Evolution of the source region of the interplanetary magnetic cloud of 18–20 Oct. 1995 Original Research Article

We follow the evolution and activity of the reversed polarity AR 7912 using multi-wavelength observations. We find that the presence of high shear increased by flux emergence led to the occurrence of a long-duration eruptive flare on 14 October 1995, which was manifested in the SXR corona by an arcade of expanding sigmoidal loops. A twisted magnetic cloud was observed at 1 AU between October 18–20. We propose that it was ejected from this reversed polarity AR, and it was associated with the expanding sigmoids.