Wave propagation and shock formation in diverse magnetic structures

Centeno, R.; Collados, M.; Trujilo-Bueno, J.
Referencia bibliográfica

"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"

Fecha de publicación:
0
2007
Número de autores
3
Número de autores del IAC
0
Número de citas
0
Número de citas referidas
0
Descripción
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.