Hot cores in coronal filament cavities Original Research Article

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.