Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9407s&link_type=abstract
American Astronomical Society Meeting 210, #94.07; Bulletin of the American Astronomical Society, Vol. 39, p.218
Astronomy and Astrophysics
Astronomy
Scientific paper
The Solar Optical Telescope (SOT) on the Hinode satellite (launched October 2006) has obtained long and nearly continuous time series of several large sunspots including those in NOAA AR's 10923, 10925, and 10930. Here we use high resolution movies taken primarily with the broad band Ca II (396.8nm) and G band (430.5nm) channels and magnetograms taken with the 630.2nm narrow band channel to study the details and short term evolution of penumbral fine structures as well as the long term evolution of the sunspots. We compute flow maps and use space/time slices to track motions of Evershed clouds, penumbral grains, and visualize oscillations. The data contain examples of penumbral formation and disintegration including "orphan" penumbra (i.e., penumbra without an obvious umbra). There is also an interesting instance of "colliding" penumbra in AR 10930 as two sunspots of opposite polarity converged. The zone of apparent shear was associated with several flares.
This work was supported by NASA contract NNM07AA01C
Hagenaar M.
Ichimoto Kiyoshi
Katsakawa Y.
Kubo Masahito
Lites Bruce
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