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Faraday-rotation fluctuations from radio-sounding measurements of the circumsolar plasma using polarized signals from the HELIOS-1 and HELIOS-2 space probes

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Abstract

Fluctuations in the Faraday rotation of the plane of polarization of S-band (2.3 GHz) radio signals transmitted through the solar corona by the HELIOS-1 AND HELIOS-2 space probes are analyzed. Simultaneous measurements of the Faraday-rotation fluctuations at the Goldstone and Canberra stations have yielded estimates of the velocity of perturbations of the magnetic field in the circumsolar plasma at heliocentric distances of three to six solar radii. The velocity of these perturbations is a combination of the Alfvén and solar-wind speeds. Temporal spectra of the Faraday-rotation fluctuations are obtained based on a large volume of observational data obtained in various years in four cycles of radio-sounding experiments. Filtration of the input data using spectral, correlation, and wavelet analyses shows that trains of quasi-periodic oscillations of the magnetic field with various amplitudes and periods from 2 to 160 min are regularly present in the Faraday-rotation fluctuations. This quasi-periodic character of these perturbations supports their connection with Alfvén waves propagating in the circumsolar plasma.

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Authors and Affiliations

  1. Fryazino Branch of the Kotel’nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Fryazino, Moscow region, 141190, Russia

    A. I. Efimov, L. A. Lukanina, A. I. Rogashkova & L. N. Samoznaev

  2. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russia

    I. V. Chashei

  3. Argelander Institute for Astronomy, University of Bonn, Bonn, Germany

    M. K. Bird

  4. Rhenish Institute for Environmental Research, University of Cologne, Cologne, Germany

    M. K. Bird & M. Paetzold

Authors
  1. A. I. Efimov
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  2. L. A. Lukanina
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  3. A. I. Rogashkova
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  4. L. N. Samoznaev
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  5. I. V. Chashei
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  6. M. K. Bird
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  7. M. Paetzold
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Correspondence to A. I. Efimov.

Additional information

Original Russian Text © A.I. Efimov, L.A. Lukanina, A.I. Rogashkova, L.N. Samoznaev, I.V. Chashei, M.K. Bird, M. Paetzold, 2015, published in Astronomicheskii Zhurnal, 2015, Vol. 92, No. 4, pp. 350–364.

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Efimov, A.I., Lukanina, L.A., Rogashkova, A.I. et al. Faraday-rotation fluctuations from radio-sounding measurements of the circumsolar plasma using polarized signals from the HELIOS-1 and HELIOS-2 space probes. Astron. Rep. 59, 313–326 (2015). https://doi.org/10.1134/S1063772915040022

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  • DOI: https://doi.org/10.1134/S1063772915040022

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