- the region of the earth's atmosphere between the stratosphere and the exosphere, consisting of several ionized layers and extending from about 50 to 250 miles (80 to 400 km) above the surface of the earth.
Origin of ionosphere
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for ionosphere
Then we were able to modify that to heave sand and to let it tap the ionosphere.
They struck the Earth's ionosphere, and their numbers diminished.Out Like a Light
Gordon Randall Garrett
The ionosphere of Eisberg was much deeper and, although the intensity was less, the duration was much longer.
Without the landing grid and the power it took from the ionosphere, they could not receive supplies from the rest of the universe.
It was not the intensity of the ionosphere that cracked the drive of the Brainchild; it was the duration.
Word Origin and History for ionosphere
Online Etymology Dictionary, © 2010 Douglas Harper
- A region of the Earth's upper atmosphere, extending from a height of 70 km (43 mi) to 400 km (248 mi) and containing atoms that have been ionized by radiation from the Sun. The ionosphere lies mostly in the lower thermosphere and is subdivided into three regions, the D region (70 km to 90 km; 43 to 56 mi), the E region (90 km to 150 km; 56 to 93 mi), and the F region (150 km to 400 km; 93 to 248 mi). The concentration of ionized atoms is lowest in the D region, intermediate in the E region, and highest in the F region. The ionosphere is useful for radio transmission because radio waves, which normally propagate in straight lines, are reflected off the ionized gas particles, thereby being transmitted long distances across the Earth's curved surface. See more at D region E region F region.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A region of the atmosphere that begins at an altitude of about thirty miles.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.