Abstract
An analysis of line-of-sight velocity oscillation in nine solar faculae was undertaken with the aim of studying phase relations between chromospheric (He i 10830 Å line) and photospheric (Si i 10827 Å line) five-minute oscillations. We found that the 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 Å and Si i 10827 Å 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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Kobanov, N.I., Kustov, A.S., Chupin, S.A. et al. Oscillations in Solar Faculae. III. The Phase Relations Between Chromospheric and Photospheric Line-of-Sight Velocities. Sol Phys 273, 39–49 (2011). https://doi.org/10.1007/s11207-011-9847-x
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DOI: https://doi.org/10.1007/s11207-011-9847-x