Bibcode
Centeno, R.; Collados, M.; Trujilo-Bueno, J.
Bibliographical reference
"Modern solar facilities - advanced solar science, Proceedings of a Workshop held at Göttingen September 27-29, 2006 ISBN 978-3-938616-84-0 382 pages, many illustrations, soft-bound, Price: 23.- Euros Published by Universitätsverlag Göttingen (http://univerlag.uni-goettingen.de The online edition (PDF, 12 MB) is available free of charge at: http://webdoc.sub.gwdg.de/univerlag/2007/solar_science_book.pdf, p.245"
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2007
Citations
0
Refereed citations
0
Description
Velocity oscillations measured simultaneously at the photosphere and the
chromosphere of different solar magnetic features (sunspots, pores and
facular regions) allow us to study the properties of wave propagation as
a function of the magnetic flux of the structure. While photospheric
oscillations are similar everywhere, oscillations measured at
chromospheric heights show different amplitudes, frequencies and stages
of shock development depending on the observed magnetic feature. The
analysis via power and phase spectra, together with simple theoretical
modeling, lead to a series of results concerning wave propagation within
the range of heights of this study. We find that, while the atmospheric
cut-off frequency and the propagation properties of the different
oscillating modes depend on the magnetic feature, in all the cases the
power that reaches the high chromosphere comes directly from the
photosphere by means of linear wave propagation rather than from
non-linear interaction of modes.