Of the white-light CORONA (that is, the corona seen by the eye at a
total solar eclipse), that portion which is caused by sunlight
scattered by electrons in the hot outer atmosphere of the sun.
A 3-hourly quasi-logarithmic local index of geomagnetic activity
relative to an assumed quiet-day curve for the recording site.
Range is from 0 to 9. The K index measures the deviation of the
most disturbed horizontal component.
A unit of absolute temperature.
A 3-hourly planetary geomagnetic index of activity generated in
Gottingen, Germany, based on the K INDEX from 12 or 13 stations
distributed around the world.