Labels:bulletin board | reckoner | sky | stairs OCR: aurora boreal is: Celestial phenomens linked ta ionization af the upper atmosphere also called the northerm lights These polar lights seem ta erupt when the ionosphere is bombarded either by positively charged protons orby nega tively charged electrons The electricity that is ad duced causes rarefied gases ir the upper atmosphere glow red and green In the 1860s, Camille Flammarion postulated causal l relationships among fluctuations : in the earth' gravita tional field solar flares and aberrant humar heha northern atively amon
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