title: Tangential Field Changes in the Great Flare of 1990 May 24.
abstract: We examine the great (solar) flare of 1990 May 24 that occurred in active region NOAA 6063. The Big Bear Solar Observatory videomagnetograph Stokes V and I images show a change in the longitudinal field before and after the flare. Since the flare occurred near the limb, the change reflects a rearrangement of the tangential components of the magnetic field. These observations lack the 180 degrees ambiguity that characterizes vector magnetograms.
authors.initials: R
authors.lastname: Cameron
authors.initials: I
authors.lastname: Sammis