Wave observations in the solar transition region with the solar maximum mission

Astronomy and Astrophysics – Astronomy

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Solar Flux, Solar Maximum Mission, Ultraviolet Astronomy, Acoustic Propagation, Atmospheric Heating, Chromosphere, Energy Transfer, Line Spectra, Propagation Velocity, Solar Corona, Vertical Motion

Scientific paper

Observations of intensity and velocity oscillations in the solar transition region obtained with the UVSP instrument on the Solar Maximum Mission in the N V line at 1238 A have been analyzed in order to ascertain their nature. It has been reported that in about 2/3 of the experiments, the data were consistent with the behavior expected from acoustic waves. It has been found that an estimate of the energy flux carried by the waves still yields a value too low to provide for coronal heating. There is evidence for the existence of an upward directed flux, and there are indications that through observations with improved spatial and temporal resolution a higher energy flux level might be revealed. Methods used to confirm the nature of the waves are presented, and the observations are described.

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