Best of SOHO images Source: (note higher resolution TIF is available there) Date: 24 July 1999 Imaging Technique: He II at 304 Angstroms Title: Solar prominence
Description: Erupting prominences are perhaps the most common type of solar activity associated with coronal mass ejections (CMEs) and may play a fundamental role in the formation of CMEs. This is an image of a large, eruptive prominence as seen in ultraviolet light in ionized helium (He II) at 304Å, with an image of the Earth added for size comparison. Solar prominences are relatively cool, high density material suspended in the solar atmosphere. This prominence from 24 July 1999 is particularly large and looping, extending over 35 Earths out from the Sun. Erupting prominences are often components of CMEs, and, when Earthward directed, can affect communications, navigation systems, even power grids, while also producing auroras visible in the night skies.