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.
B., Bjelksjo, K., Korhonen, T
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A multi-height extrapolation framework using chromospheric vector data recovers a pre-eruptive flux-rope configuration in an observed solar filament, outperforming photosphere-only models in simulation tests.
Shock waves from nonlinear steepening in the chromosphere drive spicules, transition to large-amplitude compressive MHD waves in the corona depending on field strength, produce PCDs, show period evolution from ~5 to >=10 minutes, and supply mass flux toward the solar wind.
CNN separation of He I 10830Å chromospheric signal from photospheric contamination in quiet Sun reveals R ≈ -0.84 anti-correlation with 304Å and magnetic-field-dependent EUV coupling.
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Chromospheric magnetic field extrapolations reveal the flux-rope configuration of a solar filament
A multi-height extrapolation framework using chromospheric vector data recovers a pre-eruptive flux-rope configuration in an observed solar filament, outperforming photosphere-only models in simulation tests.