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- W2594046862 abstract "For 478 centrally located sunspots observed in the optical continuum with Solar Dynamics Observatory/Helioseismic Magnetic Imager, we perform seismological diagnostics of the physical parameters of umbral photospheres. The new technique is based on the theory of slow magnetoacoustic waves in a non-isothermally stratified photosphere with a uniform vertical magnetic field. We construct a map of the weighted frequency of three-minute oscillations inside the umbra and use it for the estimation of the Alfvén speed, plasma-beta, and mass density within the umbra. We find the umbral mean Alfvén speed ranges between 10.5 and 7.5 km s−1 and is negatively correlated with magnetic field strength. The umbral mean plasma-beta is found to range approximately between 0.65 and 1.15 and does not vary significantly from pores to mature sunspots. The mean density ranges between (1–6) × 10−4 kg m−3 and shows a strong positive correlation with magnetic field strength." @default.
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- W2594046862 date "2017-03-02" @default.
- W2594046862 modified "2023-10-02" @default.
- W2594046862 title "Determination of the Alfvén Speed and Plasma-beta Using the Seismology of Sunspot Umbra" @default.
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- W2594046862 doi "https://doi.org/10.3847/2041-8213/aa611b" @default.
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