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noun, Astronomy.
the sum of all variable and short-lived disturbances on the sun, as sunspots, prominences, and solar flares.


Read Also:

  • Solar-apex

    noun, Astronomy. 1. the point on the celestial sphere, near Vega, toward which the solar system is moving relative to the visible stars. noun 1. another name for apex (sense 4)

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    noun 1. an array of solar cells, used as a source of electrical power.

  • Solar-chariot

    noun 1. (in ancient Egypt) a chariot placed in the tomb of a king to transport him to the sun.

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