Evidence for Fine Structure in the Chromospheric Umbral Oscillation

Details Evidence for Fine Structure in the Chromospheric Umbral Oscillation Evidence for Fine Structure in the Chromospheric Umbral Oscillation

2005-10-26

arxiv.org/abs/astro-ph/0510740v1

Astrophys.J.635:670-673,2005

Astronomy and Astrophysics

Astrophysics

To appear in the Astrophysical Journal

Scientific paper

10.1086/497393

Novel spectro-polarimetric observations of the \ion{He}{1} multiplet are used to explore the dynamics of the chromospheric oscillation above sunspot umbrae. The results presented here provide strong evidence in support of the two-component model proposed by Socas-Navarro and co-authors. According to this model, the waves propagate only inside channels of sub-arcsecond width (the ``active'' component), whereas the rest of the umbra remains nearly at rest (the ``quiet'' component). Although the observations support the fundamental elements of that model, there is one particular aspect that is not compatible with our data. We find that, contrary to the scenario as originally proposed, the active component remains through the entire oscillation cycle and harbors both the upflowing and the downflowing phase of the oscillation.

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