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We present a case study of the 13 July 2004 solar event, in whichdisturbances caused by eruption of a filament from an active region embraced aquarter of the visible solar surface. Remarkable are absorption phenomenaobserved in the SOHO/EIT 304 A channel; they were also visible in the EIT 195 Achannel, in the H-alpha line, and even in total radio flux records. Coronal andMoreton waves were also observed. Multi-spectral data allowed reconstructing anoverall picture of the event. An explosive filament eruption and relatedimpulsive flare produced a CME and blast shock, both of which decelerated andpropagated independently. Coronal and Moreton waves were kinematically closeand both decelerated in accordance with an expected motion of the coronal blastshock. The CME did not resemble a classical three-component structure,probably, because some part of the ejected mass fell back onto the Sun.Quantitative evaluations from different observations provide close estimates ofthe falling mass, ~3 10^15 g, which is close to the estimated mass of the CME.The falling material was responsible for the observed large-scale absorptionphenomena, in particular, shallow widespread moving dimmings observed at 195 A.By contrast, deep quasi-stationary dimmings observed in this band near theeruption center were due to plasma density decrease in coronal structures.

Absorption Phenomena and a Probable Blast Wave in the 13 July 2004 Eruptive Event