Physics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..145...11k&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 145, no. 1, p. 11-18.
Physics
7
Doppler Effect, Helioseismology, Line Spectra, Solar Spectra, Velocity Measurement, Visible Spectrum, D Lines, Iron, Sodium, Solar Oscillations
Scientific paper
A technique for high-sensitivity measurements of spectral line profile fluctuations is suggested. Observations with spectral lines most commonly used to study the oscillations have been carried out. It is found that 5-min and 3-min fluctuations of Fe I 5123, 5250, 5434 A and NaD I 5896 A line profiles are able to produce signals equivalent to line-of-sight velocities of 1-5 m/s at a spatial resolution of 5 arcmin and 10-35 m/s at 1.5 x 4 arcsec resolution. Such observations permit a better understanding of the particular physical factors responsible for the oscillations of line-of-sight velocity signals and the magnetic field which are the subject of study of helioseismology.
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