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Message Subject SOLAR WATCH * M2.4 Solar Flare July 14 2017! Earth directed CME (Updated Daily)
Poster Handle Spittin'Cesium
Post Content
I thought maybe it would be a good idea to outlay what it is the VHF Riometer measures and how so I have snipped a little for the lurkers -

Snipped -

'What is a riometer?
A riometer is a passive scientific instrument used to observe ionospheric absorption, particularly absorption at altitudes less than 110 km caused by electron precipitation. The word riometer stands for Relative Ionospheric Opacity Meter'.

'How does a Riometer Work?
Riometers measure the strength of radio noise originating from stars or galaxies and arriving at the earth after passing through the ionosphere - The sky is filled with stars and galaxies that emit a broad spectrum of radio noise and the noise is strong enough to be picked up using sensitive receiving equipment,this noise varies on a predictable basis as the Earth rotates.

Depending on the amount of ionization present, radio signals passing through the ionosphere may suffer losses (or become weaker) in a process called absorption. Imagine the ionosphere as a set of louvers. If it is disturbed, the louvers close and signals arriving from outside of the earth's vicinity do not pass through very well. If the ionosphere is "quiet," the louvers are open fully and signals pass through easily,if there were no sources of absorption in the earth's atmosphere, the cosmic noise measured by the riometer would be exactly the same at corresponding times during each successive Sidereal day. The "Quiet Day Curve" is this expected, or "no-absorption" diurnal noise level. (In this context,"quiet" means that the ionosphere is undisturbed by solar events.) Any difference between the actual measurement and the Quiet Day Curve is attributed to ionospheric absorption

Read more here if you want [link to www.haarp.alaska.edu] .
 Quoting: Spittin'Cesium

lurker says thanks !
 Quoting: AC 5341

No problem : )

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