Local Helioseismology with GFPI at the Vacuum Tower Telescope, Tenerife

Details Local Helioseismology with GFPI at the Vacuum Tower Telescope, Tenerife Local Helioseismology with GFPI at the Vacuum Tower Telescope, Tenerife

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12..2.3s&link_type=abstract

"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,

Physics

Scientific paper

Local Helioseimology has recently become an important tool to investigate the Solar Interior in the vicinity of localized phenomena like sunspots. It possibly holds the promise to give informations about subsurface magnetic fields and material flows. We are currently modifying the GFPI Instrument at the VTT which will also be a First Light Instrument at GREGOR Telescope to the needs of ground-based helioseismologic observations (GFPI: Göttingen Fabry Perot Interferomer).
The upgrade consists of a CCD-camera with a larger Field-of-View (100"-by-100"), a modified Interfacing Hardware and dedicated Control- and Recording-Software. Direct Interfacing to the VTT's telescope control system allows for mosaic type patching of the observations field. Cadence times of below 1 Minute for a 300"-by-300" field at the telescope's resolution limit of 0.2" are possible. Data are stored to USB-based external harddisks. An of-the-shelf beamer allows for optical adjustments with an artificial light source.
Available Preprocessing Tools allow to immediately visualize the quality of the observational data. This includes a prelimary Ringdiagram Analysis. Future Online Preprocessing Capabilities are to further reduce the achievable cycle times.
We will present some details of the instrumental setup and some prelimiary observational results.

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