Signatures of large-scale changes associated with the May 2, 1998 halo CME

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We present the results of an analysis of multi-wavelength observations preceding the detection of the halo coronal mass ejection (CME) of May 2, 1998, observed by SOHO LASCO. This CME was associated with a large eruptive flare, which showed jet-like flows in soft X-rays. We examine the development of these and other large-scale features including transequatorial loops and dimmings seen in soft X-ray images from Yohkoh, moving radio sources observed in metric and decimetric wavelengths by the Nancay Radioheliograph, Moreton waves and other features seen in H-alpha images from Kanzelhöhe and SOONSPOT, coronal waves and dimmings seen in EUV images from SOHO EIT, and hard X-ray sources observed by Yohkoh. From this analysis we discuss the relation between the flare, the inferred coronal shock waves, the large-scale structural changes, and the CME. S.P. is funded by the Academy of Finland Contract No. 42576.

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