The series of solar-terrestrial extra storms of May-October 2000. Structure of the bow shock layer and confuguration of the near-Earth magnetic cloud on July 15

摘要

The bow shock layer structure and magnetic cloud configuration in the near-Earth disturbance of July 15, 2000, and their relation to the configuration of the magnetic field zero lines on the source surface and in active region (AR) 9077 are studied. The set of data on the configuration of this coronal-interplanetary disturbance is systematized. It has been indicated that the bow shock layer consists of a typical [Ivanov et al., 1974] succession of quasiparallel discontinuities including the magnetic cloud boundary. Model concepts of a cloud configuration are specified using the general method for testing magnetic cloud models. The method is based on a comparison of model directions of the normal to the cloud boundary with experimental directions determined at points where a satellite enters a cloud. It has been indicated that, in the class of circular cylinders, nonforce-free models of a cloud give closer directions of the normal and cloud axis on July 15 to experimental directions than force-free models. It has been found out that the axis of the near-Earth cloud, zero line (heliospheric current sheet, HCS) on the source surface, and eastern and western fragments of the photospheric field zero line in AR 9077 are parallel to one another. It has been indicated that the configuration characteristics of the zero lines, flare ribbons, dimmings, radioemission at f = 164 MHz, white light coronal ejection, interplanetary IPS disturbance, and magnetic cloud are arranged along and across HCS.