Active region oscillations

Details Active region oscillations Active region oscillations

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.464..223o&link_type=abstract

In: Proceedings of the SOHO 10/GONG 2000 Workshop: Helio- and asteroseismology at the dawn of the millennium, 2-6 October 2000,

Physics

Solar Active Regions, Sun, Uv Radiation, Transition Region, Corona, Oscillations

Scientific paper

We report here on an investigation of high frequency oscillations in active regions, carried out using high cadence observations of O V 629 Å, Mg IX 368 Å and Fe XVI 335 Å with the Coronal Diagnostic Spectrometer (CDS) on SoHO. Using the techniques of wavelet analysis on various temporal series datasets, we find that certain bands of oscillation frequency are favoured for each line. We report on the tendency for higher frequency oscillations to correspond to lower intensity values, suggesting that higher frequency oscillations occur in inter-loop regions or at loop boundaries, and further that some resonant absorption process is perhaps at work at these locations. We suggest that there are two possible mechanisms for the observed oscillations; either resonant Alfvén waves or resonant fast kink waves in coronal loops.

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