Altitude of Emission: Green auroras are the most common and intense, produced when charged particles collide with oxygen at altitudes of about 100 to 300 kilometers (approximately 60 to 190 miles).
The high concentration of oxygen at these altitudes leads to a strong green emission, which is also the wavelength the human eye is most sensitive to.
Red auroras occur at higher altitudes (around 180 to 250 kilometers or 112 to 155 miles) and are less frequent due to the lower concentration of oxygen at these heights.
Nitrogen Emissions: Blue and purple auroras, on the other hand, are produced when solar particles collide with nitrogen at lower altitudes (below 100 kilometers or about 62 miles).
The density of nitrogen is lower than that of oxygen at these altitudes, resulting in weaker emissions. Consequently, the intensity of blue and purple hues is generally much lower than that of green and red.
Visibility and Human Perception: The human eye is more sensitive to green light, making green auroras appear brighter and more prominent
While blue and purple can be present, they are often overshadowed by the more intense green light, making them less noticeable during typical auroral displays.
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