Multispacecraft Observations of 2022 February 8 Prominence Cavity Eruption

Abstract Helmet streamers are common structures that shape the corona at the largest scales, as observed in eclipse and white-light images. Helmet streamers overlie one cavity embedding a prominence channel and are surrounded by an open field of opposite-polarity coronal holes. In this study, we present multispacecraft observations of a spectacular prominence-cavity eruption from the southeastern solar limb accompanied by a geoeffective coronal mass ejection (CME), observed by the Solar Dynamics Observatory, Solar Terrestrial Relations Observatory, Solar Orbiter, Advanced Composition Explorer, and Wind . We produce 3D magnetic field configurations before and during the eruption using the flux-rope insertion method and magnetofrictional relaxation that are consistent with the observations. We also performed a differential emission measure analysis to study the thermal structure of the helmet streamer prominence-cavity region before and after the eruption. We note that because of the considerable length of the prominence, it was possible to capture the eruption using in situ measurements by multiple spacecraft. Moreover, our multispacecraft in situ analysis shows that the CME propagating in the precondition medium varies as a function of longitude in the heliosphere.