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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2026 2verdicts
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Multi-height data reveal a dominant standing sausage mode (~1-2 mHz) and a propagating fluting mode (m=2, ~2-3.5 mHz) in pore boundary oscillations, with the first mode carrying 66-86% of the eigenvalue power.
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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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Multi-height Identification of Sausage and Fluting Eigenmodes in a Solar Pore
Multi-height data reveal a dominant standing sausage mode (~1-2 mHz) and a propagating fluting mode (m=2, ~2-3.5 mHz) in pore boundary oscillations, with the first mode carrying 66-86% of the eigenvalue power.