(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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