Recent Advances in Solar Physics at VIRAC:

Analysis of Solar Active Regions on the Base of

Microwave ObservationsD. Bezrukov

Ventspils International Radio Astronomy Center

LATVIA

Tartu 2011

Coronal Magnetography through Quasi-Transverse Propagation of Microwaves

Analysis of a Stable Sunspot with Sharp Changes in Ordinary Mode Radiation at Microwaves

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Coronal Magnetography through Quasi-Transverse Propagation of Microwaves

Ryabov, B.I., Pilyeva, N.A., Alissandrakis C.E., Shibasaki, K., Bogod, V.M., Garaimov, V.I., Gelfreikh, G.B. 1999, Solar Phys., 185, 157

Bezrukov D.A., Ryabov B.I., Bogod V.M., Gelfreikh G.B., and all, “On the technique of coronal magnetography through quasi-transverse propagation of microwaves”, Baltic Astronomy, 2005, vol.14, N 1, pp.83-103

B.I. Ryabov, V.M. Bogod, G.B. Gelfreikh, V.P. Maksimov, F. Drago, B.I. Lubyshev, N.G. Peterova, T.P. Borisevich, D.A. Bezrukov, “Coronal magnetograms of solar active regions”, Multi-Wave Investigations of Solar Activity Proceedings IUA Symposium, No. 223, 2004.

QTR

Time dependence of polarization inversion fits the model properties of QT-region. NOAA 9068

NoRH maps & KPNO magnetograms

Model prediction of QT-region

daily coronal magnetograms of the NOAA 9068

Daily 2D coronal magnetograms of the NOAA 9068

3D QT-surface positions determined at B=21 Gs for NOAA 9415

Model Analysis of a Stable Sunspot with Sharp Changes in Ordinary Mode Radiation at

Microwaves

AR 10325 during March 30 - April 2, 2003 RATAN-600 r.c.p. (red) and l.c.p. (blue)

λ = 2.24 cm 2.32 cm 2.67 cm 2.74 cm

March 30

March 31

April 1

April 2

AR 10325 on March 31, April 2 and 4 of 2003 Nobeyama Radio Heliograph (r.c.p. and l.c.p.)

AR 10325 on 2003 April 2 SOHO CDS (EUV lines) over MDI (white light)

D. A. Bezrukov, B. I. Ryabov, N. G. Peterova, N. A. Topchilo, “Sharp Changes in the Ordinary Mode Microwave Emission from a Stable Sunspot: Model Analysis”, Latvian

Journal of Physics and Technical Sciences, 2011, N 2

Solar Observations by VIRAC RT-32 Radio Telescopecurrent status

VIRAC radio telescope RT-322 channels x 16 sub bands spectral polarimeter for 6.3-9.3 GHz band

Time-wavelength chart overlapping for NoRH, SSRT, RATAN-600 and VIRAC RT-32

Thank you!