A THEORY OF INCOHERENT SCATTERING OF RADIO WAVES BY A PLASMA. II. SCATTERING IN A MAGNETIC FIELD

摘要: A general expression for the frequency spectrum of radio waves scattered by random thermal fluctuations electron density in a plasma magnetic field is derived. The derivation based on generalized Nyquist noise theorem. result simplified an approximation assuming velocity light to be infinite. It shown that this adequate ionospheric applications theory. Next it proved, without appealing any approximation, can never alter total signal power; only redistribute power over spectrum. Finally, detailed shape examined. Analytic expressions are given certain limiting cases, but cases most interest, numerical methods must used. Results calculations shown. From these results, seen has significant effect if incident beam very nearly orthogonal lines force. For example, operating 40 Mc/s, no observed even when within 5 deg orthogonality. As anglemore » decreased further, however, rapidly begins develop spikes at Doppler shifts which approximate multiples ion gyro-frequency. These quite pronounced 2 from At higher frequencies, proportionally closer orthogonality achieve same effect. (auth)« less