E-Skip: Difference between revisions
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* in association with auroras in Polar regions | * in association with auroras in Polar regions | ||
* at frequencies up to about 150MHz | * at frequencies up to about 150MHz | ||
* can provide communication over distances up to 2,400Km | |||
Revision as of 01:15, 13 August 2008
Related wiki pages : Propagation, Meteor scatter, Aurora, Tropspheric ducting
What is it?
The E-layer is the lowest layer of the atmosphere and can typically be found at altitudes between about 80km and 100km. the E-Layer is characterised by high electron densities, and high temperatures (between 300K and 122K)
E-Skip propogation is the refelection of radio waves off the E-Layer, allowing reception many thousands of kilometres distant from normal reception areas.
At which frequencies does E-Skip occur?
E-Skip generally occurs at night in the medium and shortwave HF parts of the spectrum.
What is Sporadic E-Skip?
Sporadic E-skip is associated with scattered regions of especially dense ionisation that occur seasonall within the E-layer. generally it occurs:
- daily during the day in equatorial regions
- commonly in temperate regions in late spring, early summer and sometimes in early winter
- in association with auroras in Polar regions
- at frequencies up to about 150MHz
- can provide communication over distances up to 2,400Km