Atomic Nuclear Physics

Plasma Waves in the Magnetosphere by Professor Dr. A. D. M. Walker (auth.)

By Professor Dr. A. D. M. Walker (auth.)

This booklet is a research of plasma waves that are saw within the earth's magnetosphere. The emphasis is on an intensive, yet concise, remedy of the mandatory thought and using this idea to appreciate the manifold sorts of waves that are saw via ground-based tools and via satellites. We limit our therapy to waves with wavelengths brief in comparison with the spatial scales of the historical past plasma within the magazine­ netosphere. via so doing we exclude huge scale magnetohydrodynamic phenomena comparable to ULF pulsations within the Pc2-5 levels. the sphere is an energetic one and we can't desire to debate each wave phenomenon ever saw within the magnetosphere! we attempt in its place to offer an outstanding remedy of phenomena that are good understood, and which illustrate as many alternative elements of the idea as attainable. it really is hence was hoping to place the reader able to comprehend the present literature. The therapy is geared toward a starting graduate scholar within the box however it is was hoping that it'll even be of use as a connection with verified employees. an information of electromagnetic idea and a few simple plasma physics is thought. The mathematical historical past required in­ cludes a data of vector calculus, linear algebra, and Fourier trans­ shape thought encountered in typical undergraduate physics curricula. a cheap acquaintance with the speculation of services of a fancy vari­ capable together with contour integration and the residue theorem is assumed.

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We can, without any loss of generality, choose the directions of the x- and y-axes so that k lies in the x - z plane. Then kx = k sin (), ky = 0 and kz = k cos () where () is the angle measured from B to k. 57) This is a set of three homogeneous equations in Ex, Ey, E z . They are only self-consistent if the determinant of the coefficients is zero. 62) KLKRK3 This is the dispersion relation for the medium. 64) which is a form that is often used. The dispersion relation or, equivalently the refractive index formula, contains all the information about the variation of the phase of a plane electromagnetic wave in the medium.

58) are thus written as the sum of the expressions for an electron plasma with the addition of ion terms. It is again convenient to multiply them by 1 - y2. The ion terms are only important when Y ~ 1 and this approximation is used only in the ion terms. Thus at high frequency the electron terms dominate in the form previously derived while at low frequencies the approximate expressions for the ion terms become important. 73) The case of a plasma with one species of ion is obtained by setting TJl = 1, = 0, i :j; 1.

Assume that the amplitude factor F is sharply peaked at k = k o . Where F is appreciable we can expand 1> in a Taylor series about ko: d1» 2 1> = 1>0 + ( dk 0(k - ko) + 0 [( k - ko) ] 45 In general, provided that (d1>J dk)o is not too small, the integrand oscillates, there is cancellation and a small contribution to the integral. The component waves in the spectrum interfere destructively. If the phase does not depend on k there is no oscillation and no cancellation. The interference of the component waves is constructive.

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