Solar origins of a strong stealth CME detected by Solar Orbiter

Abstract

Aims.We aim to locate the origin of a stealth coronal mass ejection (CME) detected in situ by the MAG instrument on board Solar Orbiter, and make connections between the CME observed at the Sun, and the interplanetary CME (ICME) measured in situ. Methods. Remote sensing data are analysed using advanced image processing techniques to identify the source region of the stealth CME, and the global magnetic field at the time of the eruption is examined using Potential Field Source Surface (PFSS) models. The observations of the stealth CME at the Sun are compared with the magnetic field measured by the Solar Orbiter spacecraft, and plasma properties measured by the Wind spacecraft. Results. The source of the CME is found to be a quiet Sun cavity in the northern hemisphere. We find that the stealth CME has a strong magnetic field in situ, despite originating from a quiet Sun region with an extremely weak magnetic field. Conclusions. The interaction of the ICME with its surrounding environment is the likely cause of a higher magnetic field strength measured in situ. Stealth CMEs require multi-wavelength and multi-viewpoint observations in order to confidently locate the source region, however their elusive signatures still pose many problems for space weather forecasting. The findings have implications for Solar Orbiter observing sequences with instruments such as EUI that are designed to capture stealth CMEs

6 pages, 7 figures, accepted for publication in A&A

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• Solar origins of a strong stealth CME detected by Solar Orbiter
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• Radial Evolution of the April 2020 Stealth Coronal Mass Ejection between 0.8 and 1 AU -- A Comparison of Forbush Decreases at Solar Orbiter and Earth
• Investigating Remote-sensing Techniques to Reveal Stealth Coronal Mass Ejections
• Tracking the 3D evolution of a halo coronal mass ejection using the revised cone model
• Automated detection of coronaL MAss ejecta origiNs for space weather AppliCations (ALMANAC)
• Understanding the Origins of Problem Geomagnetic Storms Associated With "Stealth" Coronal Mass Ejections
• Is there a Dynamic Difference between Stealthy and Standard CMEs?
• Predicting the Magnetic Fields of a Stealth CME Detected by Parker Solar Probe at 0.5 AU