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SOLAR WEATHER  
Solar X-Rays

Geomagnetic Field

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Solar Flare Definition
A solar flare is a violent explosion in the Sun's atmosphere with an energy equivalent to tens of millions of hydrogen bombs. Solar flares take place in the solar corona and chromosphere, heating plasma to tens of millions of kelvins and accelerating the resulting electrons, protons and heavier ions to near the speed of light. They produce electromagnetic radiation across the electromagnetic spectrum at all wavelengths from long-wave radio to the shortest wavelength Gamma rays. Most flares occur around sunspots, where intense magnetic fields emerge from the Sun's surface into the corona. The energy efficiency associated with solar flares may take several hours or even days to build up, but most flares take only a matter of minutes to release their energy.

 

Geomagnetic activity refers to the natural variations in the earth's geomagnetic field, classified quantitatively into quiet, unsettled, active, and geomagnetic storm levels according to the observed  index:
quiet 0 - 7
unsettled 8 - 15
active 16 - 29
minor storm 30 - 49
major storm 50 - 99
severe storm 100 - 400

The geomagnetic field is dynamic and undergoes continual slow secular changes as well as short-term disturbances.

Copyright   Mick Dale