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

Details High Spatial Resolution Observations of a Sunspot with an ``Orphan Penumbra'' High Spatial Resolution Observations of a Sunspot with an ``Orphan Penumbra''

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spd....28.0245d&link_type=abstract

American Astronomical Society, SPD meeting #28, #02.45; Bulletin of the American Astronomical Society, Vol. 29, p.901

Astronomy and Astrophysics

Astronomy

Scientific paper

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 Hα , 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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