Did you know? Here’s a space weather and radio...

Did you know? Here’s a space weather and radio propagation educational tidbit – from http://SunSpotWatch.com – at 14:00 UTC on 2017-08-05:

The Sun’s visible outer layer is the ‘photophere’ which has a temperature of about 5800 degrees Kelvin. Above the photosphere lies the chromosphere or lower solar atmosphere. The corona forms the outer atmosphere of the Sun, above the photosphere.

About 99.9 percent of the Sun is composed of helium (~7.9%) and hydrogen (~92.1%). Above photosphere, at approximately 5000 km in altitude, temperature falls to about 4200 K. Above photosphere, at greater than the 5000 km altitudes, the Sun’s temperature increases to approximately one (1) to three (3) million Kelvin, in that corona.

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