Steady flows in active regions observed with the HeI 10830 Å line |
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| Authors: | Bruce W Lites Stephen L Keil Göran B Scharmer Arne A Wyller |
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| Institution: | (1) National Solar Observatory, National Optical Astronomy Observatories, Sunspot, New Mexico, USA;(2) High Altitude Observatory, National Center for Atmospheric Research, USA;(3) Air Force Geophysics Laboratory, National Solar Observatory, National Optical Astronomy Observatories, Sunspot, New Mexico, USA;(4) Stockholm Observatory, Stockholm, Sweden;(5) High Altitude Observatory, National Center for Atmospheric Research, USA;(6) Royal Swedish Academy of Sciences, Sweden |
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| Abstract: | We show that the He i 10830 A line gives reliable Doppler shift measurements in the upper chromosphere above active regions. Persistent flow patterns in active regions observed near the solar limb show features previously noted in Dopplergrams using the Civ transition region ultraviolet emission line. Unlike the Civ measurements, however, the He i absorption shows a strong correlation with the line-of-sight velocity images in certain regions of some active regions.Operated by the Association of Universities for Research in Astronomy, Inc., under contract AST 78-17292 with the United States National Science Foundation.The National Center for Atmospheric Research is operated by the University Corporation for Atmospheric Research under sponsorship of the National Science Foundation.Visiting Astronomers, Sacramento Peak Observatory. |
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