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Author Topic: E-sporadic DXMAPS  (Read 2120 times)
KD7RDZI2
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Posts: 171




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« on: June 11, 2017, 08:32:09 AM »

How can the ES-sporadic MUF maps such as on https://www.dxmaps.com/spots/mapg.php be calculated? I can't understand how one might give a such precise MUF value for each locator squares as they do? Where the data come from? Actual QSOs, radars ... Huh
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W6RZ
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Posts: 134




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« Reply #1 on: June 16, 2017, 04:54:34 AM »

The Es MUF is an estimate based on the path length of reported contacts. It's done with a geometry calculation. See this link for details.

http://k9la.us/Elevation_Angles_Required_for_6m_Sporadic_E.pdf

For example, if path lengths of 700 km are being reported on 50 MHz, then the foEs is assumed to be 15.61 MHz. A 15.61 MHz foEs at 0 degrees elevation would support an MUF of 87.1 MHz (15.61 MHz multiplied by the 0 degree M-factor of 5.58).

foEs is the maximum frequency at which radio waves are being returned from directly overhead.
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