Dance of the Spirits-aurora borealis-Northern Light…shared….

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Dear Readers,

(Please click onred linksbelow)

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Dear Friends & Readers,

Allow me to share one of my long time wishes/dreams:   to be able to visit sites where the Aurora Borealis (alias Northern Light) may be observed.  I want to be in the presence of nature’s magnificent energy and brilliance, such mystery of dancing particles from the solar wind…. .there is no better way to describe its beauty than to show you this incredible, real time footage of the Northern Lights, Aurora Borealis filmed on Jan. 24, 2012, during the peak of a Solar Storm. Please watch carefully how the Northern Lights dance across the sky. The photographer even captured a shooting star!


I simply cannot have enough of it, so here are some more links for your viewing pleasure:

http://www.youtube.com/watch?v=sBWPCvdv8Bk

http://www.youtube.com/watch?v=YJBrMXSn-hU

http://www.youtube.com/watch?v=MfPXLfkmQss&feature=related

http://www.youtube.com/watch?NR=1&feature=fvwp&v=uRedxU_cIS4

If any of you is curious about  Aurora Borealis, let’s take a quick overview at what Wikipedia has to offer, below:

“Aurora Borealis” and “Aurora Australis” redirect here. For other uses, see Aurora Borealis (disambiguation) and Aurora Australis (disambiguation).
Pictures of the aurora australis 

Images of the aurora australis and aurora borealis from around the world, including those with rarer blue and red lights

Picture of the aurora australis 

Aurora australis 1994 from Bluff, New Zealand

Picture of the aurora 

Aurora borealis 2012 from Kiruna, Sweden

An aurora (plural: aurorae or auroras) is a natural light display in the sky particularly in the high latitude (Arctic and Antarctic) regions, caused by the collision of energetic charged particles with atoms in the high altitude atmosphere (thermosphere). The charged particles originate in themagnetosphere and solar wind and, on Earth, are directed by the Earth’s magnetic field into the atmosphere. Aurora is classified as diffuse or discrete aurora. Most aurorae occur in a band known as the auroral zone which is typically 3° to 6° in latitudinal extent and at all local times or longitudes. The auroral zone is typically 10° to 20° from the magnetic pole defined by the axis of the Earth’s magnetic dipole. During a geomagnetic storm, the auroral zone will expand to lower latitudes. The diffuse aurora is a featureless glow in the sky which may not be visible to the naked eye even on a dark night and defines the extent of the auroral zone. The discrete aurora are sharply defined features within the diffuse aurora which vary in brightness from just barely visible to the naked eye to bright enough to read a newspaper at night. Discrete aurorae are usually observed only in thenight sky because they are not as bright as the sunlit sky. Aurorae occur occasionally poleward of the auroral zone as diffuse patches or arcs (polar cap arcs) which are generally invisible to the naked eye.

In northern latitudes, the effect is known as the aurora borealis (or the northern lights), named after the Roman goddess of dawn, Aurora, and the Greek name for the north wind, Boreas, by Pierre Gassendi in 1621. Auroras seen near the magnetic pole may be high overhead, but from farther away, they illuminate the northern horizon as a greenish glow or sometimes a faint red, as if the Sun were rising from an unusual direction. Discrete aurorae often display magnetic field lines or curtain-like structures, and can change within seconds or glow unchanging for hours, most often in fluorescent green. The aurora borealis most often occurs near the equinoctes. The northern lights have had a number of names throughout history. The Cree call this phenomenon the “Dance of the Spirits“. In Europe, in the Middle Ages, the auroras were commonly believed a sign from God.

Its southern counterpart, the aurora australis (or the southern lights), has almost identical features to the aurora borealis and changes simultaneously with changes in the northern auroral zone  and is visible from high southern latitudes in Antarctica, South America, New Zealand andAustralia.

Aurorae occur on other planets. Similar to the Earth’s aurora, they are visible close to the planet’s magnetic poles.

Modern style guides recommend that the names of meteorological phenomena, such as aurora borealis, be uncapitalized

Auroras result from emissions of photons in the Earth’s upper atmosphere, above 80 km (50 mi), 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 and magnetospheric particles being funneled down and accelerated along the Earth’s magnetic field lines; excitation energy is lost by the emission of a photon, or by collision with another atom or molecule:

oxygen emissions
Green or brownish-red, depending on the amount of energy absorbed.
nitrogen emissions
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.

Oxygen is unusual in terms of its return to ground state: it can take three quarters of a second to emit green light and up to two minutes to emit red. Collisions with other atoms or molecules will absorb the excitation energy and prevent emission. Because the very top of the atmosphere has a higher percentage of oxygen and is sparsely distributed such collisions are rare enough to allow time for oxygen to emit red. Collisions become more frequent progressing down into the atmosphere, so that red emissions do not have time to happen, and eventually even green light emissions are prevented.

This is why there is a color differential with altitude; at high altitude oxygen red dominates, then oxygen green and nitrogen blue/red, then finally nitrogen blue/red when collisions prevent oxygen from emitting anything. Green is the most common of all auroras. Behind it is pink, a mixture of light green and red, followed by pure red, yellow (a mixture of red and green), and lastly pure blue.

Auroras are associated with the solar wind, a flow of ions continuously flowing outward from the Sun. The Earth’s magnetic field traps these particles, many of which travel toward the poles where they are accelerated toward Earth. Collisions between these ions and atmospheric atoms and molecules cause energy releases in the form of auroras appearing in large circles around the poles. Auroras are more frequent and brighter during the intense phase of the solar cycle when coronal mass ejections increase the intensity of the solar wind.

~have a bright and sunny day~

Gathered, written, and posted by sunisthefuture-Susan Sun Nunamaker

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2 Responses to “Dance of the Spirits-aurora borealis-Northern Light…shared….”

  1. Franziska Says:

    Hi, interessanter Artikel, stand genau das drin was ich gesucht hatte. Mach weiter so! Gruß

  2. scellier primonial Says:

    I get pleasure from going to every day to find out your writings. I have your page bookmarked on my must go through list!

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