✦ LIBER ✦

Observations of coronal oscillations above an active region

✍ Scribed by Thomas F. Egan; Timothy J. Schneeberger

Publisher: Springer
Year: 1979
Tongue: English
Weight: 737 KB
Volume: 64
Category: Article
ISSN: 0038-0938
DOI: 10.1007/bf00151433

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✦ Synopsis

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/~. 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 rain, 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.

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