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W

WHITE LIGHT (WL)

Sunlight integrated over the visible portion of the spec- trum (4000 - 7000 angstroms) so that all colors are blended to appear white to the eye.

WHITE LIGHT FLARE

A major FLARE in which small parts become visible in white light. Such flares are usually strong X-ray, radio, and particle emitters.

WOLF NUMBER

An historic term for SUNSPOT NUMBER. In 1849, R. Wolf of Zurich originated the general procedure for computing the sunspot number.