| Electrical Communication is a free textbook on the basics of communication technology. See the editorial for more information.... |
|
Home  Radio Wave Propagation and Antennas The Troposphere |
|
 Search the VIAS Library | Index
|
  |
The TroposphereEnergy absorption occurs in the troposphere.3,7 A second effect is that the air, being more dense at the surface of the earth, causes a radio wave, or ray, near the surface to travel more slowly than a ray in the upper troposphere, thus bending the waves around the earth. Hence, the direct and ground-reflected waves of Fig. 3 should be bent downward slightly. A third effect is explained as follows: From the definition on page 443 it would be concluded that an increase in altitude is always accompanied by a decrease in temperature. However, temperature inversions often occur in which moist warm air overlays cold dry air. Such discontinuities cause a wave to be refracted and may cause reflections to occur (page 446).
|
|
| Home Radio Wave Propagation and Antennas The Troposphere |
|
Last Update: 2011-05-30