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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: [email protected]
V. E. Abramov-Maximov
Affiliation:
Central astronomical observatory at Pulkovo, Russian Acad. Sci., Pulkovskoe chaussee., 65/1, St. Petersburg, 196140, Russia email: [email protected]
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: [email protected]
Yu. V. Tikhomirov
Affiliation:
Radiophysical Research Institute, B. Pecherskaya st., 25, Nizhny Novgorod, 603950, Russia email: [email protected]
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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

References

Durasova, M. S., Kobrin, M. M., & Yudin, O. I. 1971, Nature, 229, p. 83Google Scholar
Efremov, V. I., Parfinenko, L. D., & Solov'ev, A. A. 2007, Astron. Reports, 51, p. 401Google Scholar
Efremov, V. I., Parfinenko, L. D., & Solov'ev, A. A. 2008, J. Opt. Technol., 75, p. 144Google Scholar
Gelfreikh, G., Nagovitsyn, Yu. A, & Nagovitsyna, E. Yu. 2006, PASJ, 58, p. 29CrossRefGoogle Scholar
Kshevetskii, S. P. & Solov'ev, A. A. 2008, Astron. Rep., 52, p. 772CrossRefGoogle Scholar
Kosovichev, A. G. 2006, Adv. Sp. Res., 38, p. 876CrossRefGoogle Scholar
Kobrin, M. M., Pahomov, V. V., & Prokof'eva, N. A. 1976, Solar Phys., 50, p. 113CrossRefGoogle Scholar
Nagovitsyn, Yu. A. 1997, PAZ, 23, p. 859Google Scholar
Solov'ev, A. A. 1984, Solnechnye Dannye, p. 73Google Scholar
Solov'ev, A. A. 1984, Soviet Astron., 28, p. 447Google Scholar
Solov'ev, A. A. & Kirichek, E. A. 2006, in: Bothmer, V. & Hady, A. A. (eds.), Solar Activity and its Magnetic Origin, Proc. IAU Symposium No. 233 (Cairo, Egipt), p. 523Google Scholar
Solov'ev, A. A. & Kirichek, E. A. 2006, Astrophysical Bulletin, 63, p. 169Google Scholar
Torrence, C. & Compo, G. P. 1998, Bull. Amer. Meteor. Soc., 79, p. 61Google Scholar
Zhao, J., Kosovichev, A. G., & Duval, T. L. 2001, ApJ, 557, p. 384CrossRefGoogle Scholar