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Polarization changes with time during solar microwave impulsive bursts

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Abstract

The evolution with time of circular polarization π(t) from solar bursts at 7 GHz presents, in the majority of cases, a polarization degree peak before the maximum flux time. The subsequent evolution of π(t) is continuous and usually increasing. The changes could be caused by superimposed polarization effects, due to the fast emissive electrons (dominant in the first phase), and to the propagation effects caused by the coronal condensation where the event occurred (dominant in the second phase). In an approximate approach, π(t) is connected to the movement of the source in the second phase, being qualitatively sound, but limited to the lack of knowledge on acceleration processes and on magnetic field topology in the active region where the flares take place.

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Authors and Affiliations

  1. Centre of Radio Astronomy and Astrophysics, Mackenzie University, São Paulo, Brasil

    Pierre Kaufmann, Oscar T. Matsuura & P. Marques Dos Santos

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  1. Pierre Kaufmann
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  2. Oscar T. Matsuura
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  3. P. Marques Dos Santos
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Kaufmann, P., Matsuura, O.T. & Dos Santos, P.M. Polarization changes with time during solar microwave impulsive bursts. Sol Phys 14, 190–195 (1970). https://doi.org/10.1007/BF00240177

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