Short-period oscillations found in a quiescent prominence
Abstract
For the purpose of detecting periodic oscillations or waves in a quiescent prominence, time-series observations of Ca II K line spectra were carried out at the Hida Observatory. Detailed line-profile analyses followed by power spectral analyses have led to the conclusion that nearly the same phase of periodic oscillations, having a period of 160 s and an amplitude of 0.8-1.4 km/s, were found in the line-of-sight Doppler velocity at successive locations over 15,000 km along the spectrograph slit. The intensity showed a slight indication for periodic fluctuations with a period of 240 s. In the line width, however, no periodicity was detected from the direct inspection of temporal variations from the power spectral analysis.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- 1987
- Bibcode:
- 1987PASJ...39..179T
- Keywords:
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- K Lines;
- Power Spectra;
- Solar Oscillations;
- Solar Prominences;
- Spectrum Analysis;
- Time Series Analysis;
- Doppler Effect;
- Fourier Analysis;
- Normal Density Functions;
- Radial Velocity;
- Velocity Distribution;
- Solar Physics