Observations and discussions concerning ‘high’ polarization features in the solar corona |
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Authors: | Serge Koutchmy Kenneth H Schatten |
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Institution: | (1) Institute d'Astrophysique, 98Bis-Boulevard Arago, 14E Paris, France;(2) Laboratory for Extraterrestrial Physics, NASA-Goddard Space Flight Center, Greenbelt, Maryland, USA |
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Abstract: | Photographic observations were obtained of the radial and tangential polarization of the solar corona for the 1970, March
7, solar eclipse. The corona was photographed using a neutral density filter and rotating linear polaroid sectors to allow
the polarization structure to be seen from 1 to 6 solar radii. Anomalously high polarizations were found for structures with
the E-tangential intensity being predominantly larger than the E-radial intensity. These structures are generally filamentary in nature and radial in direction. One case with a high radial
polarization was also found. The photographs were calibrated accurately against the Earth shine from the Moon. Possible source
mechanisms are discussed that may explain this new component in the solar corona. Most sources may be ruled out on physical
grounds. One possibility appears to be synchrotron radiation from 10 GeV electrons in a 0.4 G field. The existence of these
electrons, however, is unlikely in that spacecraft observations at 1 AU do not confirm their presence. |
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