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Agfa Anzahl April Askim atmosphere Auriga Aurora Bands aurora forms Aurora on January band base line Bjerknes Bjorkdal Carl Stormer cloudlike aurora color December diffuse diffuse arc Divided Rays earth's shadow Fällen feeble Feuchte Figures flaming aurora geographical situation Gleichung Häufigkeit height measurements Hesselberg Hokksund Holmestrand homogeneous arc horizon Isolated Pulsating Arcs January 25th—26th January 3rd January 7th—8th Kongsberg Kurve Leiv Harang Lillehammer long base line Longitude lower border Luftdruck March Maxwellschen Mittelwert night Norvege November observed Orion Oscarsborg Oslo photographs pictures on Plate pulsating arc pulsating aurora pulsating patches pulsating surfaces ray structure red arc red aurora red patches red rays red spot remarkable seen on Fig seen on Plate shadow line simultaneously sketches are seen Southern Norway spectra Streuung sunlit rays Sverre Petterssen Tabelle Table taken Text Textflguren Tomte Trondheim Vegard Verteilung Verteilungskurve Werte yellow green zenith