ELF propagation parameters for uniform models of the Earth-ionosphere waveguide

Details ELF propagation parameters for uniform models of the Earth-ionosphere waveguide ELF propagation parameters for uniform models of the Earth-ionosphere waveguide

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jastp..64.1989m&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 64, Issue 18, p. 1989-2001.

Physics

32

Scientific paper

Uniform models for the Earth-ionosphere cavity are considered with particular attention to the physical properties of the ionosphere for the extremely low frequency (ELF) range. Two consistent features have long been recognized for the range: the presence of two distinct altitude layers of maximum energy dissipation within the lower ionosphere, and a ``knee''-like change in the vertical conductivity profile representing a transition in dominance from ion-dominated to electron-dominated conductivity. A simplified two-exponential version of the technique widely used in ELF work identifies two slopes in the conductivity profile and, providing accurate results in the ELF communication band (45-75Hz), simulates too flat a frequency dependence of the quality factor within the Schumann resonance frequency range (5-40Hz). The problem is traced to the upward migration, with frequency increasing, of the lower dissipation layer through the ``knee'' region resulting in a pronounced decrease of the effective scale height for conductivity. To overcome this shortcoming of the two-exponential approximation and still retain valuable model analyticity, a more general approach (but still based on the Greifinger and Greifinger formalism) is presented in the form of a ``knee'' model whose predictions for the modal frequencies, the wave phase velocities and the quality factors reasonably represent observations in the Schumann resonance frequency range.

Affiliated with

Also associated with

No associations

Rating

ELF propagation parameters for uniform models of the Earth-ionosphere waveguide 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 ELF propagation parameters for uniform models of the Earth-ionosphere waveguide, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ELF propagation parameters for uniform models of the Earth-ionosphere waveguide will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-967268