Causal Relation Between Hα Arch Filament Loops and Soft X-Ray Coronal Loops

Abstract

We have been studying the spatial and temporal relations between Hα arch filament system (AFS) loops and soft X-ray (SXR) coronal loops, comparing high resolution Hα images of emerging flux regions (EFRs) observed with the Domeless Solar Telescope (DST) at Hida Obs. with SXR images taken by the Soft X-ray Telescope (SXT) aboard Yohkoh. The first results of this study were published in Kawai et al. (1992, 1993), showing good spatial correspondence between Hα AFS loops and SXR bright loops especially in the youngest parts of EFRs.