The height dependence of the field of the surface electromagnetic wave over the ice sea radio path at a frequency of 500 kHz

 

Yu. B. Bashkuev, M. G. Dembelov

Institute of physical material sciences of SB of RAS, Skhyanovoy 6, Ulan-Ude 670047, Russia

 

The paper is received on November 18, 2016, after correction - on December 27, 2016

 

Abstract. It is shown that conditions of propagation of surface electromagnetic waves (SEW) over the ice-covered sea at receiving altitudes up to 10 km are always more favorable than over the open sea. This fact is based on the comparison of height dependencies of the module of an attenuation function |W| and the intensity of the field E at a frequency of 500 kHz for "ice-sea" and "sea" radio paths with a length of up to 1000 km. The analysis of numerical results for the module of an attenuation function |W| and the intensity of the field E showed that conditions of propagation of SEW over the ice paths depend on the height of the reception. The SEW field excited by a vertical electric dipole over a layered structure of the "ice-sea" that has a highly inductive surface impedance is significantly higher than the waves over the open sea. At a frequency of 500 kHz the module of an attenuation function |W| over the ice path distance of 1000 km almost always exceeds |W| over a homogeneous sea surface. It decreases with increasing height of receiving. For |W| over the sea by increasing the height of the reception is increased. The intensity field over the ice path at over 1000 km is always higher than intensity field over homogeneous sea surface. It decreases with increasing height of receiving. This effect is due to "adhesion" of the SEW to highly-inductive interface of mediums. Field intension increases slightly above the sea by increasing the height of the reception. The numerical results can be used to select the optimal operating frequency of LF-MF radio lines of long and medium range and to estimate the effectiveness of channels of communication and navigation in the Arctic ocean. Note, that the SEW at a frequency of 500 kHz exists to greater heights of reception. It is practically important in the organization of radio communication and navigation, for example, between the drifting polar stations and aircrafts (planes and helicopters), as well as for Transpolar air routes. It is necessary to continue the numerical modeling of the height dependence of SEW for different frequencies, thicknesses of ice and the distance to the transmitter. Further research must also be associated with the extension of the frequency range of modeling in the microwave range.

Keywords: surface electromagnetic waves (SEW), «ice-sea» structure, surface impedance, an attenuation function, field intensity, sea ice, impedance path.

References

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For citation:

Yu. B. Bashkuev, M. G. Dembelov. The height dependence of the field of the surface electromagnetic wave over the ice sea radio path at a frequency of 500 kHz. Zhurnal Radioelektroniki - Journal of Radio Electronics, 2017, No. 3. Available at http://jre.cplire.ru/jre/mar17/4/text.pdf. (In Russian)