Thursday, February 11, 2010

Aurora..Cahaya yang Menakjubkan...

Auroras are the result of the emissions of photons in the Earth's upper atmosphere, above 80 km (50 miles), from ionized nitrogen atoms regaining an electron, and oxygen and nitrogen atoms returning from an excited state to ground state. They are ionized or excited by the collision of solar wind particles being funneled down and accelerated along the Earth's magnetic field lines; excitation energy is lost by the emission of a photon of light, or by collision with another atom or molecule. Aurora hanya dapat dilihat di langit dan hanya boleh dilihat di latitud yang tinggi.Aurora terdapat di kawasan kutub spt:Alaska,Iceland,Kanada,Finland-kutub utara:Australia n Antartika-kutub selatan..Aurora blh dilihat dlm pelbagai warna spt hijau,ungu ,merah,biru hasil drpd pengionan melalui tenaga yang tinggi..Memang cantik...syangnye cahaya ni x de kat Malaysia...

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