White light sunspot observations from the Solar Optical Universal Polarimeter on Spacelab-2

Details White light sunspot observations from the Solar Optical Universal Polarimeter on Spacelab-2 White light sunspot observations from the Solar Optical Universal Polarimeter on Spacelab-2

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987sci...238.1264s&link_type=abstract

Science (ISSN 0036-8075), vol. 238, Nov. 27, 1987, p. 1264-1267. Research supported by the Lockheed Independent Research Fund.

Physics

8

Image Analysis, Polarimeters, Solar Instruments, Spacelab Payloads, Sunspots, Image Resolution, Photosphere, Satellite-Borne Instruments, Temporal Distribution

Scientific paper

The 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.

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