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REPORT ABUSIVE REPLY
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Message Subject
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SOLAR WATCH * Huge X8.2 Flare Sept. 10, 2017! (Updated Daily)
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Poster Handle
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shadasonic |
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Post Content
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The relationship between the formation of temperate-zone sporadic-E and solar geophysical conditions are still debated. Most researchers have held that there is no clear correlation between the sunspot cycle and sporadic-E formation that compares with close association between F-layer and solar conditions. Some recent work has suggested that this may not be the case, and that low solar activity, whether measured as solar flux (sunspot number) or short term geomagnetic conditions (planetary A and K indexes), are most favourable for temperate-zone sporadic-E formation. [ link to www.uksmg.org] Unlike F-layer propagation, mid-latitude sporadic E does not appear to be correlated with the solar cycle. F-layer propagation at HF is caused by the presence of free electrons. In the E layer ions are also important, principally O+, O++, NO+, Fe+, Mg+. The ionisation is caused by solar radiation. [ link to www.mike-willis.com] The Critical F Layers gets a mention. That's some very handy,handy informtion! Need to pass this on to S0. hmm even more interesting Sporadic E layer (Es layer) is a thin layer (usually less than 1 mile thick) with limited horizontal extent (tens of miles) in the E-region having enhanced electron density similar to that of the F-region and hence causes reflection at lower altitude of radio waves normally reflected by the F-region. One source of sporadic E is the ionized trail of a meteor. Sporadic E layers also have differing characteristics and causes depending on latitude: [ link to www.albany.edu] Now I wonder is that a free electron in the E layer. This is very interesting, great info!
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