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The temperature of the ionosphere in the auroral zone


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Dowden, R. L 1958 , 'The temperature of the ionosphere in the auroral zone', Unspecified thesis, University of Tasmania.

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In the absence of man-made interference and atmospherics, it
has been found possible to measure radio frequency thermal radiation from
the ionosphere at medium frequencies.
The temperature of the ionospheric D-region has been previously
measured by this method at 2 Mc/s in temperate latitudes (Pawsey, McCreddy
and Gardner, 1951, and Gardner, 1954). In a companion paper (Gardner and
Pawsey, 1953), the absorbing structure of the lower ionosphere was determined
from D-region echoes to find the heights to which the temperatures
applied. However, it was felt that conditions might be very different in
an auroral zone. Echoes from the D6-region (apparently) of much greater
intensity and at only half the height of those observed by the above authors,
were reported at Macquarie Island which is close to the centre of the
auroral zone.
Experiments were carried out by the author at the Australian
National Antarctic Research Station at Macquarie Island as a member of the
1956 party. The apparent D-region echoes mentioned above were found to be
not from the ionosphere, however, but from sea waves (Dowden, 1957). This
thesis describes radio noise experiments at a number of medium frequencies
carried out at a site twenty miles from the Main Station where interference
was negligible.
This thesis is divided into two parts. The first part
describes observations of high accuracy at 2 Mc/s using a half wave dipole
aerial to provide a direct comparison with Gardner's (1954) observations
in a temperate latitude (300 0. The second part describes observations
of lower accuracy at a number of frequencies (7 Mc/s., 5.6 Mc/s., 2.0 Mc/s.
and 450 Kc/s.), using a terminated "long wire" aerial.

Item Type: Thesis - Unspecified
Authors/Creators:Dowden, R. L
Keywords: Atmospheric temperature, Ionosphere
Copyright Holders: The Author
Copyright Information:

Copyright 1958 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (M.Sc.)--University of Tasmania, 1959. Includes bibliographical references

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