Multi-wavelength Fibril Dynamics and Oscillations Above Sunspot - I. Morphological Signature

TL;DR

This study investigates the dynamic behavior of a solar chromospheric fibril across multiple wavelengths, revealing oscillation modes and magnetic structures that elucidate the interaction between different solar atmospheric layers.

Contribution

It provides a detailed multi-wavelength analysis of fibril oscillations and magnetic structures, offering new insights into the propagation of oscillations along magnetic flux tubes.

Findings

Oscillation modes observed in fibril ejections and magnetic field lines.

Distinct 3, 5, 7, 10, and 15-minute oscillation patterns linked to different regions.

Fibrils act as interaction fabric between solar atmospheric layers.

Abstract

In this work we selected one particular fibril from a high resolution solar chromosphere observation from the Dutch Open Telescope, and tried to obtain a broad picture of the intricate mechanism that might be incorporated in the multiple layer of the Solar atmosphere in high cadence multi-wavelength observation. We analyzed the changingvfibril patter using multi-wavelength tomography, which consists of both H$\alpha$ line center \& the blue wing, Doppler-signal, Ca II H, and the G-band. We have found that the intermittent ejected material through fibril from Doppler images has clearly shown oscillation mode, as seen in the H$\alpha$ blue wing. The oscillations in the umbrae and penumbrae magnetic field lines that are above the sunspot cause a broadening and forms the area like a ring shape from 3 to 15-minute oscillations as function of height. These made a distinct boundary of umbrae and penumbrae which suggest the comb structure, and indicate that the oscillations could propagate along the inclined magnetic flux tubes from below. The 3-minute strongly appeared in the broadly inclined penumbrae magnetic filed lines and gave the clear light-bridge. The well known 5-minute was dominated in the umbrae-penumbrae region boundary, the long 7-minute one was transparent in the H$\alpha$ blue wing, but this was the same with 10 and 15-minute, it was concentrated in the inner-penumbrae, as seen in the H$\alpha$ line center. From these findings we propose a picture on the role of fibril as the fabric of interaction between the layers, also the related activites around the active region under investigation.