EDP Sciences
Free access
Volume 403, Number 1, May III 2003
Page(s) 297 - 302
Section Diffuse matter in space
DOI http://dx.doi.org/10.1051/0004-6361:20030366

A&A 403, 297-302 (2003)
DOI: 10.1051/0004-6361:20030366

Full-disk magnetic oscillations in the solar photosphere

P. F. Moretti1, A. Cacciani2, A. Hanslmeier3, M. Messerotti4, W. Otruba5 and A. Warmuth3

1  INAF, Osservatorio Astronomico di Capodimonte, via Moiarello 16, 80131 Napoli, Italy
2  Department of Physics University of Rome, P.le A. Moro 2, 00185 Rome, Italy
3  Institute of Geophysics, Astrophysics and Meteorology of the University of Graz, Universitaetsplatz 5, 8010 Graz, Austria
4  INAF, Osservatorio Astronomico di Trieste, via G. B. Tiepolo 11, 34131 Trieste, Italy
5  Kanzelh $\ddot{\rm o}$he Solar Observatory, 9521 Treffen, Austria

(Received 4 October 2002 / Accepted 27 February 2003 )

Photospheric observations of the magnetic oscillations have been carried out to research magneto-acoustic waves in spots. The coupling between the magnetic field and the p-modes has been studied using reduced areas on the solar disk, but a global scenario is still missing. Four hour full-disk ma gne to grams (at 4 arcsec/pix spatial resolution) obtained in the sodium D-lines were analysed pixel-by-pixel (locally) and using the spherical harmonics decomposition (globally). Magnetic oscillations were detected at dif fe rent frequencies and identified on the solar disk. The global properties of the magnetic oscillations, shown via the $\ell -\nu$ diagrams, are for the first time presented and discussed.

Key words: Sun: oscillations -- Sun: magnetic fields

Offprint request: P. F. Moretti, moretti@na.astro.it

© ESO 2003