An "orange sunrise" often signifies specific atmospheric conditions that affect how sunlight is scattered. According to the reference, it suggests a high-pressure air mass with stable air trapping particles, like dust, which scatters the sun's blue light.
Here's a breakdown:
- High-Pressure System: The presence of a high-pressure system is a key factor. These systems are generally associated with stable air.
- Trapped Particles: The stable air in a high-pressure system tends to trap particles like dust, pollen, and pollutants.
- Scattering of Blue Light: These particles effectively scatter the shorter wavelengths of blue light from the sunlight.
- Dominance of Red/Orange Light: As the blue light is scattered away, the longer wavelengths of red and orange light become more dominant, resulting in the orange/red hue of the sunrise.
In essence, an orange sunrise indicates that the atmosphere is filled with more particles than usual, leading to a specific scattering effect. The reference also notes that this high pressure is moving east, and a low pressure system is moving in from the west.
