Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...587..806m&link_type=abstract
The Astrophysical Journal, Volume 587, Issue 2, pp. 806-817.
Astronomy and Astrophysics
Astronomy
31
Magnetohydrodynamics: Mhd, Sun: Chromosphere, Sun: Magnetic Fields, Sun: Oscillations, Sun: Photosphere
Scientific paper
Oscillations in network bright points (NBPs) are studied at a variety of chromospheric heights. In particular, the three-dimensional variation of NBP oscillations is studied using image segmentation and cross-correlation analysis between images taken in light of Ca II K3, Hα core, Mg I b2, and Mg I b1-0.4 Å. Wavelet analysis is used to isolate wave packets in time and to search for height-dependent time delays that result from upward- or downward-directed traveling waves. In each NBP studied, we find evidence for kink-mode waves (1.3, 1.9 mHz), traveling up through the chromosphere and coupling with sausage-mode waves (2.6, 3.8 mHz). This provides a means for depositing energy in the upper chromosphere. We also find evidence for other upward- and downward-propagating waves in the 1.3-4.6 mHz range. Some oscillations do not correspond to traveling waves, and we attribute these to waves generated in neighboring regions.
Bloomfield Shaun D.
Gallagher Peter. T.
Keenan Francis P.
Mathioudakis Mihalis
McAteer James R. T.
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