COMPLEX ANALYSIS OF TWO ERUPTIVE EVENTS ASSOCIATED WITH CMEs OBSERVED ON 2 AUGUST 2000

摘要

We present the results of a detailed analysis of two eruptive events associated with CMEs occurred at the eastern solar limb on 2 August 2000. The analysis was performed on the basis of observations taken at the Astronomical Institute of Wroclaw University (Hα), SOHO/LASCO (C2 and C3), SOHO/EIT (EUV), Pic du Midi (Hα) and Meudon (Hα and Ca II). The first eruption which started at about 08:27 UT was associated with a solar flare of GOES class C7.9 and produced a faint and not very conspicuous CME. After this eruption a large quiescent prominence situated to the North from the flare on the eastern limb, was activated and strongly changed. The observed destabilization of the activated prominence, evidently caused by the first eruption, brought about to the eruption of this prominence and a large-scale CME. This second eruption occurred at about 17:50 UT. After the C7.9 flare the GOES X-ray level was rather low and oscillated between B7 and C1 through the next twenty or so hours. This evidences that the second large-scale CME was associated with the eruption of the prominence but not with a flare.