Development of Technique to Detect and Classify Small-Scale Magnetic Flux Cancellation and Rapid Blueshifted Excursions

TL;DR

This paper introduces improved tools for detecting small-scale magnetic cancellations and rapid blueshifted excursions (RBEs) in solar observations, enabling better analysis of their properties and correlations.

Contribution

The authors develop enhanced detection algorithms for magnetic cancellations and RBEs, improving accuracy and enabling detailed statistical and correlation analysis.

Findings

Identified statistical properties of magnetic cancellations and RBEs.

Established correlations between magnetic cancellations and RBEs.

Demonstrated effectiveness of new detection tools on coordinated solar observations.

Abstract

We present a set of tools for detecting small-scale solar magnetic cancellations and the disk counterpart of type II spicules (the so-called Rapid Blueshifted Excursions (RBEs)), using line-of-sight photospheric magnetograms and chromospheric spectroscopic observations, respectively. For tracking magnetic cancellation, we improve the Southwest Automatic Magnetic Identification Suite (SWAMIS) so that it is able to detect certain obscure cancellations that can be easily missed. For detecting RBEs, we use a normalized reference profile to reduce false-positive detections caused by the non-uniform background and seeing condition. Similar to the magnetic feature tracking in SWAMIS, we apply a dual-threshold method to enhance the accuracy of RBE detection. These tools are employed to analyze our coordinated observations using the Interferometric BIdimensional Spectrometer at Dunn Solar Telescope (DST) of the National Solar Observatory (NSO) and Hinode. We present the statistical properties of magnetic cancellations and RBEs, and explore their correlation using this data set.