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Paper: Observations of Coronal Oscillations and Waves
Volume: 205, The Last Total Solar Eclipse of the Millennium in Turkey
Page: 11
Authors: Ichimoto, K.; Singh, J.
Abstract: Spectroscopic observations of coronal active regions were performed with coronagraphs at the Norikura Solar Observatory, and time variations of intensity and Doppler shift of coronal emission lines were investigated to study coronal oscillations and waves. It is found in most observational data that the Doppler signal shows definite time variabilities compared with the intensity. Periodic variations were found in Doppler signal with periods ranging from a few minutes to 40 minutes and amplitudes of 1km/s or less. Recent filter-based observations give a hint of transient disturbances of Doppler signal propagating upward in the corona.
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