A multiwavelength analysis of an electron-dominated gamma-ray event associated with a disk solar flare

Details A multiwavelength analysis of an electron-dominated gamma-ray event associated with a disk solar flare A multiwavelength analysis of an electron-dominated gamma-ray event associated with a disk solar flare

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...334.1099t&link_type=abstract

Astronomy and Astrophysics, v.334, p.1099-1111 (1998)

Astronomy and Astrophysics

Astrophysics

37

Sun: Activity, Sun: Flares, Sun: Particle Emission, Sun: Radio Radiation

Scientific paper

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 associated with a Halpha 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 emission 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 significant 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 electrons ( a few 10(29) ergs), as it is found for GRL flares; (ii) during the whole event, the centimetric-millimetric emission is radiated by ga 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 access. This latter characteristic of the 1990 June 11 burst is globally 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 signature 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 la 0.2 MeV HXR emissions. The metric-decimetric radio observations indicate that this happens when electrons have suddenly access to large-scale magnetic structures.

Affiliated with

Also associated with

No associations

Rating

A multiwavelength analysis of an electron-dominated gamma-ray event associated with a disk solar flare does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A multiwavelength analysis of an electron-dominated gamma-ray event associated with a disk solar flare, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A multiwavelength analysis of an electron-dominated gamma-ray event associated with a disk solar flare will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1330169