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High Angular Resolution Stokes V Spectra in Penumbrae

Published online by Cambridge University Press:  12 April 2016

J. Sánchez Almeida ,
V. Martínez Pillet ,
J. Trujillo Bueno  and
B.W. Lites
J. Sánchez Almeida
Affiliation:
Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
V. Martínez Pillet
Affiliation:
Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
J. Trujillo Bueno
Affiliation:
Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
B.W. Lites
Affiliation:
High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado 80307–3000, USA

Abstract

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Stokes I and V profiles of Fel 630.1 nm and Fel 630.2 nm observed in a sunspot with an angular resolution ≥0.5” are analyzed. We find asymmetric V-profiles whose shapes are in agreement with previous determinations having lower angular resolution (~5”). We also find a correlation between penumbral small scale variations of continuum intensity and velocity. Although it involves smaller velocities, such correlation resembles that existing in the quiet sun as a consequence of convection.

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. 192 - 195
Copyright
Copyright © Astronomical Society of the Pacific 1993

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