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R. I. Bush (Stanford University), R. A. Shine (Lockheed Martin), P. Brandt (Kiepenheuer-Institut, Freiburg), M. Sobotka (Astronomical Institute, Czech Academy of Sciences), G. Scharmer (Stockholm Observatory)
During the first two weeks of June 1999, coordinated observations of sunspots were made by the MDI instrument on the SOHO spacecraft, the TRACE satellite and the Swedish Vacuum Solar Tower (SVST) at La Palma. The MDI instrument was operating in a "high resolution" mode and was obtaining 1.2 arc-second resolution magnetograms and 2.4 arc-second resolution dopplergrams at a one minute cadence. TRACE observations were made in Fe IX/X 171Å\ and/or Fe XII 195Å\ together with the 1600Å\ and continuum bands at a 1.0 arc-second resolution. The SVST data consist of filtergrams taken with three 2K\times2K CCD cameras with about 0.4 arc-second resolution operating in frame selection mode. The first camera used a fixed G band (4305Å) filter, the second a fixed blue continuum filter (4507Å), and the third a narrow band tunable filter which was cycled through several positions in the H{\alpha} line and the 6302Å\ Fe~I line.
The goal of this investigation is to detail the evolution of stable sunspots in order to understand the detailed correlation of photospheric flows and magnetic features. The high time and spatial resolution of these measurements provides a unique opportunity to explore the interactions of plasma and magnetic field at the solar surface.
This work was supported by NASA grant NAG5-3077 at Stanford and NASA contract NAS5-38099 at Lockheed Martin.