Observations of coronal oscillations above an active region |
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| Authors: | Thomas F Egan Timothy J Schneeberger |
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| Institution: | (1) Department of Physics, The University of Texas at El Paso, El Paso, Tex., U.S.A.;(2) Air Force Geophysics Laboratory, Sacramento Peak Observatory, Sunspot, NM, U.S.A. |
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| Abstract: | Periodic Doppler width fluctuations have been observed in Fe xiv spectra above an active region. The oscillations have a period of 6.1 ± 0.6 min and a peak-to-peak amplitude of 0.07 ± 0.006 Å. The amplitude of the oscillation increases with height above the limb, and is enhanced at specific heights where we marginally detect line center intensity oscillations. The intensity fluctuations have a period of 6.1 min, an amplitude of 2.0 ± 1.4%, and are 180 ° out of phase with the width oscillations. A comparison region in the quiet corona showed no evidence of oscillatory phenomena.Visiting Student, Sacramento Peak Observatory.NAS/NRC Resident Research Associate.Operated by the Association of Universities for Research in Astronomy Inc., under contract with the National Science Foundation. |
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