Integral field spectroscopy of Na I D1/D2 lines reveals standing ~5.5 mHz oscillations at a sunspot umbral center indicating resonance-cavity dynamics, with propagating modes and damping at the boundary.
and Gough , D., 1984, `` Helioseismology: Oscillations as a Diagnostic of the Solar Interior '', \/ , 22 , 593--619
4 Pith papers cite this work. Polarity classification is still indexing.
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Magnetoacoustic cutoff frequency rises with height from 3.0 mHz at 0.38 Mm to 8.5 mHz at 1.2 Mm based on cross-wavelet analysis of IRIS Doppler velocities.
A review synthesizing Fourier, Lomb-Scargle, wavelet, synchrosqueezed, and EMD methods plus statistical tests for solar/stellar periodicity detection, with synthetic benchmark guidelines.
This review summarizes the development, techniques, and open questions in asteroseismology of solar-type stars whose oscillations are stochastically excited by surface convection.
citing papers explorer
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Standing oscillations in a resonant sunspot atmosphere captured by integral field spectroscopy
Integral field spectroscopy of Na I D1/D2 lines reveals standing ~5.5 mHz oscillations at a sunspot umbral center indicating resonance-cavity dynamics, with propagating modes and damping at the boundary.
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Height Variations of Magnetoacoustic Cutoff Frequency in the Solar Atmosphere
Magnetoacoustic cutoff frequency rises with height from 3.0 mHz at 0.38 Mm to 8.5 mHz at 1.2 Mm based on cross-wavelet analysis of IRIS Doppler velocities.
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Modern Time-Series and Spectral Methods for Analyzing Solar and Stellar Oscillatory Signals
A review synthesizing Fourier, Lomb-Scargle, wavelet, synchrosqueezed, and EMD methods plus statistical tests for solar/stellar periodicity detection, with synthetic benchmark guidelines.
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Asteroseismology of solar-type stars
This review summarizes the development, techniques, and open questions in asteroseismology of solar-type stars whose oscillations are stochastically excited by surface convection.