Ionosphere: is the part of the atmosphere that is ionized by solar radiation. It plays an important part in atmospheric electricity and forms the inner edge of the magnetosphere.
Ionosphere A layer in the atmosphere above 80 km (50 mi), where gamma, X-ray, and some ultraviolet radiation is absorbed and converted into infrared, and where the solar winds stimulates the auroras.
Ionosphere An electrified region of the upper atmosphere where fairly large concentrations of ions and free electrons exist.
Ionosphere The region of the upper atmosphere from 80 to 900 km (50 to 600 mi) that contains a relatively high concentration of ions (electrically charged particles).
Isobars Lines on a map joining localities reporting the same air pressure.
Ionosphere - A complex atmospheric zone of ionized gases extending between 80 and 400 kilometers, thus coinciding with the lower thermosphere and heterosphere.
Ionosphere- Also known as the thermosphere. A layer in the atmosphere above the mesosphere extending from about 80km above the Earth's surface. It can be considered a distinct layer due to a rise in air temperature with increasing height.
IONOSPHERE
A complex atmospheric zone of ionized gases that extends between 50 and 400 miles (80 to 640 kilometers) above the earth's surface. It is located between the mesosphere and the exosphere and is included as part of the thermosphere.
Ionosphere- The lower part of the thermosphere, where electrically charged particles called ions are found.
Isobars- Lines on a map joining places that have the same air pressure.
IONOSPHERE - Upper portion of the atmosphere above the mesosphere. Extremely thin air at these altitudes is exited by the solar radiation causing the gas to become ionized.
DDustD RegionIn solar-terrestrial terms, a daytime layer of the earth's ionosphere approximately 50 to 90 km in altitude.
M 3000In solar-terrestrial terms, the optimum high frequency radio wave with a 3000 km range, which reflects only once from the ionosphere (single hop transmission)M2/S2m2/s2 (meters squared per second squared), ...
It is a region of steadily increasing temperature with altitude, and includes all of the exosphere and most, if not all, of the ionosphere.
FLWFollow (or) Flow- WindFMFrom or FathomfMinIn solar-terrestrial terms, the lowest radiowave frequency that can be reflected from the ionosphere.
They are most abundant, and have the greatest importance, in the ionosphere, between about 70 and 300 km in altitude. 2.
When disturbances occur in the Solar Wind or there is an energetic Solar Flare, the particles are accelerated along the field lines, becoming more dense near the magnetic poles and eventually precipitating into the Earth's ionosphere.
In solar-terrestrial terms, an anomalous condition of the polar ionosphere whereby HF and VHF (3 - 300 MHz) radiowaves are absorbed, and LF and VLF (3 - 300 kHz) radiowaves are reflected at lower altitudes than normal.
MESOSPHERE
The layer of the atmosphere located between the stratosphere and the ionosphere, where temperatures drop rapidly with increasing height. It extends between 31 and 50 miles (17 to 80 kilometers) above the earth's surface.
region of the earth's atmosphere above the mesopause , starting at 80 km (50 mi) altitude, where the air temperature increases with altitude. The thermosphere extends outward toward space and includes the exosphere and most or all of the ionosphere.
A thermal classification, it is the layer of the atmosphere located between the mesosphere and outer space. It is a region of steadily increasing temperature with altitude, and includes all of the exosphere and most, if not all, of the ionosphere.
In the case of the earth, it is held more or less near the surface by the earth's gravitational attraction. The divisions of the atmosphere include the troposphere, the stratosphere, the mesosphere, the ionosphere, and the exosphere.
Clouds are very close to black-body radiators, in spite of their white color in sunlight. There are interesting electrical phenomena at the tops of thunderclouds, connecting them with the ionosphere, only recently discovered.
Existing evidence suggests that lightning discharges occurring sporadically at all times in various parts of the earth, perhaps 100 per second, may be the principal source of negative charge that maintains the earth-ionosphere potential difference ...
 See also: Earth, Surface, Atmosphere, Water, Temperature
  
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