Observations of the horizontal velocity
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N. R. Sheeley
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Article
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1972
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Springer
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English
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During the summer and fall of 1971, Doppler spectroheliograms were obtained for several sunspots located near the solar limb. These observations confirm a previous result based on the study of only a few sunspots that in the plage-free photosphere surrounding sunspots the spatiallyaveraged, horizont