Propagation of cosmic rays through interplanetary medium
Other Title(s)
انتقال جسيمات الأشعة الكونية في الفضاء بين الكواكب
Dissertant
al-Samirrai, Umar Ahmad Abd al-Nabi
Thesis advisor
al-Birmani, Muhammad Jafar Fadil
University
University of Baghdad
Faculty
College of Science
Department
Astronomy and Space Department
University Country
Iraq
Degree
Master
Degree Date
2005
English Abstract
The methods of propagation of cosmic rays in the solar system through the interplanetary magnetic field have been studied.
Convection diffusion and adiabatic deceleration.
The mechanism of modulation of galactic cosmic particles of very high energy > 30 GeV is investigated. The one dimensional transport equation had been solved numerically by the finite difference methods, by using the explicit and implicit methods. The time-dependent convection-diffusion equation solved by the FTCS method, i.e., the forward in time and centered in space.
This equation was solved under the assumption of constant diffusion coefficient and constant solar wind velocity and zero source term.
The results of this solution shows the behavior of the mean distribution function as a function of heliocentric radial distance. The one dimensional time-dependent transport equation (convection-diffusion and adiabatic-deceleration) and Compton-Getting factor was solved by the Implicit Crank-Nicolson method.
The distribution function obtained under the assumption of constant diffusion coefficient and constant solar wind velocity and zero source term, shows a Gaussian distribution in terms of heliocentric radial distance. Finally the Steady-State equation was solved by the Implicit Crank-Nicolson method.
The solution was performed under the following assumption: 1.
The radial component of the diffusion coefficient is of the form k = k ( p )rb o , where b >0 , b = 0 , and b >0 . 2.
The solar wind velocity is assumed exponential function of radial distance.
V =Vo éë1- exp(-13.862r )ùû 3.
Zero source term. The distribution function was obtained in terms of kinetic energy of cosmic particles.
The spectrum of cosmic particles in terms of kinetic energy was obtained from imperial formula.
The distribution function increases with the ratio A/Z (mass number to charge number of cosmic particles).
Main Subjects
No. of Pages
67
Table of Contents
Table of contents.
Abstract.
Abstract in Arabic.
Chapter One : General introduction and review.
Chapter Two : Theoretical models of cosmic ray transport.
Chapter Three : Numerical methods of analysis.
Chapter Four : Results and discussion.
Chapter Five : Conclusions and future work.
References.
American Psychological Association (APA)
al-Samirrai, Umar Ahmad Abd al-Nabi. (2005). Propagation of cosmic rays through interplanetary medium. (Master's theses Theses and Dissertations Master). University of Baghdad, Iraq
https://search.emarefa.net/detail/BIM-603346
Modern Language Association (MLA)
al-Samirrai, Umar Ahmad Abd al-Nabi. Propagation of cosmic rays through interplanetary medium. (Master's theses Theses and Dissertations Master). University of Baghdad. (2005).
https://search.emarefa.net/detail/BIM-603346
American Medical Association (AMA)
al-Samirrai, Umar Ahmad Abd al-Nabi. (2005). Propagation of cosmic rays through interplanetary medium. (Master's theses Theses and Dissertations Master). University of Baghdad, Iraq
https://search.emarefa.net/detail/BIM-603346
Language
English
Data Type
Arab Theses
Record ID
BIM-603346
