Cone structure and focusing of VLF and LF electromagnetic waves at high altitudes in the ionosphere

Details Cone structure and focusing of VLF and LF electromagnetic waves at high altitudes in the ionosphere Cone structure and focusing of VLF and LF electromagnetic waves at high altitudes in the ionosphere

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99..389a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A1, p, 389-399

Physics

1

Earth Ionosphere, Electric Dipoles, Electric Fields, Electromagnetic Radiation, Very Low Frequencies, Altitude, Geomagnetism, Magnetic Fields, Resonant Frequencies, Space Plasmas

Scientific paper

The frequency and angle dependencies of the electric field radiated by an electric dipole E = E(sub 0) cos omega(t) are studied through numerical calculations of absolute value of E in the VLF and LF frequency bands where F is less than or equal 0.02 to 0.05 f(sub b) in a model ionosphere over an altitude region of 800-6000 km where the wave frequency and electron gyrofrequency varies between F approximately 4-500 kHz and f(sub b) is approximately equal (1.1 to 0.2) MHz respectively. It is found that the amplitudes of the electric field have large maxima in four regions: close to the direction of the Earth magnetic field line B(sub 0) (it is called the axis field E(sub 0), in the Storey E(sub St), reversed Storey E(sub RevSt), and resonance E(sub Res) cones. The maximal values of E(sub 0), E(sub Res), and E(sub RevSt) are the most pronounced close to the lower hybrid frequency, F approximately F(sub L). The flux of the electric field is concentrated in very narrow regions, with the apex angles of the cones Delta-B is approximately (0.1-1) deg. The enhancement and focusing of the electric field increases with altitude starting at Z greater than 800 km. At Z greater than or equal to 1000 up to 6000 km, the relative value of absolute value of E, in comparison with its value at Z = 800 km is about (10(exp 2) to 10(exp 4)) times larger. Thus the flux of VLF and LF electromagnetic waves generated at high altitudes in the Earth's ionosphere are trapped into very narrow conical beams similar to laser beams.

Affiliated with

Also associated with

No associations

Rating

Cone structure and focusing of VLF and LF electromagnetic waves at high altitudes in the ionosphere does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Cone structure and focusing of VLF and LF electromagnetic waves at high altitudes in the ionosphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cone structure and focusing of VLF and LF electromagnetic waves at high altitudes in the ionosphere will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-870097