I believe the particles are different. They enter the atmosphere at different velocity and from various angles.When we see the aurora moving rapidly are we effectively seeing the Earths Magnetic field moving ? Is that part of the explanation for the morphology of the aurora and why they never look quite the same?
YesWhen we see the aurora moving rapidly are we effectively seeing the Earths Magnetic field moving ?
Exactly, and this is particularly true when there are strong blasts of charged particles from the sun. The 2 main sources of these intense bursts of particles are from solar flares ( @thisisweak ) and from coronal holes.The Earth's magnetic field is not static unchanging, and the solar wind is not either.