Ground level signal strength of electromagnetic waves generated by pulsed electron beams in space

Details Ground level signal strength of electromagnetic waves generated by pulsed electron beams in space Ground level signal strength of electromagnetic waves generated by pulsed electron beams in space

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39.1527h&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 39, Nov. 1991, p. 1527-1535.

Computer Science

4

Earth Ionosphere, Electromagnetic Radiation, Electron Beams, Pulsed Radiation, Spontaneous Emission, Asymptotic Methods, Earth Surface, Snells Law, Wave Interaction

Scientific paper

A theoretical study has been made of the signal strengths at ground level of waves generated by pulsed electron beams in space. The radiated energy is first calculated by an improved version of a theory based on coherent spontaneous emission. This theory evaluates the electric and magnetic field strengths and power fluxes in the far field by applying asymptotic expansion techniques. The power flowing out within a cone whose apex is located at the gun position is calculated, and the intersection of the rays in this cone with the earth's surface is determined by using Snell's law considerations. Ground signal levels are calculated for typical ionospheric conditions as a function of pulsing frequency for fixed beam voltage and for voltage adjusted for resonance between the waves and the particles. For short beams, the ground level signal strengths are relatively insensitive to the wave particle resonance condition, but for longer beams the associated peaking of the signal level begins to be observed. Finally, these results are compared against ambient noise levels to determine under which circumstances these ground signals can be detected.

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