Superactive region AR 5395 of solar cycle 22

Abstract

During the ascending phase of solar cycle 22, the NOAA active region AR 5395 of March 1989 was responsible for a sudden jump in solar activity. The evolution of the active region during its its three successive rotations (viz., AR 5354, AR 5395, and AR 5411) across the solar disk manifests the dominant role of the above active region; in other words, the active region was excitingly active (superactive region). To illustrate this, a brief description of the flare activity and the associated phenomenon from the region is given on the basis of worldwide ground-based and satellite observations. Maganetic characteristics of the group have been discussed to show the development of flare activity with respect to the twisting index of the magnetic neutral line.