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Simulation de la scintillation Interstellaire des Pulsars. Caracterisation des 'Extreme Scattering Events' Observes en direction de B1937+21

Abstract : We explore in this thesis work the model of the natural turbulent ionized interstellar medium (ISM) as the origin of the Extreme Scattering Events (ESEs). It is well known that the inhomogeneities of the ionized ISM closely match the Kolmogorov spatial spectrum. In the thin screen approximation, we show first using the geometrical optics that we can produce ESEs phenomena. We make then the computation within the framework of Fresnel diffraction. We find 'pseudo'-ESEs which are not deep and don't appear simultaneously at the three simulated frequencies as in the case of the observations of the pulsar B1937+21 at Nancay radiotelescope. On the other hand, we show that the scintillation parameters obtained are in agreement with the observations and the theory. This study carried out on an `ALPHA server' is a first step necessary and important for the study of the interstellar scintillation.
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https://tel.archives-ouvertes.fr/tel-00006869
Contributor : Murad Hamidouche <>
Submitted on : Friday, September 10, 2004 - 7:54:52 PM
Last modification on : Thursday, December 10, 2020 - 12:36:57 PM
Long-term archiving on: : Friday, April 2, 2010 - 9:10:39 PM

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  • HAL Id : tel-00006869, version 1

Citation

Hamidouche Murad. Simulation de la scintillation Interstellaire des Pulsars. Caracterisation des 'Extreme Scattering Events' Observes en direction de B1937+21. Astrophysique [astro-ph]. Université d'Orléans, 2003. Français. ⟨tel-00006869⟩

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