Determine whether fluxtube-axis inclination contributes to magnetoacoustic portals

Determine whether an overall inclination of the fluxtube axis from the photosphere to the chromosphere contributes to forming a magnetoacoustic portal, particularly near the apparent centroid shift around y = 27 arcsec, and clarify this possibility through statistical analysis.

Background

The paper interprets expanding fluxtubes as magnetoacoustic portals because their geometry can produce inclined magnetic fields at the tube periphery, lowering the acoustic cutoff frequency and permitting low-frequency waves to propagate into the chromosphere. The authors also note that an overall inclination of the fluxtube axis, potentially associated with a magnetic-loop footpoint, could contribute to the same effect.

An apparent displacement between the photospheric and chromospheric magnetic-field centroids near y = 27 arcsec may indicate such an axis inclination. However, the interpretation is complicated by the merging of two photospheric magnetic features into a single chromospheric fluxtube. The authors therefore identify the presence and role of this overall inclination as unresolved and call for further statistical analysis.