Abstract
We find that oscillations of the LOS velocity in Hα vary within facula regions. The power spectra show that the contributions of low-frequency modes (1.2 – 2 mHz) increase at the network boundaries. Three- and five-minute periods dominate inside cells. The spectra of photospheric and chromospheric LOS-velocity oscillations differ for most faculae. We detected several cases where oscillations in faculae seem to propagate horizontally with phase velocities of 50 – 70 km s−1. Their location in space and time coincided with the local maximum of the longitudinal magnetic field.
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Helioseismology
Guest Editors: G. Houdek, H. Shibahashi, and J. Zhao.
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Kobanov, N.I., Pulyaev, V.A. Spatial Distribution of Oscillations in Faculae. Sol Phys 268, 329–334 (2011). https://doi.org/10.1007/s11207-010-9581-9
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DOI: https://doi.org/10.1007/s11207-010-9581-9