fl199.yoshimori10 Posted: 01-Mar-95 Updated: 17-Jul-95, 08-Apr-96 Events specified: Flare of 27-Oct-91 05:40 UT
Collaboration: M.Yoshimori (yosimori@rikkyo.ac.jp), S.V.Bogovalov, Yu.D.Kotov and P.L.Ustinov
We have investigated a time delay of gamma-ray emission peak with respect to hard X-ray emission peak for the 1991 October 27 flare observed with Yohkoh. We assume a model of simultaneous injection of electrons and protons in the thick target to study acceleration processes ofelectrons and protons. The temporal evolution of X- and gamma-ray emissions are explained from this model. From the present analysis we derive physical parameters of the emission region.
Required observations: Gamma-ray and hard X-ray light curves of the 1991 October 27 flare.
Update 08-Apr-96
We have reached the goal of the proposal fl199 updated 17-July-95.
Title: "Temporal Evolution of X- and Gamma-Rays during a Flare on 27 October 1991 "
Authors: Yu.D.Kotov, S.V.Bogovalov, P.L.Ustinov and M.Yoshimori
This paper was published in Proc. of 24th International Cosmic Ray Conference vol.3 (1995) 106.
Abstract
We have investigated a time delay of gamma-ray emission peak with respect to hard X-ray emission peak for the 1991 October 27 flare. We consider a model of simultaneous injection of electrons and protons into a magnetic trapping region to investigate acceleration processes of electrons and protons. The observed time profiles of hard X- and gamma-ray emissions are not explained from a trap plus precipitation model with time independent parameters. We suggest that electrons and protons are simultaneously injected in the trapping region but protons are likely accelerated later than electrons.
Update 17-Jul-95
Yohkoh observed a peak delay of gamma-ray emission with respect to hard X-ray emission in the 1991 October 27 flare. We suggest a simple model in which simultaneous injection of electrons and protons into a magnetic trap region is taken account. This model can explain the temporal evolution of X- and gamma-ray emissions. We derive physical parameters of the emission region.
This paper is presented in the 24th International Cosmic Ray Conference (Rome, Aug.27 - Sept.8, 1995).