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UNIT 5—LESSON 3

PHOTOMETEORS

OVERVIEW Identify the character and characteristics of light and describe reflection and refraction. Identify the characteristics of photometers (halos, coronas, rainbows, fogbows, mirages, looming, scintillation, and crepuscular rays).

OUTLINE

Light

Reflection

Refraction

Atmospheric optical phenomena

Halos

Coronas

Rainbows

Fogbows

Mirages

Looming

Scintillation

Crepuscular rays

PHOTOMETEORS

Photometers are any of a number of at-mospheric phenomena which appear as luminous patterns in the sky. While they constitute a variety of fascinating optical phenomena, photometers are not active elements; that is, they generally do not cause adverse weather. However, many are related to clouds which do cause adverse weather. Therefore, they help in describing the state of the atmosphere.

Learning Objective: Identify the character and characteristics of light and describe reflection and refraction.

LIGHT

Light, acting in conjunction with some of the elements of the atmosphere, produces a variety of atmospheric phenomena, such as halos, coronas, mirages, rainbows, and crepuslar rays. This lesson discusses the theories of light and the resulting photo-meters. Light is the portion of the electromagnetic spectrum that can be detected by the human eye. It travels at the same speed as all other elec-tromagnetic radiation (186,000 miles per second).

However, the characteristics of light are con-siderably different from other regions of the electromagnetic spectrum because of the dif-ferences in wavelength and frequency.

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