Space-time profile variations of some spectral lines and their influence upon doppler velocity measurements |
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| Authors: | N I Kobanov |
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| Institution: | (1) Institute of Solar-Terrestrial Physics, Irkutsk 33, 664033, Russian Federation |
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| Abstract: | 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 Fei 5123, 5250, 5434  and NaDi 5896 line profiles are able to produce signals equivalent to line-of-sight velocities of 1–5 m s–1 at a spatial resolution of 5 and 10–35 m s–1 at 1.5 × 4 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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