Oscillations in the Solar Faculae. III. The Phase Relations between Chromospheric and Photospheric LOS Velocities

Details Oscillations in the Solar Faculae. III. The Phase Relations between Chromospheric and Photospheric LOS Velocities Oscillations in the Solar Faculae. III. The Phase Relations between Chromospheric and Photospheric LOS Velocities

2011-10-07

arxiv.org/abs/1110.1438v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

12 pages, 6 figures, accepted in Solar Physics

Scientific paper

An analysis of line-of-sight velocity oscillation in nine solar faculae was undertaken with the aim of studying of phase relations between chromosphere (He i 10830 A line) and photosphere (Si i 10827 A line) five-minute oscillations. We found that time lag of the chromospheric signal relative to photospheric one varies from -12 to 100 seconds and is about 50 seconds on average.We assume that the small observed lag can have three possible explanations: i) convergence of formation levels of He i 10830 A and Si i 10827 A in faculae; ii) significant increase of five-minute oscillation propagation velocity above faculae; iii) simultaneous presence of standing and travelling waves.

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