Astronomy and Astrophysics – Astronomy
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...552..871l&link_type=abstract
The Astrophysical Journal, Volume 552, Issue 2, pp. 871-876.
Astronomy and Astrophysics
Astronomy
15
Sun: Chromosphere, Sun: Infrared, Sun: Magnetic Fields, Sun: Oscillations
Scientific paper
We report on Télescope Héliographique pour l'Etude du Magnétisme et des Instabilités Solaires (THEMIS)2 observations of linear polarization events associated with umbral flashes observed in the Ca II infrared (IR) triplet lines. The observed signals are usually delayed in time and shifted in space when compared to the intensity and circular polarization signals from the flash. The observations are compatible with a scenario whereby flashes are produced by a perturbation propagating along the magnetic field lines as they bend out toward the penumbra. Only a fraction of the resolution element appears to be emitting flashlike profiles, as if the waves were propagating only within localized magnetic field lines. This localization, however, does not impede the apparent propagation of the perturbation horizontally within the umbra.
López Ariste Arturo
Molodij Guillaume
Socas-Navarro Hector
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