Nobeyama Radioheliograph can observe prominences (filaments), which have relatively low temperature (10,000 K) compared with other phenomena on the Sun. This figure shows the 1992-7-31 prominence eruption. This is a composite image: The three filaments out of the limb are the snapshots at different times of a single erupting prominence: The disk image is a negative soft X-ray image, which is indicating the arcade flare after the eruption. (Reference: Hanaoka, Y. et al., 1994, PASJ 46, 205)
Movie
of 1992 July 31 Prominence Eruption (363 KB mpeg)