"Wavelength bands" refers to different ranges or groups of wavelengths or colors in a spectrum. It helps categorize and study different parts of the spectrum based on the length or frequency of the waves. Full definition
Using high - speed cameras to analyze a narrow wavelength band in the near - infrared region, the sensors search for changes in the tops of clouds, which indicate lightning strikes. (scientificamerican.com)
By comparing data from wavelengths bands in the spectrum, astronomers are gaining new knowledge of the universe. (scientificamerican.com)
As the radiation in that particular wavelength band is used up, the amount left for absorption by more of the gas is reduced. (realclimate.org)