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Energetic Relations between the Disappearing Solar Filaments and the Associated Flare Arcades

Shibata, Kazunari; Morimoto, Taro; Kurokawa, Hiroki +1 more

We present the temporal and statistical relations between the mechanical energies of disappearing solar filaments and the thermal energies of the associated flare arcades in soft X-rays. Measuring the 3-D velocity fields of 10 eruptive filaments, we calculated their mechanical energy gain rate, ɛ_mc, per unit volume and compared it to th…

Spectroscopic Studies of Limb Spicules. I Radial and Turbulent Velocities

Shoji, Makiko; Nishikawa, Takara; Kitai, Reizaburo +1 more

We made high-resolution spectroscopic observations of limb spicules in Hα using the Vertical Spectrograph of Domeless Solar Telescope at Hida Observatory. While more than half of the observed spicules have Gaussian line-profiles, some spicules have distinctly asymmetric profiles, which can be fitted to two Gaussian components. The faster component…

On the Relation between Surge Activities and a Photospheric Horizontal Velocity Field

Kitai, Reizaburo

A photospheric horizontal velocity field was observed in an active region, NOAA 8375, which showed high Hα surge activities on 1998 November 6. From analyses of Hα images, the photospheric horizontal velocity field, and the magnetic field in and around the active region, we found the following: (1) Meso-granular or supergranular photospheric horiz…