Hot Cores in Coronal Filament Cavities

Abstract

Filaments represent cold intrusions in the corona, embedded in magnetic configurations termed ``filament cavities.'' Such cavities may occur without actually containing prominence material. A cavity then may erupt, leading to a coronal mass ejection (CME). Studies of Yohkoh soft X-ray images have previously shown that such eruptions may contain elongated high-temperature regions closely aligned with the Hα filament material. We report in this paper multi-wavelength observations of an extremely stable filament cavity, observed by Yohkoh and SOHO during July-September 1997. Hot multi-thermal structures persistently occupied the core of this large-scale polar-crown cavity