The atmosphere is a massive laboratory for the physics of light
In short: Every time you see a sunset or a shimmering mirage, you are witnessing a complex interplay of physics. Our atmosphere acts as a filter and a prism, transforming raw radiation from the Sun and Moon into the visual spectacles we see every day.
Atmospheric phenomena are essentially illustrations of optics in action. When light from the Sun, Moon, or stars enters our atmosphere, it interacts with air molecules, dust, water droplets, and tiny ice crystals. These interactions cause the light to be reflected, refracted, diffracted, dispersed, absorbed, and scattered. This process creates a wide range of visual effects, from common daily occurrences to rare, spectacular mirages.
Water vapour serves as a key medium for the process of absorption. Our atmosphere contains more than 10 trillion tons of water, functioning as a principal sunlight absorber. Heat is drawn from the light to warm the substance, which then releases it as far-infrared thermal radiation. This effectively attenuates the light and reduces the range of wavelengths that reach the ground.
The timing of these phenomena is often dictated by the seasons. For example, winter is a particularly good time to observe certain effects because the Sun sits lower in the sky. These conditions, combined with high thin layers of icy cirrus clouds, create the specific environment needed for many atmospheric visions to manifest. While some effects are predictable and common, others are so rare that witnessing them requires significant luck and alertness to specific atmospheric conditions.
Professor Carolin Crawford, a long-time astronomer and educator, highlights that many of these phenomena occur so frequently that people often overlook them. By understanding the underlying physics—how radiation is filtered by gases and redistributed by scattering—we can better appreciate the invisible processes that shape our visual experience of the world.
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Sources
- Summary by Intellect · source: Atmospheric Phenomena - Professor Carolin Crawford
- Also: Atmospheric Phenomena
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