Oscillations in a sunspot umbra from the inversion of infrared Stokes profiles

Bibcode
1999AGM....15..A07B
Bellot Rubio, Luis R.; Collados, Manuel; Ruiz Cobo, Basilio; Rodríguez Hidalgo, Inés; Bogdan, Thomas J.
Bibliographical reference

AG Abstract Services, vol. 15. Abstracts of Contributed Talks and Posters presented at the Annual Scientific Meeting of the Astronomische Gesellschaft, in Goettingen, 20-25 September 1999.

Advertised on:
0
1999
Number of authors
5
IAC number of authors
4
Citations
0
Refereed citations
0
Description
We report on the detection of magnetic field strength and velocity oscillations in the photosphere of a sunspot umbra. Our analysis is based on the inversion of the full Stokes profiles of three Fe I lines at 15650 Å, from which the stratification with optical depth of the different atmospheric parameters has been derived. This allows us to estimate the amplitude of the oscillations and the phase lag between the fluctuations in the line-of-sight velocity and field strength. Our results suggest that the inferred magnetic field oscillations are caused by opacity fluctuations that move upward and donward the region where the spectral lines are sensitive to magnetic fields.
Type
Non-refereed

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