric radio observations indicate that this happens when electrons have sud- denly access to large-scale magnetic structures." @default.
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- W2152364407 date "1998-06-01" @default.
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- W2152364407 title "A multiwavelength analysis of an electron-dominated gamma-ray event associated with a disk solar flare" @default.
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