# Relationships Between Sequential Chromospheric Brightening and the Corona

## TL;DR

This paper reviews the relationship between sequential chromospheric brightenings (SCBs) and solar eruptions, highlighting SCBs as early indicators of coronal mass ejections and exploring their characteristics through observational studies.

## Contribution

It provides a comprehensive review of SCBs, emphasizing their potential as early indicators of solar eruptions and integrating recent observational findings.

## Key findings

- SCBs are early indicators of CMEs.
- SCBs appear at the onset of flare eruptions.
- They are transient features reflecting pre-eruption conditions.

## Abstract

The chromosphere is a complex region that acts as an intermediary between the magnetic flux emergence in the photosphere and the magnetic features seen in the corona. Large eruptions in the chromosphere of flares and filaments are often accompanied by ejections of coronal mass off the sun. Several studies have observed fast-moving progressive trains of compact bright points (called Sequential Chromospheric Brightenings or SCBs) streaming away from chromospheric flares that also produce a coronal mass ejection (CME). In this work, we review studies of SCBs and search for commonalties between them. We place these findings into a larger context with contemporary chromospheric and coronal observations. SCBs are fleeting indicators of the solar atmospheric environment as it existed before their associated eruption. Since they appear at the very outset of a flare eruption, SCBs are good early indication of a CME measured in the chromosphere.