Abstract. The impact of the
high-power modulated short-wave (SW) radiation of ground transmitters on the
parameters of the near-Earth cosmic plasma (Earth magnetosphere) is currently studied
extensively. It is expected that this impact and its consequences may be
closely associated with such process as local climate changes and the stability
of radiation belts of the Earth. Hence, remote radio physical measurements of
the parameters of induced perturbations of the Earth ionosphere are highly
relevant. It is well known that the impact of the high-power modulated SW
radiation from the transmitter of the HAARP (Alaska) station on the auroral
ring current in the lower ionosphere are studied extensively. A natural
assumption was made that a similar low frequency (LF) wave’s demodulation may
be produced by high-power transmitters of low-latitude equatorial heating
facilities in the regions of the lightning-perturbed lower ionosphere penetrated
by the equatorial ring current. Thus, the perturbed region of the ionosphere
acts as a demodulator and, correspondingly, as a radiating LF antenna. The aim
of this study is to construct a simple model of the low-latitude ionosphere,
which is suitable for calculation of ray trajectories of LF waves, based on
literature data. This model has been used to calculate the distribution of
demodulated LF waves. We compare a traditional scheme of LF wave’s measurement,
when a receiver is onboard of low height orbiting satellite, with a case when
such a receiver moves in vertical direction near the equatorial plane. It is
shown that the last scheme of measurements is essentially more effective.
Key words: low-latitude ionosphere,
equatorial anomaly of electron concentration, ionosphere disturbance by
intensive modulated short-wave emission.
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For citation:
A. V. Moshkov, V. N. Pozhidaev.
Modelling of on-board
measurements in the case of demodulated low frequency field in the low-altitude ionosphere.
Zhurnal Radioelektroniki - Journal of Radio Electronics,
2017, No. 11. Available at
http://jre.cplire.ru/jre/nov17/1/text.pdf.
(In Russian)