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Impedance of a Small VLF Dipole in the Ionosphere
Author(s) -
deWolf D. A.
Publication year - 1966
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1002/rds196615571
Subject(s) - dipole , ionosphere , collision frequency , plasma , physics , computational physics , electron , magneto , magnetic field , magnetic dipole , atomic physics , quantum electrodynamics , geophysics , quantum mechanics , voltage
Previous workers have shown that by taking into account the nonzero dimensions of actual dipoles the infinity catastrophes of the impedance of VLF dipoles ( X ≫ 1, Y ≫ 1) in a magneto plasma, as well as of the far fields, are eliminated. Nevertheless, the use of very small dipoles may still not lead to valid result if collisionless magneto‐ionic theory is utilized. Criteria are established for temperature and collision effects whiCh modify magneto‐ionic results, depending on the relative magnitudes of source dimensiOns, electron temperature, and collision frequency. Ion mobility effects are not taken into account. In the extreme case, radiation of very .small dipoles in a sparse low‐temperature plasma with high d‐c magnetic field cannot be predicted by lineanzed plasma‐kinetic theory.