p.2 #1 · Amazing Aurora Borealis video with Sony A7S
LFajardo wrote:
In simplified terms: The surface of the sun is made up of charged, fast-moving particles. Moving charges produce magnetic fields. The surface is a sea of magnetic storms. Once in a while a storm ejects a burst of particles (ions) in our direction.
There is a constant stream of particles from within the sun(a byproduct of fusion).
Magnitic lines of force from within the sun get twisted, which create loops that capture and hold material, sometimes those loops of magnetic lines of force break which launch that material into space at high velocity(Coronal Mass Ejection).
Fortunately, the earth's magnetic field deflects most of the burst of ions. [Otherwise, no life on earth. ] But around the magnetic poles, some of the ions spiral in - knocking electrons out of the gases in the upper atmosphere. The electrons quickly recombine with the gases, emitting light.
Other process is the same as a Neon light.
The popping noise is akin to electronic static. Or micro-miniature burst of lightening.
For, the worry worts in the crowd: In the 1850's there was a massive burst (coronal mass ejection) that the earth's magnetic field could not deflect. It wiped out most of the telegraph service. The next one this size, will destroy satellites and wireless telecommunication. Dont worry - just keep some uv-5000000 suntan lotion on hand.
Sattalites are shutdown if they are in the line of fire to protect them.
A nice video of a CME
p.2 #2 · Amazing Aurora Borealis video with Sony A7S
Living at the same place as the video was shot (Tromsų at nearly 70˚N) I would say that this aurora is a particularly strong one, we have had some really nice auroras the last nights.
To see movement and colour like this the aurora should be as close as possible, which means right above your head, the movements closer to the horizon seems much slower.
p.2 #3 · Amazing Aurora Borealis video with Sony A7S
Is it possible that this is so dramatic because he is using such a high ISO? Wouldn't that make the camera more sensitive to light? We see it all the time with star shots looking towards the center of the milky way where the picture has more detail that our eyes cannot see.
] But around the magnetic poles, some of the ions spiral in - knocking electrons out of the gases in the upper atmosphere. The electrons quickly recombine with the gases, emitting light.