职称英语阅读翻译-北极光.doc

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1、职称英语阅读第十三篇TheNorthernLights北极光TheSunisstormyandhasitsownkindofweather．ItissohotandactivethateventheSun’sgravitycannotholditsatmosphereincheck1!EnergyflowsawayfromtheSuntowardtheEarthinastreamofelectrifiedparticlesthatmoveatspeedsaroundamillionmilesperhour2．Theseparticlesarecalledplas

2、ma，andthestreamofplasma3comingfromtheSuniscalledthesolarwind．ThemoreactivetheSun，thestrongerthesolarwind．ThesolarwindconstantlystreamstowardtheEarth，butdon’tworrybecauseaprotectivemagneticfieldsurroundsourplanet．Thesamemagneticfieldthatmakesyourcompasspointnorthalsosteerstheparticles

3、fromtheSuntothenorthandsouthpoles．ThechargedparticlesbecometrappedinmagneticbeltsaroundtheEarth．WhenalargeblastofsolarwindcrashesintotheEarth’smagneticfield，themagneticfieldfirstgetssqueezedandthenthemagneticfieldlinesbreakandreconnect．4Thebreakingandreconnectingofthemagneticfieldlin

4、escancauseatomicparticlescalledelectronstrappedinthebeltstofallintotheEarth’satmosphereatthepoles．AstheelectronsfalltotheEarth，theycollidewithgasmoleculesintheatmosphere，creatingflashesoflightinthesky．Eachatmosphericgasglowsadifferentcolor．Oxygenandnitrogenglowsredandgreenandnitrogen

5、glowsviolet-purple．Asthesevariouscolorsglowanddanceinthenightsky，theycreatetheNorthernLightsandtheSouthernLights．Watchingaurorasisfunandexciting，butnormallyyoucanonlyseetheminplacesfarnorthlikeAlaskaandCanada．Themovementoftheauroraacrosstheskyisusuallyslowenoughtoeasilyfollowwithyour

6、eyesbuttheycanalsopulsate，flicker，orevenmovelikewaves．Duringsolarmaximum，5aurorasareseenasfarsouthasFlorida，evenMexico!6Aurorasoftenseemtobeveryclosetotheground，butthelowestauroraisstillabout100kilometersabovetheground，adistancemuchhigherthancloudsareformedorairplanescanfly．Atypicala

7、urorabandcanbethousandsofkilometerslong，afewhundredkilometershigh，butonlyafewhundredmetersthick．WehopeyouareabletotraveltofarnorthplacesliketheArcticCircleandseetheNorthernLightsatleastonceduringyourlifetime．Weknowyouwillneverforgetit!太阳是暴躁的，有它自己的一种气象。这是那么热列和活跃，甚至太阳的引力无法控制它自己的的大气层！能源

8、从太阳向地球以带电粒子流