On upward motions of coronal hard X-ray sources in solar flares

被引：4
|
作者：
Somov, BV
Kosugi, T
Bogachev, SA
Masuda, S
Sakao, T
机构：
[1] Moscow MV Lomonosov State Univ, Inst Astron, Univ Prospekt 13, Moscow 119992, Russia
[2] Japan Aerosp Explorat Agcy, Inst Space & Aeronaut Sci, 3-1-1 Yoshinodai, Kanagawa 2298510, Japan
[3] Nagoya Univ, Solar Terr Environm Lab, 3-13 Honohara, Aichi 4428507, Japan
来源：
ENERGY RELEASE AND PARTICLE ACCELERATION AT THE SUN AND IN THE HELIOSPHERE | 2005年 / 35卷 / 10期
关键词：
sun; magnetic fields; flares; acceleration of particles; X-rays; MAGNETIC RECONNECTION; PARTICLE-ACCELERATION; YOHKOH OBSERVATIONS; A MISSION; RHESSI;
D O I：
10.1016/j.asr.2005.05.075
中图分类号：
V [航空、航天];
学科分类号：
08 ; 0825 ;
摘要：
Coronal hard X-ray (HXR) sources were discovered by the Yohkoh HXT telescope in about two dozen limb flares: Impulsive and gradual ones. On the basis of HXT data, we investigated the spatial evolution of coronal sources. Slow ascending motions of sources are seen in several flares. In five events, it was possible to estimate the velocity of the upward motion with values between 10 and 30 km/s. We present these observational results and conclude that coronal source motions should be studied statistically using the RHESSI high-resolution HXR imaging data. We discuss the possibility that coronal HXR emission is generated as bremsstrahlung of the fast electrons accelerated in collapsing magnetic traps due to joint action of the Fermi-type first-order mechanism and betatron acceleration. (c) 2005 COSPAR. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：1690 / +
页数：3
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