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Answer for the clue "Part of the solar spectrum ", 8 letters:
rainband

Word definitions for rainband in dictionaries

Wikipedia Word definitions in Wikipedia
A rainband is a cloud and precipitation structure associated with an area of rainfall which is significantly elongated. Rainbands can be stratiform or convective , and are generated by differences in temperature. When noted on weather radar imagery, this ...

Wiktionary Word definitions in Wiktionary
n. A dark band in the yellow portion of the solar spectrum near the sodium line, caused by the presence of watery vapour in the atmosphere, and hence sometimes used in weather predictions.