SOHO OBSERVATIONS OF A CME-DRIVEN SHOCK AND EIT WAVES

摘要

We report on observations of a CME-driven shock wave on March 5 2000 from different instruments (EIT, LASCO and UVCS) on board the Solar and Heliospheric Observatory (SOHO). The CME lift-off took place at about 16:12 UT and reached the LASCO/C2 field of view (FOV) at 17:06 UT with a speed (projected in the plane of sky) of about 860 km s-1.On-disk waves are also observed in the EIT difference images. Moreover, enhancement in intensities and widths of the Osignatures of plasma heating are also observed based on the UVCS data suggesting the presence of a driven shock wave propagating in front of the CME. Interestingly, visual evidence for the shock wave is shown based on the propagation of the kink along a streamer where no CME material is present to cause such an effect. The preliminary results on the relationship of different phenomena observed by the different instruments on SOHO are presented.