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Transport des protons dans l'ionosphère aurorale

Abstract : The suprathermal electrons and protons coming from the Sun and precipitating into the high latitude atmosphere are an energy source of the Earth' s ionosphere. These particles interact with the ambient thermal gas through collisions. The Boltzmann equation providing particle fluxes in altitude, energy and pitch angle allows one of the most complete descriptions of the transport of these particles. We demonstrate it again in the dissipative case, the most general one, and we propose an original resolution of transport equations of protons and hydrogen atoms: these equations are coupled via charge-changing reactions. This resolution based on the introduction of dissipative forces to describe the energetic degradation of precipitating particles allows to take into account the angular redistributions of collisionnal or magnetic origin, neglected until now. Nevertheless their effect has been observed from ground on the H atom emissions as the red shift of the magnetic-zenith Doppler profile attests it. The resolution adopted here is validated by comparison with another model in the classical case of no angular redistribution. The influence of magnetic mirroring effect is discussed: this effect does not seem sufficient to explain alone the observed red shift. The collisionnal angular redistribution has then to play a significant role. At last a comparison of our model with Proton 1 rocket data is proposed.
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Submitted on : Monday, August 20, 2012 - 4:08:08 PM
Last modification on : Friday, November 6, 2020 - 4:02:05 AM
Long-term archiving on: : Wednesday, November 21, 2012 - 2:26:08 AM

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  • HAL Id : tel-00724355, version 1

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Citation

Marina Galand. Transport des protons dans l'ionosphère aurorale. Astrophysique stellaire et solaire [astro-ph.SR]. Université Joseph-Fourier - Grenoble I, 1996. Français. ⟨tel-00724355⟩

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