The interpretation of velocity filtergrams |
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| Authors: | J M Beckers R L Parnell |
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| Institution: | (1) Air Force Institute of Technology, Dayton, Ohio, U.S.A.;(2) Sacramento Peak Observatory, Air Force Cambridge Research Laboratories, Sunspot, N.M., U.S.A. |
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| Abstract: | The paper describes a numerical experiment in which the effect of an assumed velocity distribution in the solar atmosphere on the intensity difference between a blue- and a red-wing filter-gram is derived. This results in the effective optical depth at which the velocity is measured. It is shown that this  eff strongly depends on the assumed velocity distribution. |
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