VLF/LF Long Wave Propagation Study

A program of ARCAS rocket measurements provided field strength data from 0 to 75 km altitude, in both Transverse Magnetic (TM) and Transverse Electric (TE) polarizations. Sky wave parameters related to survivable ground wave communications were measured at a frequency of 100 kHz, and a method of com...

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Bibliographic Details
Main Authors: Ver Planck, Peter, Kahler, Royce C., Donohoe, James B.
Other Authors: MEGAPULSE INC BEDFORD MA
Format: Text
Language:English
Published: 1981
Subjects:
Radiofrequency Wave Propagation
*GROUND WAVES(ELECTROMAGNETIC)
*IONOSPHERIC DISTURBANCES
*IONOSPHERIC PROPAGATION
*D REGION
FREQUENCY
INPUT
FUNCTIONS
PROPAGATION
MILITARY FACILITIES
PARAMETERS
RESISTANCE
LOW FREQUENCY
GREENLAND
VERY LOW FREQUENCY
BRAZIL
FIELD INTENSITY
AIRPORTS
NEW YORK
TEST METHODS
SURVIVAL(GENERAL)
ARTIFICIAL SATELLITES
LONG WAVELENGTHS
EARTH(PLANET)
*C REGION
PE62702F
WURADC46001631
Greenland
Short Ground
Thule Air Base
Thule Air
Thule
Online Access:http://www.dtic.mil/docs/citations/ADA110671
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA110671
Description
Summary:A program of ARCAS rocket measurements provided field strength data from 0 to 75 km altitude, in both Transverse Magnetic (TM) and Transverse Electric (TE) polarizations. Sky wave parameters related to survivable ground wave communications were measured at a frequency of 100 kHz, and a method of communicating with short (ground wave) pulses was demonstrated on a 230 km propagation path. Measurements were made in New York state, and in Brazil, to further define the nature of pulse reflections from ionospheric heights below the classical D-region. Instrumentation was developed to detect small changes in 100 kHz ground wave propagation velocity which might correlate with tropospheric conditions. Preliminary mechanical considerations indicate that it might be possible to deploy long center-fed dipole antennas from an earth satellite. The program of high-resolution ionosounding with TM pulses in Greenland was augmented by transmitting TE pulses from an unused powerline at Thule Air Base. It was demonstrated that the effects of ionospheric disturbances can now be observed simultaneously with both polarizations. Input resistances and reactances of the powerline antenna were measured as functions of frequency in preparation for a follow-on program of long range propagation tests.

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