D REGION Meaning and
Definition
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The D region refers to a specific atmospheric layer within the ionosphere, a region of the Earth's upper atmosphere that is ionized by solar radiation. It is located approximately 60 to 90 kilometers (37 to 56 miles) above the Earth's surface, overlapping with the lower part of the E region and upper part of the lower ionosphere.
The D region is particularly important for the study of radio wave propagation and communication since it strongly affects the Earth's ionospheric properties. It is characterized by a higher electron density compared to the E and F regions, but lower than that of the lower ionosphere. This makes it a critical part of the ionosphere for long-range radio signals, as it absorbs frequencies in the lower part of the radio spectrum, such as Medium Wave (AM) radio frequencies.
The density of free electrons in the D region varies considerably, influenced by factors such as solar activity, time of day, and geographic location. It is particularly dependent on the intensity of solar radiation during the day, which ionizes the atoms in the upper atmosphere and increases electron density. At night, the D region undergoes a process called recombination, resulting in the decrease of free electrons and a drop in electron density.
Overall, the D region plays a crucial role in radio communication and the understanding of ionospheric behavior. Its study is essential for predicting and mitigating the effects of ionospheric disturbances on radio signal propagation.
Common Misspellings for D REGION
- s region
- x region
- c region
- f region
- r region
- e region
- d eegion
- d degion
- d fegion
- d tegion
- d 5egion
- d 4egion
- d rwgion
- d rsgion
- d rdgion
- d rrgion
- d r4gion
- d r3gion
- d refion
Etymology of D REGION
The term "D region" originates from the field of ionospheric physics. It is derived from the word "daytime" because the D region is primarily active during daylight hours.
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