The oscillatory velocity field observed in a unipolar sunspot region |
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| Authors: | J B Rice V Gaizauskas |
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| Institution: | (1) Dept. of Physics, University of Alberta, Edmonton, Alberta, Canada;(2) Present address: Brandon University, Brandon, Manitoba, U.S.A.;(3) Astrophysics Branch, National Research Council of Canada, Ottawa, Canada |
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| Abstract: | The velocity field has been mapped for 42 min in an area 80 by 85 containing a unipolar sunspot. Apparent shifts of Fe i
 5233 were measured photoelectrically using a rectangular scanning aperture 1.6 × 4.0. The sunspot did not exert a marked influence on the generally random pattern of oscillations at a period of 300 s. Discrete periods of oscillation both longer and shorter than 300 s were excited within the enhanced magnetic field boundaries of this spot. Umbral oscillations at periods near 180 s were detected in agreement with independent observations of the same spot during the previous solar rotation.NRC Postdoctoral Fellow, 1969–71. |
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