The Visible Tunable Filter and the Science it will do

Details The Visible Tunable Filter and the Science it will do The Visible Tunable Filter and the Science it will do

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.0806s&link_type=abstract

American Astronomical Society, SPD meeting #42, #8.06; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

With the Visible Tunable Filter (VTF) of the ATST we will measure the solar magnetic field and its interaction with the constantly moving plasma in the atmosphere with hitherto unseen precision and resolution. Observations with the two-dimensional spectro-polarimeter VTF will unveil those physical processes that are relevant to understand solar magnetic activity on length scales between 20 km and 40,000 km.
The VTF is a narrowband tunable filter system for imaging spectroscopy based on Fabry Perot interferometers. It will operate in the visible spectral range with access to a host of magnetically sensitive lines at highest spatial resolution. Its multi-line capability, together with fast detectors, a field of view of one arc minute, and the ability to measure polarization states of the incoming light allow to probe the solar atmosphere from the photosphere to the chromosphere within a couple of seconds. The instrument is capable to vary the spectral sampling, the signal-to noise ratio, and the temporal cadence over a wide range without changing or compromising the opto-mechanical setup. This versatility gives unique possibilities to deal with a variety of science questions and to apply different measurement schemes. Here are two examples:
We will observe short-lived processes on sub-granular scales down to 20 km to understand how small-scale vortex flows transport and redistribute mechanical energy at the solar surface. Simultaneous magnetic field measurements at the same resolution will show how the interaction of magnetized and non-magnetized material.
The length scales of thermal and magnetic structures in sunspots span three orders of magnitude, from the spot diameter down to the resolution limit of the ATST. With the VTF we will measure the processes that accompany the formation, development and decay of sunspots in order to understand the governing physical mechanisms.

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