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The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES

 
Anonymous Coward
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10/15/2010 11:33 AM
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The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
:nationaur:

Scientists have found the elusive trigger that sets off the most striking visual outbursts, known as pulsating aurorae or blinking lights around Earth's polar regions. (See aurorae pictures.)

Though typical auroras usually stretch more than 620 miles (a thousand kilometers), and last only minutes at a time, pulsating aurora are small glowing patches of light about a 62 miles (a hundred kilometers) wide that flash on and off every 5 to 40 seconds. This flickering gives the appearance of exploding lights in the sky.

"The driver behind auroral pulsation has been a long-standing question in the auroral physics community for more than four decades," said project leader Toshi Nishimura, a researcher at University of California, Los Angeles.

But Nishimura and colleagues discovered the driving force behind the unusual cosmic fireworks appears to be a particular type of electromagnetic wave that originates in Earth's protective, bubble-like magnetosphere.


When solar wind—a stream of charged particles released from the sun—strikes our planet's magnetic field, the wind gets funneled down into the atmosphere.

The charged particles collide with atmospheric molecules and sometimes form bursts of light known as chorus waves.

[link to news.nationalgeographic.com]
Anonymous Coward (OP)
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10/15/2010 11:37 AM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
AWESOME!!!


Anonymous Coward (OP)
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10/15/2010 11:39 AM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
Pulsating aurora, a spectacular emission that appears as blinking of the upper atmosphere in the polar regions, is known to be excited by modulated, downward-streaming electrons. Despite its distinctive feature, identifying the driver of the electron precipitation has been a long-standing problem. Using coordinated satellite and ground-based all-sky imager observations from the THEMIS mission, we provide direct evidence that a naturally occurring electromagnetic wave, lower-band chorus, can drive pulsating aurora. Because the waves at a given equatorial location in space correlate with a single pulsating auroral patch in the upper atmosphere, our findings can also be used to constrain magnetic field models with much higher accuracy than has previously been possible.
[link to www.sciencemag.org]
Air

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10/15/2010 11:40 AM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
Absolutely beautiful. I love your posts.

bump for beauty and information.
Anonymous Coward (OP)
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10/15/2010 11:40 AM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
Absolutely beautiful. I love your posts.

bump for beauty and information.
 Quoting: Air


Thank you, Air. That video of it is incredible...it is a beautiful universe.
Anonymous Coward
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10/15/2010 11:48 AM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
bump

Thank you for being you.
Anonymous Coward
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10/15/2010 11:49 AM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
Very cool!
Check this one out...sorry I don't know how to embed
[link to www.youtube.com]
Anonymous Coward (OP)
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10/15/2010 11:49 AM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
A new study has found a connection between pulsating aurora displays around Earth's North Pole and the intensity of so-called chorus waves, which are electromagnetic fluctuations that occur in space within our planet's magnetosphere.

Pulsating auroras typically occur in the night sky around the Earth's polar regions and are characterized as a group of luminous patches that blink on and off with recurrence periods of roughly five to 40 seconds, Nishimura explained.

They found that chorus waves in Earth's magnetosphere, which were simultaneously detected by one of the THEMIS satellites, were directly related to changes observed in the pulsating aurora.

"We found that when the intensity of chorus waves increases, the luminosity of the aurora also correspondingly increases," Nishimura said. "The timing of these modulations matched almost perfectly."

[link to www.sikunews.com]
Anonymous Coward (OP)
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10/15/2010 11:50 AM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
"It sounds like birds chirping when the signal is played through a speaker – that's why it is called 'chorus,'" Nishimura said. "Chorus has two frequency bands. The lower frequency band interacts with energetic electrons that have appropriate energies to cause aurora when precipitating toward the upper atmosphere."
[link to www.sikunews.com]
Anonymous Coward
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10/15/2010 11:51 AM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
Very cool!
Check this one out...sorry I don't know how to embed
[link to www.youtube.com]
 Quoting: Anonymous Coward 1075108

Gets really good at about 30 seconds
Anonymous Coward (OP)
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10/15/2010 11:54 AM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
Very cool!
Check this one out...sorry I don't know how to embed
[link to www.youtube.com]
 Quoting: Anonymous Coward 1075108


Its not a pulsating aurorae, but cool!

Anonymous Coward (OP)
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10/15/2010 11:57 AM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
Thank you for being you.
 Quoting: Anonymous Coward 1092465

:coolone5:
Anonymous Coward (OP)
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10/15/2010 12:09 PM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
:boobbump:
Anonymous Coward
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10/15/2010 12:22 PM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
Welp, I think if you have seen a lot of aurora (and I have) you'd have already guessed that it pulses ;)

Most spectacular display I have ever seen was in November (??? February???) of 98, 99. Dang, can't remember which month. I do know that ALL of us in the neighborhood were bundled up, and outside watching the show for hours on end.

Now that I know more, I wonder what event happened on the sun to trigger this?
Anonymous Coward (OP)
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10/15/2010 12:24 PM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
Welp, I think if you have seen a lot of aurora (and I have) you'd have already guessed that it pulses ;)

Most spectacular display I have ever seen was in November (??? February???) of 98, 99. Dang, can't remember which month. I do know that ALL of us in the neighborhood were bundled up, and outside watching the show for hours on end.

Now that I know more, I wonder what event happened on the sun to trigger this?
 Quoting: Anonymous Coward 1131224


I've never seen them...must be incredible.
Anonymous Coward (OP)
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10/15/2010 02:29 PM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
:boobbump:
Anonymous Coward
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10/15/2010 10:17 PM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
bump for pulsing
Anonymous Coward
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10/18/2010 05:41 PM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
:boobbump:
 Quoting: Sickscent
BROKEN

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10/18/2010 05:44 PM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
eyeballer
"The individual is handicapped by coming face to face
with a conspiracy so monstrous he cannot believe it exists."
J. Edgar Hoover

"Those who make Peaceful Revolution Impossible...Will make Violent Revolution Inevitable"
-JFK

:minimoran:
Anonymous Coward
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10/18/2010 05:48 PM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
This might be a dumb question but why do they only happen so far north? Are the waves more prevalant in that region or what...or is it due to the earths energy flow or the temperature?
Anonymous Coward
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10/18/2010 05:58 PM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
:eyeballer:
 Quoting: BROKEN


lmfao!
Anonymous Coward
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10/18/2010 05:59 PM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
This might be a dumb question but why do they only happen so far north? Are the waves more prevalant in that region or what...or is it due to the earths energy flow or the temperature?
 Quoting: ArunaLuna


I'd have to get confirmation, but it has to do with the dipole of the earth...
Anonymous Coward
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10/19/2010 11:56 AM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
Cool.

The Earth's magnetic field looks like that of a dipole magnet where the field lines are coming out and going into the Earth near the poles. The auroral electrons are thus guided to the high latitude atmosphere.

As they penetrate into the upper atmosphere, the chance of colliding with an atom or molecule increases the deeper they go. Once a collision takes place, the atom or molecule takes some of the energy of the energetic particle and stores it as internal energy while the electron goes on with a reduced speed.

The process of storing energy in a molecule or atom is called "exciting" the atom. An excited atom or molecule can return to the non-excited state (ground state) by sending off a photon, i.e. by making light.


[link to odin.gi.alaska.edu]
Anonymous Coward
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10/21/2010 07:39 PM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
Cool.

The Earth's magnetic field looks like that of a dipole magnet where the field lines are coming out and going into the Earth near the poles. The auroral electrons are thus guided to the high latitude atmosphere.

As they penetrate into the upper atmosphere, the chance of colliding with an atom or molecule increases the deeper they go. Once a collision takes place, the atom or molecule takes some of the energy of the energetic particle and stores it as internal energy while the electron goes on with a reduced speed.

The process of storing energy in a molecule or atom is called "exciting" the atom. An excited atom or molecule can return to the non-excited state (ground state) by sending off a photon, i.e. by making light.


[link to odin.gi.alaska.edu]
 Quoting: ArunaLuna


You rock...thanks Aruna
apprentice

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bump
ShadowDancer

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01/21/2012 05:11 PM
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Re: The Pulsating Aurorae Mystery Solved - Blinking Northern Lights Driven by ELECTROMAGNETIC CHORUS WAVES
You don't say





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