Aurora Borealis <br />Made by Riquette Mory<br />01<br />
A u r o r a s<br />Auroras are called also northern and southern (polar) lights or Aurora.<br />Auroras are observed at ni...
A u r o r a s<br />Auroras are the result of the emissions of photons in the Earth&apos;s upperatmosphere:<br />oxygenemis...
A u r o r a s<br />Northern Lights<br />Southern Lights<br />A predominantly red aurora australis<br />03<br /> Aurora<br ...
A u r o r a s<br />Auroras are formed When a &quot;solar wind&quot; of charged particles from the Sun enters Earth&apos;s ...
November 24, 2009<br />6<br />Aurora Borealis                                       Riquette Mory<br />A u r o r a s<br />...
November 24, 2009<br />7<br />Aurora Borealis                                       Riquette Mory<br />A u r o r a s<br />...
On Oct. 30th, the interplanetary magnetic field (IMF) near <br />Earth tilted south, an orientation that weakens our plane...
A u r o r a s<br />The deepest solar minimum in nearly  100 years has not put a <br />stop to Northern Lights around the A...
Frequency of Occurrence<br />November 24, 2009<br />10<br />Aurora Borealis                                       Riquette...
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Aurora Borealis

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Auroras - Borealis (north) & Australis (south)

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Aurora Borealis

  1. 1. Aurora Borealis <br />Made by Riquette Mory<br />01<br />
  2. 2. A u r o r a s<br />Auroras are called also northern and southern (polar) lights or Aurora.<br />Auroras are observed at night in the polar regions.<br />Auroras are called after the Greek goddess of dawn Aurora.<br />Auroras are most visible closer to the poles due to the longer periods of darkness and the magnetic field.<br />The aurora australis (Latin word for “of the south”) the southern polar lights are the counterpart of the northern lights. They are visible only from high southern latitudes in Antarctica andSouth America.<br />02<br />November 24, 2009<br />2<br />Aurora Borealis Riquette Mory<br />
  3. 3. A u r o r a s<br />Auroras are the result of the emissions of photons in the Earth&apos;s upperatmosphere:<br />oxygenemissions <br />Green or brownish-red, depending on the amount of energy absorbed. <br />Nitrogenemissions <br />Blue or red. Blue if the atom regains an electron after it has been ionized. Red if returning to ground state from an excited state. <br />November 24, 2009<br />3<br />Aurora Borealis Riquette Mory<br />
  4. 4. A u r o r a s<br />Northern Lights<br />Southern Lights<br />A predominantly red aurora australis<br />03<br /> Aurora<br />Borealis<br /> Aurora australis 1994 <br />from Bluff, New Zealand<br />Aurora australis (September 11, 2005) <br />as captured by NASA&apos;s IMAGE satellite<br />November 24, 2009<br />4<br />Aurora Borealis Riquette Mory<br />
  5. 5. A u r o r a s<br />Auroras are formed When a &quot;solar wind&quot; of charged particles from the Sun enters Earth&apos;s magnetic field, accelerating electrically charged particles trapped within. The high-speed particles then crash into Earth&apos;s upper atmosphere over the Polar Regions, causing the atmosphere to emit a ghostly, multicolored glow. <br />04<br />November 24, 2009<br />5<br />Aurora Borealis Riquette Mory<br />
  6. 6. November 24, 2009<br />6<br />Aurora Borealis Riquette Mory<br />A u r o r a s<br />Forms and magnetism<br />Typically the aurora appears either as a diffuse glow or as &quot;curtains&quot; that approximately extend in the east-west direction. Some times, they form &quot;quiet arcs&quot;; or sometimes (&quot;active aurora&quot;),<br />“Each curtain consists of many parallel rays, each lined up with the local direction of the magnetic field lines, suggesting that aurora is shaped by Earth&apos;s magnetic field. Indeed, satellites show electrons to be guided by magnetic field lines, spiraling around them while moving towards Earth.”<br />Northern lights over Calgary<br />
  7. 7. November 24, 2009<br />7<br />Aurora Borealis Riquette Mory<br />A u r o r a s<br />On other planets<br />“Jupiter aurora. The bright spot at far left is the end of field line to Io; spots at bottom lead to Ganymede and Europa.”<br />“Both Jupiter and Saturn have magnetic fields much stronger than Earth&apos;s (Jupiter&apos;s equatorial field strength <br />is 4.3 gauss, compared to 0.3 gauss for Earth), and both have large radiation belts.” <br />Aurora has been observed on Jupiter and Saturn, Uranus and Neptune, most clearly with the Hubble Space Telescope.<br />
  8. 8. On Oct. 30th, the interplanetary magnetic field (IMF) near <br />Earth tilted south, an orientation that weakens our planet&apos;s <br />magnetic defenses against solar wind. Solar wind poured into <br />Earth&apos;s magnetosphere and sparked an early Halloween display of <br />Northern Lights over Alaska.<br />November 24, 2009<br />Aurora Borealis Riquette Mory<br />8<br />A u r o r a s<br />Niels Giroud, Nordland, Norway <br />Oct. 24, 2009<br />Wioleta Zarzycka, IcelandOct. 25, 2009<br />Michael H Davies, Canada Oct. 27, 2009<br />
  9. 9. A u r o r a s<br />The deepest solar minimum in nearly 100 years has not put a <br />stop to Northern Lights around the Arctic Circle. <br />The geomagnetic field has been quite active this month (Nov. 09),<br />Producingdisplays of particular beauty over Scandinavia.<br />November 24, 2009<br />9<br />Aurora Borealis Riquette Mory<br />Tom Roland, NorwayNov. 10, 2009<br />John, Fairbanks, AlaskaNov. 8, 2009<br />Babak Tafreshi, NorwayNov. 7, 2009<br />
  10. 10. Frequency of Occurrence<br />November 24, 2009<br />10<br />Aurora Borealis Riquette Mory<br />Geomagnetic storms that ignite auroras actually happen more often during the months around the equinoxes.<br />It is known that during spring and autumn, the interplanetary magnetic field and that of Earth link up.<br />I hope that you enjoyed the Aurora Borealis Beauty<br />

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