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EP: Fachverband Extraterrestrische Physik

EP 10: Poster Session

EP 10.22: Poster

Donnerstag, 3. April 2025, 11:00–12:30, ZHG Foyer 1. OG

A new categorization of coronal dimmings — •Bernhard Kliem and the ISSI Team Coronal Dimmings — University of Potsdam, Institute of Physics and Astronomy, 14476 Potsdam

A new, physics-based categorization of coronal dimmings has recently been proposed by an ISSI International Team "Coronal dimmings and their relevance to the physics of solar and stellar coronal mass ejections" (Veronig, Dissauer, Kliem, Downs et al. 2025, LRSP, subm.) The new categories were defined by considering the magnetic flux systems involved in solar coronal mass ejections (CMEs) and the principal magnetic reconnection processes between them. These are proposed to replace the morphology-based traditional categories of Core and Secondary Dimmings. They are expected to aid the physical interpretation of the often complex dimming morphologies. The flux systems are: the erupting core flux (a magnetic flux rope, MFR), the strapping flux (external poloidal field) yielding force-free MFR equilibrium, closed exterior flux, and open flux (an ambient coronal hole). The principal reconnection processes are: strapping-strapping ("flare") reconnection, rope-strapping reconnection, rope-exterior reconnection, rope-open-flux reconnection, and leg-leg reconnection of the erupting flux rope. These lead to Stationary, Shrinking, and Moving Flux-rope Dimmings, Strapping-flux Dimmings, Exterior Dimmings, and Open-flux Dimmings. Schematics and illustrative examples will be shown.

Keywords: Solar eruptions; Coronal mass ejections (CMEs)