Emission of a bounded nonmonoenergetic electron beam injected in the ionosphere

Citation
B. Lundin et C. Kraft, Emission of a bounded nonmonoenergetic electron beam injected in the ionosphere, J GEO R-S P, 104(A1), 1999, pp. 143-151
Citations number
18
Categorie Soggetti
Space Sciences
Journal title
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
ISSN journal
21699380 → ACNP
Volume
104
Issue
A1
Year of publication
1999
Pages
143 - 151
Database
ISI
SICI code
0148-0227(19990101)104:A1<143:EOABNE>2.0.ZU;2-O
Abstract
The amplitude of the electromagnetic field radiated (as an imposed antenna current) by a semi-infinite rarefied nonmonoenergetic electron beam artific ially injected from a satellite into the Earth ionosphere is calculated far from the injection point (near the remote receiver) by the use of a two-di mensional Stationary Phase Point method. The Stationary Phase Point, which gives the main contribution to the radiated field near the remote receiver, is defined by two variables: the parallel beam velocity u and the frequenc y w of the radiated signal.. The size of its vicinity, {delta u, delta w}(2 D), governing the wave packet amplitude far from the beam, is inversely pro portional to the transverse distance of the receiver to the beam axis. A qu alitative scheme of formation of the wave field near the remote receiver is discussed for different Limiting cases on the level of beam monoenergetici ty and spectral characteristics of the remote receiver.