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ELECTRICAL CLASSIFICATION.— The primary concern with the electrical classification is the effect on communications and radar. The electrical classification outlines three zones—the troposphere, the ozonosphere, and the iono-sphere.

Troposphere.— The troposphere is important to electrical transmissions because of the immense changes in the density of the atmosphere that occur in this layer. These density changes, caused by differences in heat and moisture, affect the electronic emissions that travel through or in the troposphere. Electrical waves can be bent or refracted when they pass through these different layers and the range and area of communications may be seriously affected.

Ozonosphere.— This layer is nearly coincident with the stratosphere. As was discussed earlier in this section, the ozone found in this zone is responsible for the increase in temperature with height in the stratosphere.

Ionosphere.— The ionosphere extends from about 40 miles (200,000 ft or 64 kilometers) to an indefinite height. Ionization of air molecules in this zone provides conditions that are favorable for radio propagation. This is because radio waves are sent outward to the ionosphere and the ionized particles reflect the radio waves back to Earth.

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