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Did you know? Here’s a space weather and radio propagation educational tidbit – from http://SunSpotWatch.com – at 14:00 UTC on 2017-04-01:
Solar flares are rated in two different ways. The 1st method was used earlier this century; and is still in wide use today. This is done by measuring the flare’s brightness in the Hydrogen-Alpha spectrum, and measuring the size of flaring area.
A common solar flare rating system is composed of numerical digit+letter = measured optical size+brightness. All flare locations are given in heliographic longitude. On the Sun, the ‘heliographic’ longitude equals the distance of the flaring site from the rotational axis of the solar poles relative to the solar limbs.
And example flare: 'S20E90’ refers to '20 degrees south of solar rotational equator’, and directly on the eastern limb (90 degrees, east). A solar location of 'N40W00’ refers to '40 degrees north of the equator’, exactly on the Sun’s central meridian.
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