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A diagnostic system for the study of extremely long wavelength emission produced by ionospheric modification
Author(s) -
Baker M. R.,
Collins T. W.,
Lee H. S.,
Ferraro A. J.
Publication year - 1990
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 - 10.1029/rs025i006p01369
Subject(s) - ionosphere , transmitter , high frequency , current (fluid) , computer science , remote sensing , telecommunications , electrical engineering , physics , geophysics , engineering , geology , channel (broadcasting)
This paper describes a diagnostic system developed for the study of radio signals at frequencies below 8 kHz. Of specific interest are emissions produced by high‐frequency heating of the ionosphere which modulates natural ionospheric current systems. Dual receivers allow independent reception on orthogonal loop antennas, and microcomputer systems provide real‐time data acquisition and processing of all experimental data. Provisions are also made for automatic control of modulating frequency applied to the heating transmitters; operating frequencies may be changed on a preset schedule in tandem with receiver tuning.