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Session 2 - Everything Else.
Display session, Friday, June 27
Ballroom C, Chair: Richard Canfield

[2.45] High Spatial Resolution Observations of a Sunspot with an ``Orphan Penumbra''

C. Denker, H. Zirin (BBSO, Caltech), H. Wang (NJIT)

We present a detailed analysis of a high spatial resolution, six hour time-series of a stable sunspot (NOAA 5612) obtained at the Big Bear Solar Observatory (BBSO) with the 65 cm vacuum reflector on August 2nd, 1989 (cf.\ H. Zirin and H. Wang: 1991, Adv.\ Space.\ Res., Vol. 11, pp. 225-231). The sunspot shows an ``orphan penumbra'' which exhibits motions similar to normal penumbrae. The time-series consists of filtergrams taken at H\alpha, CaK, and the continuum. In addition, magnetograms and dopplergrams were recorded with the BBSO Video Magnetograph System. Our investigation aims at a better understanding of moving magnetic features, penumbral fine-structures, and characteristics of the Evershed flow. Therefore, we derived and compared the proper motions visible in the different filtergrams, dopplergrams, and magnetograms.

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