Blue auroras are rarer and occur when nitrogen molecules are excited by high-energy particles. This happens at lower altitudes (around 60-120 km) where atmospheric density is higher.
Wavelength: Between 428-470 nm, giving off a blue or violet hue.
Combination of Blue and Green
Overlap: When auroras occur at varying altitudes with different gases being excited, green and blue light can overlap, creating a vibrant, multicolored display.
The balance of these colors depends on solar activity, altitude, and viewing conditions.
Photographing or Seeing the Colors
The human eye perceives green auroras more easily because the human retina is more sensitive to green light in low-light conditions.
Cameras, however, can capture the full spectrum of the aurora, revealing vibrant blues alongside greens.
Captured 10/10/24
Aurora Rarest Color Scheme
