Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-09-28
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
proceedings of GONG 2010/SOHO 24 meeting, June 27 - July 2, 2010, Aix-en-Provence, France
Scientific paper
We study the propagation of waves from the photosphere to the chromosphere of sunspots. From time series of cospatial Ca II H (including its line blends) intensity spectra and polarimetric spectra of Si I 1082.7 nm and He I 1083.0 nm we retrieve the line-of-sight velocity at several heights. The analysis of the phase difference and amplification spectra shows standing waves for frequencies below 4 mHz and propagating waves for higher frequencies, and allows us to infer the temperature and height where the lines are formed. Using these observational data, we have constructed a model of sunspot, and we have introduced the velocity measured with the photospheric Si I 1082.7 nm line as a driver. The numerically propagated wave pattern fits reasonably well with the observed using the lines formed at higher layers, and the simulations reproduce many of the observed features. The observed waves are slow MHD waves propagating longitudinally along field lines.
Beck Ch.
Collados Manuel
Felipe T.
Khomenko Elena
No associations
LandOfFree
Magneto-acoustic waves in sunspots from observations and numerical simulations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Magneto-acoustic waves in sunspots from observations and numerical simulations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magneto-acoustic waves in sunspots from observations and numerical simulations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-693587