• The black aurora is a strange electrical phenomenon that generates a kind of 'anti-aurora'.

• Black auroras represent holes in the ionosphere

• It is the opposite of which creates visible auroras seen

Black Auroras

Does an Aurora Make Sound?

• Scientific instruments have not yet succeeded in recording this phenomenon.

• It is not likely that the sound can reach us from a height of 100 km, but we know that the northern lights are associated with a power full electric field which can be recorded at ground level.

• Different colors occur when the sun’s particles collide with oxygen at different levels of altitude in the atmosphere.

• Red occurs around 300km

• Green occurs around 100km

• White occurs when intensity of the light is weak

• Even lower in the atmosphere can produce blue and reddish-violet streaks when the collision occurs with nitrogen

Different Colors…

Environmental Effects:

•Magnetic storms can cause blackouts or irregularities in power supply along eastern Canada and the northeastern United States.

•The noise produced can be bothersome to people living near the auroras.

•May be associated with increased climate temperatures

Aurora on Other Planets

• Aurora NOT unique to Earth• Neptune, Jupiter, Uranus, Saturn,

Venus and even Mars all have had documented magnetic disturbances

• Jupiter has the most intense auroras• Cultural significance to the auroras

Sources…• http://www.exploratorium.edu/learning_studio/auroras/media/fuv_movie.mpeg• http://www.exploratorium.edu/learning_studio/auroras/seethem.html• http://www.visitnorway.com/en/Articles/Theme/What-to-do/Attractions/Nature/Let-there-be-northern-lights/• http://www.phys.ucalgary.ca/~trondsen/pai/BlackAurora/blackfeatures.html• http://www.esa.int/SPECIALS/Cluster/ESAF2OZ84UC_1.html• www.allthesky.com• http://manwiththemuckrake.blogspot.com/2009_05_24_archive.html• http://www.sharenator.com/Northern_lights/#/Northern_lights-4.html• http://www.flickr.com/photos/11304375@N07/2249104485/• http://www.trustedlog.com/2007/06/25/northern-lights-aurora/• http://www.designer-daily.com/northern-lights-by-norio-matsumoto-756• http://www.flickr.com/groups/top20aurora/• http://www.exploratorium.edu/learning_studio/auroras/fromspace.html• http://pictzz.blogspot.com/2009/02/aurora-borealis-in-canada-part-1.html• http://www.cogwriter.com/news/prophecy/solar-flares-expected/• http://dotconnectoruk.blogspot.com/2011/02/solar-flare-eruptions-set-to-reach.html• http://helios.gsfc.nasa.gov/gloss_st.html• http://www.nightskyobserver.com/jupiter/big-auroras-on-jupiter/• http://www.flickr.com/photos/11304375@N07/2045648290/• http://gagefaulkner.com/wordpress/• http://siamanswer.com/media/?search=left• http://hubpages.com/hub/Our-Turbulent-Sun-Part-2• http://www.myspace.com/arno_nymikuss• http://wattsupwiththat.com/2010/09/29/aurora-borealis-hits-a-100-year-low-point-sun-blamed/• http://www.care2.com/news/member/971826095/2725943• http://www.showiphonewallpapers.com/iphonewallpaperslist_9363.htm• http://connect.in.com/lights-over-norway/photos-1-1-1-9a00653695f65d79de803e2c4cb5231c.html