Universität zu Köln

Efimov, A. I., Lukanina, L. A., Rogashkova, A. I., Samoznaev, L. N., Chashei, I. V., Bird, M. K. and Paetzold, M. (2015). 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 (4). S. 313 - 327. NEW YORK: MAIK NAUKA/INTERPERIODICA/SPRINGER. ISSN 1562-6881

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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 Alfv,n 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 Alfv,n waves propagating in the circumsolar plasma.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Efimov, A. I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lukanina, L. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rogashkova, A. I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Samoznaev, L. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chashei, I. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bird, M. K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Paetzold, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-407936
DOI:	10.1134/S1063772915040022
Journal or Publication Title:	Astron. Rep.
Volume:	59
Number:	4
Page Range:	S. 313 - 327
Date:	2015
Publisher:	MAIK NAUKA/INTERPERIODICA/SPRINGER
Place of Publication:	NEW YORK
ISSN:	1562-6881
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CORONAL ALFVEN WAVES; OUTER SOLAR CORONA; INTERSTELLAR TURBULENCE; ACCELERATION REGION; CRAB-NEBULA; WIND; TRANSILLUMINATION; SUPERCORONA Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/40793