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Show Aurora Borealls Borea1is Borealis Varies ; White , Green , Red , PurpleThe Purple PurpleThe The intrepid English Enghsh and Dutch Dutchsa Dutchsailors Dutchsailors sa sailors ors who searched for the north north- northwest northwest northwest - west passage , a supposed water waterroute waterroute waterroute route around the northern end of ofNorth ofNorth ofNorth North America , , failed in their mam main mamobJective mainobjective mamobjective obJective , , but nevertheless neverthelcss supphed supplied supphedscientIfic suppliedscientific suppliedscientific scientIfic men with a wealth of me- me meteorologIcal meteorological me meteorological - teorological information mormatlon ! The one onephenomenon onephenomenon onephenomenon phenomenon that mot mqst most ) Impressed Impressedthem impressedthem impressedthem them , and one that has come to be beregarded beregarded beregarded regarded as tvpical typical of northern lati- lati latitudes lati lath latitudes - . tudes , . is the aurora borcalis boreahs borealis or ornorthern ornorthern ornorthern northern lights , , observes a VlI'ltcr VlIltcr writer VlI'ltcrin writerin v/ritcrin v ritcrin / ' in the Chicago TrIbuneThis Tribune TribuneThis TribuneThis This is an unearthly display of l1ght light l1ghtthat lightthat lightthat that appears in the sky at night nightIt nightIt nightIt It may be seen as tar far south as the thenorthern thenorthern thenorthern northern part of the United Umted States StatesIn StatesIn StatesIn In the eastern hemisphere how how- however however however - ever , it is rarely rarcly seen farther farlht.r farlhtr farthLr . south souththan souththan souththan than the northern parts of Norway NorwaySweden . , Sweden and Russia It usually usuaIly ap appears appears appears pears as one of several distinct pat pat- patterns patterns patterns - - terns of light llght It may be . an .m m arch archthe , , the lower side of ofhich \\hich hich Trhich \ \ hlch is sharply sharplydefmed sharplydefined sharplydefined defmed defined with WJth the upper gradually graduallyfading graduallyfading graduallyfading fading into darkness , . or the lower edge , instead of being bemg arched , may maybe maybe maybe be curved in m irregular folds like the theedge theedge theedge edge of a draped curtain curtam Some Some- SometImes Sometunes Sometimes - times tunes it takes the form of radiant radiantbeams radiantbeams radiantbeams beams which may seem to spIral spIralupward spiralupward spiralupward upward toward an infinite point at atthe atthe atthe the zemthIn zenithIn zenith zemth zenithIn In color the aurora varies vanes from frompearly frompearly frompearly pearly white to a pale green , al- al although although al although - - though it has on occasion shown shownshades shownshades shownshades shades of red or purple It may be beeasIly beeasily beeasily easIly the brightest object in the thenocturnal thenocturnal thenocturnal nocturnal sky , or it may mny be barely barelyvisIble barelyvisible barelyvisible visIble It may last for only a few fewminutes fewminutes fewminutes minutes or for many hours |