Dynamics of Chromospheric Upflows and Underlying Magnetic Fields

TL;DR

This study investigates the origin of rapid blueshifted excursions (RBEs) in the solar chromosphere, linking their occurrence to dynamic magnetic field interactions and magnetic canopy structures using high-cadence observations.

Contribution

It provides new insights into the magnetic field configurations associated with RBEs, highlighting the role of magnetic canopies and small-scale loops in their formation.

Findings

RBEs are correlated with new or mixed magnetic fields near network regions.

RBEs tend to occur at interfaces between large-scale and small-scale magnetic fields.

Detection of kinked and Y-shaped RBEs supports magnetic canopy involvement.

Abstract

We used \ha-0.1 nm and magnetic field (at 1.56$\mu$) data obtained with the New Solar Telescope to study the origin of the disk counterparts to type II spicules, so-called rapid blueshifted excursions (RBEs). The high time cadence of our chromospheric (10 s) and magnetic field (45 s) data allowed us to generate x-t plots using slits parallel to the spines of the RBEs. These plots, along with potential field extrapolation, led us to suggest that the occurrence of RBEs is generally correlated with the appearance of new, mixed or unipolar fields in close proximity to network fields. RBEs show a tendency to occur at the interface between large-scale fields and small-scale dynamic magnetic loops and thus are likely to be associated with existence of a magnetic canopy. Detection of kinked and/or inverse "Y" shaped RBEs further confirm this conclusion.