Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...424.1049s&link_type=abstract
Astronomy and Astrophysics, v.424, p.1049-1053 (2004)
Astronomy and Astrophysics
Astrophysics
46
Sun: Sunspots, Sun: Magnetic Fields, Sun: Photosphere, Magnetohydrodynamics
Scientific paper
Recent sunspot observations at unprecedented resolution have led to the discovery of dark cores in the bright filaments that form the penumbra (\citealt{scharmer02_Nat420}). The discovery paper considered spots at disk center only, so the properties of the dark-cored filaments remain largely unknown. Here we analyze a speckle-reconstructed time series of G-band and blue continuum images of a sunspot acquired with the Dutch Open Telescope. The target was located at an heliocentric angle of 27 deg. We confirm the existence of dark-cored penumbral filaments also in spots outside the disk center, and report on distinct differences between the center and limb-side penumbra. In the inner center-side penumbra, filaments are detected as two narrow bright streaks separated by a central obscuration. These structures move together as a single entity. On the limb side, dark cores are hardly seen. The time series is used to determine the sizes (˜200-250 km), proper motions (˜280 m s-1), and lifetimes (⪉45 min) of typical dark-cored filaments.
Bellot Rubio Luis Ramon
Schlichenmaier Rolf
Sutterlin Peter
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