Observations of preburst heating and magnetic field changes in a coronal loop at 20 cm wavelength |
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Authors: | Robert F. Willson |
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Affiliation: | (1) Department of Physics, Tufts University, 02155 Medford, MA, U.S.A. |
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Abstract: | The Very Large Array (VLA) has been used at 20 cm wavelength to study the evolution of a burst loop with 4 resolution on timescales as short as 10 s. The VLA observations show that the coronal loop began to heat up and change its structure about 15 min before the eruption of two impulsive bursts. The first of these bursts occurred near the top of the loop that underwent preburst heating, while the second burst probably occurred along the legs of an adjacent loop. These observations evoke flare models in which coronal loops twist, develop magnetic instabilities and then erupt. We also combine the VLA observations with GOES X-ray data to derive a peak electron temperature of Te = 2.5 × 107 K and an average electron density of Ne 1 × 1010 cm–3 in the coronal loop during the preburst heating phase. |
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