On the relationship between chromospheric oscillations of radio brightness at 1.76 cm with periods from minutes to hours and magnetic field changes

We present the results of Fourier and wavelet time series analysis for the high-cadence observations of an active region NOAA 8011, obtained with the Nobeyama Radioheliograph (NoRH) at the wavelength of 1.76 cm on 17.01.1997. Oscillations in brightness are found to be present with periods in the ran...

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Bibliographic Details
Published inProceedings of the International Astronomical Union Vol. 2004; no. IAUS223; pp. 281 - 282
Main Authors Loukitcheva, M.A., Gelfreikh, G.B., Nagnibeda, V.G.
Format Journal Article
LanguageEnglish
Published Cambridge, UK Cambridge University Press 01.06.2004
Subjects
Astronomy
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Summary:We present the results of Fourier and wavelet time series analysis for the high-cadence observations of an active region NOAA 8011, obtained with the Nobeyama Radioheliograph (NoRH) at the wavelength of 1.76 cm on 17.01.1997. Oscillations in brightness are found to be present with periods in the range from minutes to hours. The relationship between the active region oscillations in the microwave total intensity (I) and circular polarization (V) emission and changes of the magnetic field, deduced from the high-resolution magnetograms from MDI/SoHO, is investigated. We concentrate on the identification of different oscillation modes, the temporal behavior of the oscillations and the spatial distribution of different oscillating frequencies.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html
ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921304005939