Hot and cool plasma ejections in the solar corona

TL;DR

This study investigates the relationship between X-ray Plasma Ejections and prominences in the solar corona, revealing limited correlation and suggesting the existence of distinct CME subclasses.

Contribution

First statistical analysis comparing XPEs and prominences, highlighting their weak association and proposing separate CME subclasses.

Findings

Less than one third of XPEs have low-temperature counterparts.

Weak correlation (20-30%) between XPEs and prominences.

High correlation (~70%) between XPEs, prominences, and CMEs.

Abstract

We present the results of the first attempt of statistical research devoted to the association between X-ray Plasma Ejections (XPEs) and prominences. For this aim, we compared contents of a catalogue of XPEs, observed by the Soft X-ray Telescope onboard Yohkoh, to H$\alpha$ reports from the Solar-Geophysical Data. We found that only less than one third of XPEs shows a low-temperature counterpart. A modest connection between hot and cool plasma motions in the corona is also supported by by a frequent discrepancy between morphology and kinematics of simultaneously occurring XPEs and prominences. We explain the poor correlation (20-30 %) between XPEs and prominences and high correlations (~70%) between these phenomena and CMEs as a proof of existence of two separate subclasses of CMEs.