(workshop hold July 5-9, 2004 in Hamburg, Germany)
Sven Wedemeyer-Böhm
(Kiepenheuer-Institut f. Sonnenphysik, D-79104 Freiburg, Germany),
The shock-patterned solar chromosphere in the light of ALMA
Recent three-dimensional radiation hydrodynamic simulations by
Wedemeyer et al. (2004) suggest that the solar chromosphere is highly structured in space and
time on scales of only 1000 km and 20-25 sec, resp.. The resulting pattern
consists of a network of hot gas and enclosed cool regions which are due to the
propagation and interaction of shock fronts. In contrast to many other
diagnostics, the radio continuum at millimeter wavelengths is formed in LTE, and
provides a rather direct measure of the thermal structure. It thus facilitates
the comparison between numerical model and observation. While the involved time
and length scales are not accessible with todays equipment for that wavelength
range, the next generation of instruments, such as the Atacama Large Millimeter
Array (ALMA), will provide a big step towards
the required resolution. Here we present results of
radiative transfer calculations at mm and sub-mm wavelengths
with emphasis on spatial and temporal resolution which are crucial
for the ongoing discussion about the chromospheric temperature structure.
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Hans-Günter Ludwig
(Lund Observatory, Lund, Sweden),
Matthias Steffen
(Astrophysikalisches Institut Potsdam, D-14482 Potsdam, Germany),
Bernd Freytag
(Astronomical Observatory, University of Uppsala, Sweden),
Hartmut Holweger
(Institut für Theoretische Physik und Astrophysik, Universität Kiel, D-24098 Kiel, Germany),
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