Detection of propagating waves throughout the chromosphere in network bright points

Details Detection of propagating waves throughout the chromosphere in network bright points Detection of propagating waves throughout the chromosphere in network bright points

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.505..305m&link_type=abstract

In: SOLMAG 2002. Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 Jun

Physics

Oscillations, Chromosphere, Photosphere, Mhd Waves

Scientific paper

We analysed oscillations in individual Network Bright Points (NBPs) in Ca II K3, Hα core, Mg I b2, and Mg I b1-0.4 Å giving us a range of heights from the upper to the lower chromosphere. Lightcurves, and hence power spectra, were created by isolating distinct regions of the NBP via a simple intensity thresholding technique. Using this technique, it was possible to identify peaks in the power spectra with particular spatial positions within the NBPs. This was extended into the time domain by means of wavelet analysis. We track the temporal evolution of power in particular frequency bands by creating power curves. These are then cross-correlated across all observed wavelengths to search for propagating waves. In particular, long-period waves with periods of 4-15 minutes (1-4 mHz) were found in the central portion of each NBP, indicating that these waves are certainly not acoustic, but possibly due to magneto-acoustic or magneto-gravity wave modes. We note the possible existence of fast-mode MHD waves in the lower chromosphere, coupling and transferring power top higher-frequency slow-mode MHD waves in the upper chromosphere.

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