2016_03_06 Aurora (ex-coronal hole 718) 13
An old one from the display on 6th March 2016.
A double arc
A coronal hole allowed high speed solar wind to excite and accelerate charged particles in Earth's magnetosphere which then flow down Northern and Southern magnetic field lines.
Kp = 5
Solar wind speed = 489.3 km/s
IMF Total = 14.8 nT
IMF Bz = 8.2nT South
University of Lancaster magnetometer = 97.7nT deviation from mean.
Samyang 24mm f/1.4 lens at f/2