Post on 07-Jul-2018
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EXPLANATION TEXT
WHY DO AURORASHAPPEN
Created by:Roaliyah XII Sciece !
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Aurora is an electro-static
phenomenon, characterised by abright glow and caused by thecollision of charged particles in themagnetosphere with atoms in the
Earth’s upper atmosphere.
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Ultimately, the source lies in the
solar wind, a fast-moving stream ofparticles constantly owing from theSun that carries the Sun’s magneticeld out into space. !he solar wind,typically moving at "#$ miles %&$$'ilometers( per second, ows pastEarth’s magnetic eld and molds it
into an elongated bubble or cavity,compressing its sunward side andstretching its night side far beyond
the )oon’s orbit.
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Under certain conditions, the solarwind’s magnetic eld can merge withEarth’s, creating electrical currents
that drive protons and electrons intothe polar atmosphere. *owerful
events occurring on the Sun can driveenormous changes in the solar wind,increasing both its speed and density
and enhancing its e+ect on Earth.
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An aurora is usually observed inthe night s'y, particularly in thepolar one. or this latter reason,
some scientists call it a polar
aurora/ %aurora polaris(.Aurora 0oloured light in the nights'y near the Earth’s magnetic
poles, called aurora borealis%northern lights( in the northernhemisphere and aurora australis
%southern lights( in the southern
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1orthern lights is the name of a light
phenomenon often seen in thenorthern regions. !he lights havebeen around since Earth formed anatmosphere !he scientic name forthe phenomenon is Aurora3orealis/, aurora for short.
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!he southern lights or aurora
australis, most commonly seen insouthern 1ew 4ealand. 5t shows atypical red and green aurora, the
nearly vertical rays tracing theearth’s magnetic eld lines.