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Analysis of coronal magnetic fields in active regions based on detailed radio spectral data

Published online by Cambridge University Press:  01 November 2006

S. Tokhchukova ,
V. Bogod  and
V. Garaimov
S. Tokhchukova
Affiliation:
Main (Pulkovo) Astronomical Observatory of RAS, St.Petersburg, 196140, Russia email: [email protected] Present address: Main (Pulkovo) Astronomical, 196140, St.Petersburg, Russia
V. Bogod
Affiliation:
Special Astrophysical Observatory of RAS, Nizhnij Arkhyz, 369147, Russia email: [email protected]
V. Garaimov
Affiliation:
Special Astrophysical Observatory of RAS, Nizhnij Arkhyz, 369147, Russia email: [email protected]
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Abstract

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Here we present an analysis of microwave emission spectra from flare-productive active regions (FPAR). For that we used regular observations in a wide frequency range with high spectral resolution and polarization sensitivity made with the RATAN-600 radio telescope. The multi-frequency observations make possible to detect small changes of magnetic field structures at different heights of the solar atmosphere. Observations with RATAN-600 and other large radio heliographs revealed an existence of narrow-band irregularities in the circular polarization spectra of FPARs radio emission. The new receiver complex, recently installed at RATAN-600, significantly improves its technical capabilities for the FPARs further study. Now it provides 1% (or 100 MHz) resolution in the frequency range from 6 GHz to 18 GHz in simultaneous registration. We present some observational results obtained with this new equipment.

Keywords

Sun: activitycoronachromosphereflarespolarizationmagnetic fieldsradio radiation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S233: Solar Activity and its Magnetic Origin , March 2006 , pp. 100 - 103
Copyright
© 2006 International Astronomical Union