NORTHERN LIGHTS LIINA VIROLAINEN 12A CLASS KEILA KOOL NORTHERN LIGHTS Northern lights is a common name for the Aurora Borealis in the Northern Hemisphere. Where can we see the northern lights? The Northern Lights, as the name suggests, are especially related to the polar regions. They occur most frequently in a belt of radius 2500 km centered on the magnetic north pole. This so-called auroral zone extends over northern Scandinavia, Island, the southern tip of Greenland and continuing over northern Canada, Alaska and along the northern coast of Siberia. How often can you see the Northern Lights? In Troms and Finnmark, we can see the Northern Lights every other clear night, if not even more frequently. From southern Norway, only a few times a month while in central Europe hardly more than a few times a year and they have even been seen from
color • neon lights: helium – pink/white neon - red/orange argon - lavender krypton - gray/green The colors of auroras • Determined by gases in the Earth’s atmosphere • Solar particles collide with different gases • Oxygen (300km) – a rare red aurora • Oxygen (100-300km) – yellow-to-green aurora Do the Northern Lights emit sound? • Subject of discussion • Proven that people can hear natural auroral sounds • Energetic particles produce strange „clapping“ noise • Do not occur every northern lights outburst • Usually brief and faint • https://www.youtube.com/watch?v=eHvdZdsIZxg Conclusion • How the Northern Lights appear • Why the Northern Lights have different colors • About the sound they emit Thank you for your attention! sources • http:// www.athropolis.com/arctic-facts/fact- nlights-color.htm • http:// www.space
STRESS Structural Engineering System Solver (Programming Language) STRUDL Structural Design Language (Programming Language) STScI Space Telescope Science Institute STT Secure Transaction Technology [Microsoft] STX Start of Text .STY Style (file name extension) [Ventura, Word, WordPerfect] SUB Subroutine + Substitute + Subtract SUN Sun Microsystems, Inc. .SUP Supplemental Dictionary (file name extension) [WordPerfect] SUPERDARN Super Dual Auroral Radar Network [JHUAPL] SVC Switched Virtual Circuit SVCD Super Video Compact Disk SVF Simple Vector Format SVG Scalable Vector Graphics SVGA Super Video Graphics Array S-VHS Super VHS S-VIDEO Separate Video SVM System Virtual Machine [Microsoft] + System Volume Mangement SVN Switched Virtual Network [IBM] SVR Server SVR# System V Release Number [AT&T] SVTC Secure Videoteleconference S/W Software
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