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Early Results from the HAO/NSO Advanced Stokes Polarimeter

Published online by Cambridge University Press:  12 April 2016

B. W. Lites ,
D. F. Elmore ,
S. Tomczyk ,
P. Seagraves ,
A. Skumanich  and
K. V. Streander
B. W. Lites
Affiliation:
High Altitude Observatory, National Center for Atmospheric Research, 1P.O. Box 3000, Boulder, CO 80307, USA
D. F. Elmore
Affiliation:
High Altitude Observatory, National Center for Atmospheric Research, 1P.O. Box 3000, Boulder, CO 80307, USA
S. Tomczyk
Affiliation:
High Altitude Observatory, National Center for Atmospheric Research, 1P.O. Box 3000, Boulder, CO 80307, USA
P. Seagraves
Affiliation:
High Altitude Observatory, National Center for Atmospheric Research, 1P.O. Box 3000, Boulder, CO 80307, USA
A. Skumanich
Affiliation:
High Altitude Observatory, National Center for Atmospheric Research, 1P.O. Box 3000, Boulder, CO 80307, USA
K. V. Streander
Affiliation:
High Altitude Observatory, National Center for Atmospheric Research, 1P.O. Box 3000, Boulder, CO 80307, USA

Abstract

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The Advanced Stokes Polarimeter is a new instrument dedicated to quantitative measurement of vector magnetic fields in lines formed at several heights in the solar atmosphere at high angular resolution. We present results for a small, symmetric sunspot observed under good seeing conditions near disk center on 25 March 1992. The narrow penumbral “spines” of more vertical field reported by Degenhardt and Wiehr (1991) and Title et al. (1992) are clearly seen in these observations. These spines are characterized by higher field strength than the surrounding penumbra. The inferred field azimuth indicates that these spines flare out with height, as would be expected of stronger field intrusions within the background penumbral field. The observations indicate the penumbral field “canopy” extends well beyond the outer edge of the penumbra. Outside of the sunspot, the small flux elements of mixed polarity are nearly vertical in orientation.

Type
Session 3. Techniques of Magnetic Field Measurements
Information
International Astronomical Union Colloquium , Volume 141: The Magnetic and Velocity Fields of Solar Active Regions , 1993 , pp. 173 - 176
Copyright
Copyright © Astronomical Society of the Pacific 1993

References

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