Pulsating Aurora Mysteries Uncovered with Help from NASA’s THEMIS Mission

Go down

Pulsating Aurora Mysteries Uncovered with Help from NASA’s THEMIS Mission

Post by Dragon on Wed Feb 21, 2018 8:27 pm

Sometimes on a dark night near the poles, the sky pulses a diffuse glow of green, purple and red. Unlike the long, shimmering veils of typical auroral displays, these pulsating auroras are much dimmer and less common. While scientists have long known auroras to be associated with solar activity, the precise mechanism of pulsating auroras was unknown. Now, new research, using data from NASA’s Time History of Events and Macroscale Interactions during Substorms — or THEMIS — mission and Japan’s Exploration of energization and Radiation in Geospace — shortened to ERG, or also known as Arase — satellite, has finally captured the missing link thought responsible for these auroras. The answer lies in chirping waves that rhythmically pulse the particles that create the auroras.

Continued...
Source

 
avatar
Dragon
Senior Administrator
Senior Administrator

Posts : 1406
Points : 2394
Join date : 2018-01-18

Back to top Go down

Re: Pulsating Aurora Mysteries Uncovered with Help from NASA’s THEMIS Mission

Post by Dragon on Wed Feb 21, 2018 8:29 pm


Credits: NASA

Illustration of three THEMIS satellites and Earth's magnetosphere.

Source / Image Courtesy

 
avatar
Dragon
Senior Administrator
Senior Administrator

Posts : 1406
Points : 2394
Join date : 2018-01-18

Back to top Go down

Re: Pulsating Aurora Mysteries Uncovered with Help from NASA’s THEMIS Mission

Post by Dragon on Wed Feb 21, 2018 8:30 pm


Credits: ISAS/JAXA

Illustration of the ERG satellite in orbit

Source / Image Courtesy

 
avatar
Dragon
Senior Administrator
Senior Administrator

Posts : 1406
Points : 2394
Join date : 2018-01-18

Back to top Go down

Re: Pulsating Aurora Mysteries Uncovered with Help from NASA’s THEMIS Mission

Post by Dragon on Wed Feb 21, 2018 8:31 pm



Substorms produce dynamic changes in the auroral displays seen near Earth's northern and southern magnetic poles, causing an especially energetic burst of light and movement in the Northern and Southern Lights. These changes transform auroral displays into auroral eruptions.

 
avatar
Dragon
Senior Administrator
Senior Administrator

Posts : 1406
Points : 2394
Join date : 2018-01-18

Back to top Go down

Re: Pulsating Aurora Mysteries Uncovered with Help from NASA’s THEMIS Mission

Post by Dragon on Wed Feb 21, 2018 8:32 pm



THEMIS observations confirm for the first time that magnetic reconnection in the magnetotail triggers the onset of substorms. Substorms are the sudden violent eruptions of space weather that release solar energy trapped in the Earth's magnetic field.

 
avatar
Dragon
Senior Administrator
Senior Administrator

Posts : 1406
Points : 2394
Join date : 2018-01-18

Back to top Go down

Re: Pulsating Aurora Mysteries Uncovered with Help from NASA’s THEMIS Mission

Post by Sponsored content


Sponsored content


Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum