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Influence of the Magnetic Field on Oscillation Spectra in Solar Faculae

  • Waves in the Solar Corona
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Abstract

We study oscillation parameters in faculae above magnetic knots and in the areas adjacent to them. Using Solar Dynamics Observatory (SDO) data, we analyse oscillations in magnetic field strength, Doppler velocity, and intensity signals for the lower photosphere, and in intensity for the higher levels. We find peaks in the oscillation spectra for the magnetic field strength in magnetic knots at a frequency of about 4.8 mHz, while there are no such frequencies in the adjacent facular patches, which have a moderate field strength. In contrast, the spectra for the Doppler velocity oscillations are similar for these types of regions: in both cases, the significant peaks are in the 2.5 – 4.5 mHz range, although the oscillations in magnetic knots are 2 – 3 times weaker than those at the facular periphery. In the upper photosphere, the dominant frequencies in magnetic knots are 0.5 – 1 mHz higher than in the medium-field regions. The transition region oscillations above magnetic knots are mainly concentrated in the 3 – 6 mHz range, and those above moderate-field patches are concentrated below 3 mHz.

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Acknowledgements

This study was supported by Project No. 16.3.2 of ISTP SB RAS, by the Russian Foundation for Basic Research under grants 16-32-00268 mol_a and No. 15-32-20504 mol_a_ved. We acknowledge the NASA/SDO Science Team for providing the data. We are grateful to the highly skilled anonymous referee, whose valuable remarks and suggestions helped us to greatly improve the article.

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  1. Institute of Solar–Terrestrial Physics of Siberian Branch of Russian Academy of Sciences, Irkutsk, Russia

    A. A. Chelpanov, N. I. Kobanov & D. Y. Kolobov

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  1. A. A. Chelpanov
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  2. N. I. Kobanov
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  3. D. Y. Kolobov
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Correspondence to A. A. Chelpanov.

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Waves in the Solar Corona: From Microphysics to Macrophysics.

Guest Editors: Valery M. Nakariakov, David J. Pascoe, and Robert A. Sych.

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Chelpanov, A.A., Kobanov, N.I. & Kolobov, D.Y. Influence of the Magnetic Field on Oscillation Spectra in Solar Faculae. Sol Phys 291, 3329–3338 (2016). https://doi.org/10.1007/s11207-016-0954-6

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