Radiation from a Charged Particle Spiraling in a Cold Magnetoplasma

Influence of Magnetoplasma on Gyro-Synchrotron Radiation

“…Asymptotic behaviour of electromagnetic fields at great distance from the source is given by using a Green tensor and a Fourier transformation. The method developed here is different from that of Eidman(1958), Liemohn(1965) andMansfield (1967), and is similar to that of Bunkin (1957) and Mckenzie (1964). We find the frequency spectra of the radiation power of both ordinary and extraordinary waves for various values of electron energy and ambient plasma parameters in order to discuss the influence of the magnetoplasma on the gyro-synchrotron radiation.…”

“…Bunkin (1957) and Mckenzie (1964), who introduced a Green tensor and a Fourier transformation respectively, found an asymptotic expression of electromagnetic fields at great distance from a source in a cold and collisionless magnetoplasma. Another method by using a Fourier transformation was developed by Mansfield (1967). Asymptotic solutions in a collisionless thermal magnetoplasma were also obtained by Pakhomov, Aleksin, andStepanov (1962,1963a, b).…”

Slow Z-mode radiation from sounder-accelerated electrons

“…This paper follows an approach often used in the literature to find a solution of the inhomogeneous wave equation written in terms of E(r,t), the wave field at position r and at time t radiated by the external current density jðr; tÞ of an energetic electron. Fourier-transformed to wave-vector k space and to the frequency o domain (McKenzie, 1966;Mansfield, 1967;Farrell and Goertz, 1990), the wave equation becomes…”

Recent results from studies of electron beam phenomena in space plasmas

“…Studies in the past of naturally occurring plasma waves and particle distributions using the formulation of Mansfield (1967) and McKenzie (1967) led to the conclusion that incoherent Cherenkov radiation (the radiation from each electron is added incoherently) was several orders of magnitude lower than observed (Taylor and Shawhan, 1974). Because the power radiated by coherent radiation is proportional to N', where N is the number of particles, while the power from incoherent radiation is proportional to N, an assumption of some coherency will increase the power and bring it in agreement with observations.…”

“…We pay particular attention to whistler wave generation in ionospheric plasmas and to the limits on the electron beam energy for wave generation in the two principal resonances, Landau resonance and cyclotron resonance. The "standard" way of calculating the radiation from a single particle spiralling in a magnetized cold background plasma is to solve Maxwell's equations with the moving particle as the current source (Mansfield, 1967;McKenzie, 1967). In this treatment, the radiation is found to be particularly intense for waves satisfying the resonance condition :…”