Periodic oscillations found in coronal velocity fields

Details Periodic oscillations found in coronal velocity fields Periodic oscillations found in coronal velocity fields

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977soph...51..121t&link_type=abstract

Solar Physics, vol. 51, Jan.-Feb. 1977, p. 121-130.

Physics

22

Line Spectra, Solar Corona, Solar Spectra, Coronagraphs, Doppler Effect, Plasma Oscillations, Power Spectra, Solar Wind Velocity, Velocity Distribution

Scientific paper

By making line profile analyses of the Fe XIV lambda 5303 coronal line, temporal variations of three fundamental quantities, the line intensity, the FWHM, and the Doppler velocity, have been investigated for an active region. The power spectrum shows that the line-of-sight Doppler velocity fluctuated periodically at two locations with a period of nearly 300 seconds, while no periodic oscillations were found in line intensity. As to the FWHM, some evidence of periodic fluctuations are recognized but in a less distinct manner.

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