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Long period oscillations of microwave emission of solar active regions: observations with NoRH and SSRT

Published online by Cambridge University Press:  01 September 2008

I. A. Bakunina ,
V. E. Abramov-Maximov ,
S. V. Lesovoy ,
K. Shibasaki ,
A. A. Solov'ev  and
Yu. V. Tikhomirov
I. A. Bakunina
Affiliation:
Radiophysical Research Institute, B. Pecherskaya st., 25, Nizhny Novgorod, 603950, Russia email: rinbak@mail.ru
V. E. Abramov-Maximov
Affiliation:
Central astronomical observatory at Pulkovo, Russian Acad. Sci., Pulkovskoe chaussee., 65/1, St. Petersburg, 196140, Russia email: beam@gao.spb.ru
S. V. Lesovoy
Affiliation:
Institute of Solar-Terrestrial Physics RAS SB, Lermontov St., 134, Irkutsk, 664033, Russia
K. Shibasaki
Affiliation:
Nobeyama Solar Radio Observatory, Minamimaki, Minamisaku, Nagano 384-1305, Japan
A. A. Solov'ev
Affiliation:
Central astronomical observatory at Pulkovo, Russian Acad. Sci., Pulkovskoe chaussee., 65/1, St. Petersburg, 196140, Russia email: beam@gao.spb.ru
Yu. V. Tikhomirov
Affiliation:
Radiophysical Research Institute, B. Pecherskaya st., 25, Nizhny Novgorod, 603950, Russia email: rinbak@mail.ru
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Abstract

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In this work we present the first results of study and comparison of the parameters of quasi-periodic long-term oscillations of microwave emission of large (>0.7 arcmin) sunspots as a result of simultaneous observations with two radioheliographs – NoRH (17 GHz) and Siberian Solar Radio Telescope (SSRT) (5.7 GHz) with 1 minute cadence. Radioheliographs have been working with quite large time overlap (about 5 hours) and have the high spatial resolution: 10 arcsec (NoRH) and 20 arcsec (SSRT). We have found that quasi-periodic long-term oscillations are surely observed at both frequencies with the periods in the range of 20–150 min. We detected common periods for common time of observations with two radioheliographs and interpret this as the consequence of the vertical-radial quasi-periodic displacements of sunspot as a whole structure.

Keywords

high angular resolutionoscillationsmagnetic fieldssunspots
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S257: Universal Heliophysical Processes , September 2008 , pp. 155 - 157
Copyright
Copyright © International Astronomical Union 2009

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