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White light sunspot observations from the Solar Optical Universal Polarimeter on Spacelab-2The flight of the Solar Optical Universal Polarimeter on Spacelab-2 provided the opportunity for the collection of time sequences of diffraction-limited (0.5 arcsec) solar images with excellent pointing stability (0.003 arcsec) and with freedom from the distortion that plagues ground-based images. A series of white-light images of active region 4682 were obtained on August 5, 1985, and the area containing the sunspot has been analyzed. These data have been digitally processed to remove noise and to separate waves from low-velocity material motions. The results include: (1) proper motion measurements of a radial outflow in the photospheric granulation pattern just outside the penumbra; (2) discovery of occasional bright structures ('streakers') that appear to be ejected outward from the penumbra; (3) broad dark 'clouds' moving outward in the penumbra, in addition to the well-known bright penumbral grains moving inward; (4) apparent extensions and contractions of penumbral filaments over the photosphere; and (5) observation of a faint bubble or looplike structure that seems to expand from two bright penumbral filaments into the photosphere.
Document ID
19880033436
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Shine, R. A.
(Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Title, A. M.
(Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Tarbell, T. D.
(Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Topka, K. P.
(Lockheed Research Laboratories Palo Alto, CA, United States)
Date Acquired
August 13, 2013
Publication Date
November 27, 1987
Publication Information
Publication: Science
Volume: 238
ISSN: 0036-8075
Subject Category
Solar Physics
Accession Number
88A20663
Funding Number(s)
CONTRACT_GRANT: NAS8-32805
CONTRACT_GRANT: NAS5-26813
Distribution Limits
Public
Copyright
Other

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