Fig. 3


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a) Solar type II radio burst recorded on November 3, 1997, by the OSRA radiospectrograph of the Astrophysikalishes Institut Potsdam at Tremsdorf. Fundamental and harmonic emission bands are indicated (type II F and type II H, respectively). Most often, the onset of type II burst is tightly related to the type III burst. Note that at the y-axis of the spectrum frequencies are presented in the reverse order to give a better impression of disturbance propagating outwars. b) Early stage of the eruption of January 17, 2010, recorded by EUVI-B instrument onboard STEREO-B mission. The coronal shock front is indicated by arrows, the expanding driver by black pluses. The on-disc signature of the shock is marked as EUV wave (for details see Veronig et al., 2010). c) Moreton wave recorded by the Sonnenobservatorium Kanzelhöhe (University of Graz) on May 2, 1998 (for details see Warmuth et al., 2001). The associated flare, usually being also the source of a CME, is also indicated.

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