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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.


The author(s) of this abstract have provided an email address for comments about the abstract: cdenker@bigbear.caltech.edu

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