Radiation-driven diffusive transport of fast electrons in solar flares

被引:0
作者
Duclous, R. [1 ]
Tikhonchuk, V. [2 ,3 ]
Gremillet, L. [1 ,4 ]
Martinez, B. [5 ]
Leroy, T. [1 ]
Laborde, P. -E. Masson [1 ]
Pain, J. -C. [1 ,4 ]
Decoster, A. [1 ]
机构
[1] CEA, DAM, DIF, F-91297 Arpajon, France
[2] Univ Bordeaux, Ctr Lasers Intenses & Applicat, CNRS, CEA, F-33105 Talence, France
[3] Extreme Light Infrastruct ERIC, ELI Beamlines Facil, Dolni Brezany 25241, Czech Republic
[4] Univ Paris Saclay, CEA, LMCE, F-91680 Bruyeres Le Chatel, France
[5] GoLP Inst Plasmas & Fusao Nucl, Inst Super Tecn, Univ Lisboa, P-1049001 Lisbon, Portugal
基金
欧洲研究理事会;
关键词
X-RAY SOURCE; ENERGETIC ELECTRONS; FERMI ACCELERATION; AUGUST; 24; RADIO; TOP; BREMSSTRAHLUNG; SCATTERING; PARTICLES; EMISSION;
D O I
10.1063/5.0162336
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Fast electron scattering on plasma ions due to stimulated Bremsstrahlung is investigated and modeled. Comparison with Coulomb scattering suggests that stimulated Bremsstrahlung scattering can be dominant in low-density, radiation-driven plasmas, provided that the radiation spectrum has a sufficiently high brightness temperature in the neighborhood of the plasma frequency. While stimulated Bremsstrahlung scattering cannot be easily observed in laboratory plasmas due to their small size, it should operate in large-scale astrophysical plasmas, such as those met in the flaring solar corona. The effect of the solar microwave radiation on fast-electron scattering is evaluated through a parameterized flaring corona model. We find that stimulated Bremsstrahlung greatly enhances the fast-electron scattering frequency in the flare magnetic loop, leading the transport of deka-keV electrons to occur in the diffusion regime, characterized by significant precipitation rates. This prediction is consistent with the interpretation of the above-loop-top hard x-ray and microwave emissions from the X3.1 flare of August 24, 2002. Our analysis indicates that stimulated Bremsstrahlung may play an essential role in the dynamics of fast electrons trapped in solar flare loops.
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页数:15
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