Observations of coronal oscillations above an active region

Details Observations of coronal oscillations above an active region Observations of coronal oscillations above an active region

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979soph...64..223e&link_type=abstract

Solar Physics, vol. 64, Dec. 1979, p. 223-228.

Physics

9

Doppler Effect, Solar Corona, Spectral Line Width, Spectroheliographs, Atmospheric Heating, Data Reduction, Power Spectra, Solar Atmosphere

Scientific paper

Periodic Doppler width fluctuations have been observed in Fe XIV spectra above an active region. The oscillations have a period of 6.1 + or - 0.6 min and a peak-to-peak amplitude of 0.07 + or - 0.006 A. The amplitude of the oscillation increases with height above the limb, and is enhanced at specific heights where line center intensity oscillations are marginally detected. The intensity fluctuations have a period of 6.1 min, and amplitude of 2.0 + or - 1.4%, and are 180 deg out of phase with the width oscillations. A comparison region in the quiet corona showed no evidence of oscillatory phenomena.

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