Modifying the local ionosphere-magnetosphere relation by intense SW radio waves of mid-latitude «Sura» heating stand

Belov A.S.1, Markov G.A.1, Frolov V.L.1, Rapoport V.O.1, Parro M.2
  1. Nizhnegorodsky State University
  2. Environment Physics and Chemistry Laboratory, Orleans, France

The study of ionosphere-magnetosphere relation and the investigation how they are effected by ground-
based radio-technical means are the important problem of modern geophysics. Realization of such effect is
based on the possibility to form artificial wave channels by intense SW radio emission from the Earth’s surface;
these wave channels have considerable impact on the processes of excitation and propagation of low-frequency
electromagnetic wave in a disturbed magnetic field tube. The data, presented in the work, were obtained at
mid-latitude «Sura» heating stand during the experiment on May 12, 2008 late at night. Measurements of the
characteristics of electromagnetic and plasma disturbances at the heights of the topside ionosphere were carried
out by DEMETER satellite-borne equipment. When the satellite flew over the magnetic field tube rested upon
the region of intensive generation of artificial ionospheric turbulence, the following was observed: the formation
of artificial dactyls with electron density increase of about 40 percent, the considerable increase of electric field
intensity in the range up to 400-500 Hz and of magnetic fields in the range of 200 Hz (weaker one — up to
500 Hz), and the increase twice as much as the background level of the intensity of precipitating electron steam
with the energy 90-525 keV. Generation of electromagnetic radiation at such low frequencies in an artificial wave
channel as well as the increase of precipitating electron steam from radiation belts are the indication of maser
excitation in a channel modified local plasma tube of a magnetospheric resonator.