Abstract

Regular time variations of the 3 GHz radio flux observed during the April 7, 1997 flare are presented. These observations are interpreted using the current loop coalescence model the main period of the 3 GHz radio flux (about 100 s) corresponds to repetition of the current loop coalescence, and the radio double peaks are associated with maximum of the electric field component perpendicular to the interaction plane. The plasma 3 parameter in the current loop coalescence process is estimated as...

Introduction

Coronal structures play a very important role for understanding the evolution of the solar magnetic field during the solar cycle. They have a long history of investigation (Secchi 1877, d'Azambuja 1945, Waldmeier 1957, Leroy & Trellis 1974, Rusin et al. 1990, Altrock 1997). These studies reveal equatorward and poleward migrating structures in coronal emissions, that sometimes are called coronal activity waves. These observations led to a suggestion that the polar branch of activity might be...

Solar Week

Another major E PO activity resulting from the impact of Yohkoh is Solar Week. Solar Week was created with the primary aim of addressing the under-representation of women in the research and teaching of the physical sciences by specifically targeting middle-school girls. Solar Week is a daughter-site to YPOP, feeding off the YPOP Classroom activities. However, it also incorporates a number of novel features a lower level of interaction via games in addition to activities, direct interaction...

Dimensionality

Many of the diagrams and models in the literature have been strictly two-dimensional, and have been extremely successful. Surprisingly, several of the analyses which have made the greatest impact have dealt with flare structures that closely resemble the 2D cartoons e.g. Tsuneta 1996, 1997 Forbes amp Acton 1996 Aschwanden et al. 1996 Yokoyama et al. 2001 . At least one of the observations mentioned herein bears a striking resemblance to a 2.5D representation...