Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp31a..04m&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SP31A-04
Physics
7509 Corona, 7549 Ultraviolet Emissions
Scientific paper
Damped Doppler shift oscillations have been observed in emission lines from ions formed at flare temperatures with the Solar Ultraviolet Measurements of Emitted Radiation spectrometer on SOHO and the Bragg Crystal Spectrometer on Yohkoh. We report the detection of similar oscillations in coronal emission lines observed with the EUV Imaging Spectrometer on the Hinode satellite. The oscillations, which are present in emission lines formed at lower temperatures than seen with the instruments listed above, have an amplitude of about 2 km s- 1, and a period of around 35 min. The decay times show some evidence for a temperature dependence with the lowest temperature of formation emission line (Fe~XII 195.12 Å) exhibiting a decay time of about 43 min, while the highest temperature of formation emission line (Fe~XV 284.16 Å) shows no evidence for decay over more than two periods of the oscillation. The data appear to be consistent with slow magnetoacoustic standing waves.
Mariska John T.
Warren Harry P.
Watanabe Ta.
Williams David Richard
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