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Etude de mécanismes de pertes de particules dans les ceintures artificielles de Van Allen

Abstract : Since the surprising discovery by James A. Van Allen of high-energy charged particles surrounding the earth in 1958, intense studies both theoretical and experimental have been carried out to establish the dominant physical processes governing the earth's radiation environment. The purpose of our work is to describe numerical experiments to simulate the decay and particle loss in Van Allen belts. The goal is to construct a predictable model for any arbitrary initial condition. Under the effects of collisions with atmosphere and cyclotron resonance interactions with whistler mode waves, the temporal evolution of the trapped electrons in radiation belts is described by a Fokker-Planck equation. We have developed a code that solves the phase-averaged Fokker-Planck equation of the electron momentum distribution function on magnetic shells whithin the magnetosphere. The physical arguments incorporated in the code include phase-averaged, approximate collision operators and quasilinear diffusion due to electron cyclotron resonance.
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http://docnum.univ-lorraine.fr/prive/SCD_T_1997_0304_REVEILLE.pdf
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https://hal.univ-lorraine.fr/tel-01747334
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Submitted on : Thursday, March 29, 2018 - 10:57:28 AM
Last modification on : Wednesday, March 24, 2021 - 10:22:02 AM

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  • HAL Id : tel-01747334, version 1

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Thierry Réveillé. Etude de mécanismes de pertes de particules dans les ceintures artificielles de Van Allen. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 1997. Français. ⟨NNT : 1997NAN10304⟩. ⟨tel-01747334⟩

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