Fr.: grand jet en bulbe, ~ ~ en casque prussien
A large-scale → coronal feature with apparent → cusp, seen during a → solar eclipse. They usually arise from → sunspots and → active regions, so at the base of a helmet streamer one will often find a → prominence. They form magnetic loops that connect the sunspots and suspend material above the surface of the Sun. The magnetic field lines trap the material to form the streamers. The action of the → solar wind is at the origin of the peak feature.