Dynamical phenomena associated with a coronal mass ejection

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Observations

Scientific paper

The flare-CME-shock relationship has been controversial for more than two decades. This issue was traditionally addressed using white light coronagraphic data on CMEs, H-alpha or GOES data on flares and radio spectrographic data on shocks (inferred from metric type II radio bursts). A wealth of new information has become available after the advent of Yohkoh, SOHO and WIND missions that can be used to address the dynamical phenomena associated with CMEs. We present multiwavelength observations of the 1998 April 27 CME associated with coronal dimming, an X-class flare and type II radio bursts. We find that the coronal dimming observed in X-rays and EUV is indeed a CME signature and that the CME clearly precedes the accompanying flare.

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