Hot and Superhot Plasmas above an Impulsive Flare Loop

1997 ◽  
Vol 478 (2) ◽  
pp. 787-798 ◽  
Author(s):  
Saku Tsuneta ◽  
Satoshi Masuda ◽  
Takeo Kosugi ◽  
Jun Sato
Keyword(s):  
Flare Loop ◽  
Impulsive Flare

Space and Time Distribution of Hard X-Ray Emission in a Loop at the Beginning of a Flare

1994 ◽  
Vol 144 ◽  
pp. 275-277
Author(s):  
M. Karlický ◽  
J. C. Hénoux
Keyword(s):  
Time Distribution ◽  
Electron Bombardment ◽  
Spatial Evolution ◽  
Superthermal Electrons ◽  
Flare Loop ◽  
X Ray ◽  
Superthermal Electron ◽  
Flare Loops ◽  
Chromospheric Evaporation ◽  
Temporal And Spatial

AbstractUsing a new ID hybrid model of the electron bombardment in flare loops, we study not only the evolution of densities, plasma velocities and temperatures in the loop, but also the temporal and spatial evolution of hard X-ray emission. In the present paper a continuous bombardment by electrons isotropically accelerated at the top of flare loop with a power-law injection distribution function is considered. The computations include the effects of the return-current that reduces significantly the depth of the chromospheric layer which is evaporated. The present modelling is made with superthermal electron parameters corresponding to the classical resistivity regime for an input energy flux of superthermal electrons of 109erg cm−2s−1. It was found that due to the electron bombardment the two chromospheric evaporation waves are generated at both feet of the loop and they propagate up to the top, where they collide and cause temporary density and hard X-ray enhancements.

Kinematics of a System of Loop Prominences

1979 ◽  
Vol 44 ◽  
pp. 237-241 ◽  
Author(s):  
O. Engvold ◽  
E. Jensen ◽  
B.N. Andersen
Keyword(s):  
Loop System ◽  
Mass Motion ◽  
Flare Loop ◽  
Doppler Effects ◽  
Rare Phenomena ◽  
True Mass

A detailed description of the development of loops connected with flares has been given by Bruzek (1964). Data on true mass motion as inferred from Doppler-effects are sparse in the literature as flare loop prominences are rare phenomena (Kleczek 1965). Jefferies and Orrall (1965) reported high velocities near the top of a loop system. Gurtovenko et al. (1969) observed large Doppler velocities in the loop system of July 11th. 1966.

Temporal variation of 2D multi-parameter fields of a post-flare loop system

New Astronomy ◽  
2003 ◽  
Vol 8 (5) ◽  
pp. 427-437 ◽  
Author(s):  
X.M. Gu ◽  
J.P. Dun ◽  
S.H. Zhong
Keyword(s):  
Temporal Variation ◽  
Loop System ◽  
Flare Loop

2002 AUGUST 24 LIMB FLARE LOOP: DYNAMICS OF MICROWAVE BRIGHTNESS DISTRIBUTION

2009 ◽  
Vol 697 (1) ◽  
pp. 735-746 ◽  
Author(s):  
V. E. Reznikova ◽  
V. F. Melnikov ◽  
K. Shibasaki ◽  
S. P. Gorbikov ◽  
N. P. Pyatakov ◽  
...  
Keyword(s):  
Brightness Distribution ◽  
Flare Loop ◽  
Loop Dynamics ◽  
Limb Flare

scholarly journals Energetic Particles in a Flare Loop: Spectra and Radiation Signatures

1990 ◽  
Vol 142 ◽  
pp. 421-427
Author(s):  
P. A. Bespalov ◽  
V. V. Zaitsev ◽  
A. V. Stepanov
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Propagation Model ◽  
Source Spectrum ◽  
High Energy Particle ◽  
Particle Interactions ◽  
Flare Loop ◽  
Energetic Ions ◽  
Particle Spectra ◽  
One Step

It has been shown that high energy particle spectra, particle dynamics, and radiation in a flare loop are determined by wave-particle interactions. The electron-whistler interaction occurs under conditions of strong pitch angle diffusion that makes the particle distribution function isotropic. The flare loop electrons retain information about the particle source spectrum. The interaction of energetic ions with Alfven waves is characterized by strong, moderate, and weak diffusion. The time delays in hard X-ray and gamma-ray emission during one-step acceleration processes might be understood in terms of a trap-plus-turbulent propagation model. The density of precipitating particles is less than or equal to the trapping one. Radiation signatures of flare loop electrons are discussed.

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