Abstract

The results of an investigation of a giant prominence which erupted from the northwest limb of the Sun on 1994 April 05, will be reported. The event could be traced back to a large prominence of March 19, 1994 above the east limb. The filament was located in the north-south direction when it appeared on the disk. At about 23:00 UT on April 05, the filament started slowly rising and then accelerated. The speed of the prominence was was only 75 km s^{-1} when it reached a height of about 0.5 R_ odot above the surface. Preliminary examination shows that the eruption caused a geomagnetic storm on April 07 at 20:00 UT. We study the dynamical and physical properties of the erupting prominence and obtain physical parameters of the prominence plasma. In X-rays, the region of eruption was relatively faint. After the eruption, however, there was a large void at the previous location of the prominence and an arcade formed progressively spreading from south to north along the limb. Based on the X-ray and radio observations, we determine the characteristics of the pre- and post-eruption structures.