NSO Workshop #23, Solar MHD: Theory and Observations - a High Spatial Resolution Perspective, Sac Peak, USA, 2005

ASP Conf. Series 354, 284

Friedrich Wöger, Sven Wedemeyer-Böhm, Wolfgang Schmidt, Oskar von der Lühe
(Kiepenheuer-Institut für Sonnenphysik, Schöneckstrasse 6, 79104 Freiburg, Germany)

High resolution time series of narrowband Ca II K images in the chromosphere

We have observed a region of quiet Sun near disk center with the Vacuum Tower Telescope (VTT) of the Kiepenheuer-Institut für Sonnenphysik at the Observatorio del Teide, Tenerife, Spain in April 2005 in several wavelengths. Observations were made at the Ca II K line at 393.3 nm, using a Lyot filter with a bandwidth of 30 pm FWHM, centered at the K2v emission peak; at the H-alpha line at 656.3 nm, using a Lyot filter (25 pm FWHM) centered at line core, and in the G-band (430.5 nm), using an interference filter (1 nm FWHM). We acquired a 2-hour sequence of images at a cadence of 10 s and a spatial resolution of about 0.3 arcsecs. We present our Ca observations of excellent spatial resolution which show morphological structures in internetwork regions similar in form, size and lifetime to those present in recent numerical models of the solar chromosphere.

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