Impact Linear Polarization of the H α Line Observed in a Proton Flare with the Irkutsk Large Solar Vacuum Telescope

Physics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

3

Solar Flare, Spectrograph, Impact Polarization

Scientific paper

The impulsive phase of the 23 July 2002 2B/X4.8 proton flare with a classical two-ribbon structure was observed with the Irkutsk Large Solar Vacuum Telescope (LSVT) in spectropolarimetric mode, with high spatial, spectral, and time resolution. On the basis of 49 spectrograms and 1200 spectral cuts across the flare ribbons, evidence for H α line impact polarization has been obtained. A systematic change of the Stokes Q and U parameters has been detected across the ribbons for different flare regions measured with a scanning step of 0.85″. In the eastern side of the ribbons, the degree of polarization is 4 8%; its plane is oriented toward the solar disk center (radial direction). In the western side, the polarization degree runs up to 25%, and its plane is perpendicular to the disk center direction (tangential direction). A comparison of these results with hard X-ray data (RHESSI) allows us to conclude that high-energy electron beams reached the chromosphere during this flare. The observed changes of the direction of polarization and the vanishing polarization within the ribbons mean that, at the chromospheric level, the energy of electrons remaining in the beam is about 200 eV. A shift of the peak position of polarization relative to the intensity maximum in the ribbons may result from the inclination of the electron beam axis with respect to the solar surface.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Impact Linear Polarization of the H α Line Observed in a Proton Flare with the Irkutsk Large Solar Vacuum Telescope 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 Impact Linear Polarization of the H α Line Observed in a Proton Flare with the Irkutsk Large Solar Vacuum Telescope, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Impact Linear Polarization of the H α Line Observed in a Proton Flare with the Irkutsk Large Solar Vacuum Telescope will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1077359

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.