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.