Search for evidence of low energy protons in solar flares

Computer Science

Scientific paper

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Emission Spectra, H Alpha Line, Linear Polarization, Polarimeters, Proton Energy, Solar Flares, Solar Protons, Solar X-Rays, Charge Coupled Devices, Field Of View, Gamma Ray Observatory, Imaging Techniques, Scanners, Solar Observatories, Solar Spectra, Spectrographs

Scientific paper

We searched for linear polarization in the H alpha line using the Stokes Polarimeter at Mees Solar Observatory and present observations of a flare from NOAA active region 6659 which began at 01:30 UT on 14 Jun. 1991. Our dataset also includes H alpha spectra from the Mees charge coupled device (MCCD) imaging spectrograph as well as hard x ray observations from the Burst and Transient Source Experiment (BATSE) instrument on board the Gamma Ray Observatory (GRO). The polarimeter scanned a 40 x 40 inch field of view using 16 raster points in a 4 x 4 grid. Each scan took about 30 seconds with 2 seconds at each raster point. The polarimeter stopped 8.5 inches between raster points and each point covered a 6 inch region. This sparse sampling increased the total field of view without reducing the temporal cadence. At each raster point, an H alpha spectrum with 20 mA spectral sampling is obtained covering 2.6 A centered on H alpha line center. The preliminary conclusions from the research are presented.

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