Physics
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986crasb.303..153d&link_type=abstract
Academie des Sciences (Paris), Comptes Rendus, Serie II Mecanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Terre
Physics
2
Monochromatic Radiation, Monochromators, Photosphere, Solar Observatories, Polarizers, Solar Atmosphere, Solar Flares, Solar Magnetic Field, Sunspots, Velocity Distribution
Scientific paper
A spectral analysis was carried out of the physical processes occurring in the solar photosphere using images taken with an optical monochromator fitted with a polarizing filter. The scans were performed over the 5000 to 6600 A interval, with the images being derived using deconvolution techniques. The imagery were analyzed in terms of the depth of the spectral features, the structures of the the magnetic fields and the velocities of matter in motion within the photosphere. Several samples images are provided, showing, e.g., the Evershed effects as photospheric matter diverges around sunspots, the presence of a 450 gauss horizontal magnetic field extending over a 1000 km region, and a velocity gradient of 300 m/sec over the same region. These precursor conditions led to the onset of a chromospheric eruption 10-12 hr later.
Crussaire Daniel
Dollfus Audouin
Lioure Alain
Pernod E.
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