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Quasi periodic oscillations of solar active regions in connection with their flare activity - NoRH observations  

Vladimir Abramov-Maximov   Submitted: 2011-07-11 16:24

This abstract was corrupted following database problems and is being recovered. It will be restored as quickly as possible. Any questions, please send them to Alisdair. Sorry for any incovenience.


Authors: Vladimir Abramov-Maximov, George Gelfreikh, Kiyoto Shibasaki
Projects: Nobeyama Radioheliograph

Publication Status: Solar Physics, Volume 273, Number 2, pp.403-412, DOI: 10.1007/s11207-011-9822-6
Last Modified: 2011-11-17 09:28
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Multilevel Analysis of Oscillation Motions in Active Regions of the Sun  

Vladimir Abramov-Maximov   Submitted: 2011-02-08 04:48

We present a new method that combines the results of an oscillation study made in optical and radio observations. The optical spectral measurements in photospheric and chromospheric lines of the line-of-sight velocity were carried out at the Sayan Solar Observatory. The radio maps of the Sun were obtained with the Nobeyama Radioheliograph at 1.76 cm. Radio sources associated with the sunspots were analyzed to study the oscillation processes in the chromosphere-corona transition region in the layer with magnetic field B=2000 G. A high level of instability of the oscillations in the optical and radio data was found. We used a wavelet analysis for the spectra. The best similarities of the spectra of oscillations obtained by the two methods were detected in the three-minute oscillations inside the sunspot umbra for the dates when the active regions were situated near the center of the solar disk. A comparison of the wavelet spectra for optical and radio observations showed a time delay of about 50 seconds of the radio results with respect to optical ones. This implies a MHD wave traveling upward inside the umbral magnetic tube of the sunspot. Besides three-minute and five-minute ones, oscillations with longer periods (8 and 15 minutes) were detected in optical and radio records.

Authors: V.E. Abramov-Maximov, G.B. Gelfreikh, N.I. Kobanov, K. Shibasaki, S.A. Chupin
Projects: None

Publication Status: Solar Physics, accepted (18 Jan 2011)
Last Modified: 2011-02-08 08:48
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Multilevel Analysis of Oscillation Motions in Active Regions of the Sun  

Vladimir Abramov-Maximov   Submitted: 2011-02-08 04:48

This abstract was corrupted following database problems and is being recovered. It will be restored as quickly as possible. Any questions, please send them to Alisdair. Sorry for any incovenience.


Authors: V.E. Abramov-Maximov, G.B. Gelfreikh, N.I. Kobanov, K. Shibasaki, S.A. Chupin
Projects:

Publication Status: Solar Physics, volume 270, pp. 175-189, 2011
Last Modified: 2011-07-08 08:00
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Quasi periodic oscillations of solar active regions in connection with their flare activity - NoRH observations
Multilevel Analysis of Oscillation Motions in Active Regions of the Sun
Multilevel Analysis of Oscillation Motions in Active Regions of the Sun

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