Home›Browse›spectral index🌐EnglishEnglishEspañolFrançaisItalianoNederlandsРусский한국어中文日本語EntityQ2280060· pop 9· linked from 54 articlesspectral indexSign in to savemeasure of the dependence of radiative flux density on frequency (astronomical term)Available in 9 languagesEspañolFrançais中文РусскийItalianoCatalanNederlandsUkrainianvia Wikidata sitelinks · CC0