The interval of Earth's atmosphere, at an elevation between 50 and 400 km, containing abundant positive ions.

Region of the Earth's atmosphere that is ionized by the Sun's emissions

The part of the earth's atmosphere extending from 50 kilometers above the surface to about 1000 kilometers, and consisting of ionized gases. The aurora is produced when electrons from the sun's solar wind disturb the earth's magnetic field and interact with molecules in the ionosphere. (TOP OF THE PAGE) (CLOSE WINDOW)

is a layer of ionized atmosphere beginning at an altitude of 56 to 90 kilometers above the Earth's surface. This layer is electrically conductive. Its altitude and density varies over the day. In theory there is no upper limit to the ionosphere, yet detection of its upper layers is accomplished only infrequently.

shortwave travel around the earth by bouncing between the earth and the ionosphere (The part of the earth's atmosphere that reflects shortwave back to the earth)

A region of the Earth's atmosphere where ionization caused by incoming solar radiation affects the transmission of radio waves. It extends from a height of 43 miles (70 kilometers) to 250 miles (450 kilometers) above the surface.

The ionizing action of the sun's radiation on the earth's upper atmosphere produces free electrons. Above about 60km the number of these free electrons is sufficient to affect the propagation of electromagnetic waves. This "ionized" region of the atmosphere is a plasma and is referred to as the ionosphere.

A region in the atmosphere above 50 kilometers from the surface where relatively large concentrations of ions and free electrons exist. The ionosphere is important for human communications because it re-directs AM radio transmissions. This process extends the distance that radio transmissions can travel.

That region of Earth's atmosphere so named because of the presence of ionized atoms in layers that reflect radio waves and short-wave transmissions

the upper region of the Earth's atmosphere, between 50 and 400 km above the Earth's surface. It contains free electrons originating from the ionization caused by ultraviolet radiation and x rays from the sun. The ionosphere reflects radio waves, and also radiation from outer space.

Layer in Earth's atmosphere above about 100 km where the atmosphere is significantly ionized, and conducts electricity.

The upper part of the atmosphere, which contains a substantial fraction of ionized particles, as a result of the absorption of high-energy solar radiation. Overlaps and includes the outer regions of the atmosphere which are defined according to their temperature gradients.

The part of the earth's atmosphere that is ionized by the sun's radiation. it extends above the earth from about 60km (about 36 miles) on out. Radio waves move easily through the ionosphere.

The part of the atmosphere, between the mesosphere and exosphere. Sufficient quantities of ions and free electrons exist to reflect and/or refract electromagnetic waves.

a layer of charged particles found in the upper layers of an atmosphere created when gas molecules are ionized

a region of electrically charged gas that exists at the top of some planetary atmospheres

a region covering the highest layers in the Earth's atmosphere, containing an appreciable population of ions and free electrons. The ions are created by sunlight ranging from the ultra-violet to x-rays. In the lowest and least rarefied layer of the ionosphere, the D-layer (around 70 km or 45 miles), as soon as the Sun sets the ions and electrons recombine, but in the higher layers, collisions are so few that its ion layers last throughout the night

part of the atmosphere starting at an altitude of 25 miles and extending to 250 miles; area where free particles exist and can be used for the transmission of radio waves. Click here to see an image

The ionized regions of the upper atmosphere that conduct radio waves

the region of the atmosphere roughly 100–1000 km in altitude that contains a significant concentration of electrons and ions produced by the ionizing action of the Sun's radiation (ultraviolet and X rays) on atmospheric particles

The highest layer of the atmosphere. The top of the ionosphere is the border to free space.

the layer of free electrons ranging from about 50 to 1000 km above the earth

The layers of ionized air in the upper atmosphere (above about 70 kilometers). Depending on frequency, the ionosphere refracts radio signals to cause blockage, alter their path or impact the propagation speed. Navigation signals penetrating the ionosphere are delayed. These delays can be either predicted using (not terribly accurate) models, or measured using dual-frequency receivers.

Ionosphere is the upper region of the earth's atmosphere, which has been ionized mainly by solar radiation.

The outer layers of the Earth's atmosphere (above 50 miles from the surface of the Earth), where many of the gas atoms are ionized by high-energy extraterrestrial radiation.

Rarefied, ionized region of the Earth's atmosphere, between approximately 60 and 400 km. Source: EPO.

The area of Earth's atmosphere that extends from about 50 to 300 miles above the surface of the planet and is made up of multiple layers dominated by electrically charged, or ionized, atoms. Here, ultraviolet rays from the Sun and high energy particles from Earth's magnetosphere bombard the gases of our upper atmosphere. They collide with the atoms, knowing off electrons and leaving the positively charged nuclei – called ions – floating free. Because of these ions and electronics, the ionosphere can conduct electricity.

Upper levels of the earth's atmosphere, extending outward from about 70 kilometers altitude and containing free electronically charged particles that reflect radio waves. See pp. 64-65.

Region of Earth's atmosphere 50 to 250 miles above the earth's surface named for presence of ionized atoms in layers that reflect radio waves and short-wave transmissions.

The part of the Earth's atmosphere above about 50 km where the atoms are significantly ionized and affect the propagation of radio waves.

The band of charged particles 80 to 120 miles above the earth's surface.

An atmospheric layer dominated by charged, or ionized, atoms that extends from about 38 to 400 miles above the Earth's surface.

electricity conducting layers in the earth's upper atmosphere

A layer of the earth's atmosphere whose properties cause it to reflect and refract certain Radio Waves back to Earth, particularly those in the HF band.

an upper layer of the atmosphere where many atoms lose one or more electrons, or are "ionized" by energy from sunlight each day.

An electrified region of the upper atmosphere where fairly large concentrations of ions and free elections exist.

The upper region of the Earth's atmosphere in which many of the atoms are ionized.

The electrically-charged layer of the atmosphere that extends from 80 to 400 kilometres (50 to 250 miles) above the Earth's surface. The ionosphere absorbs much of the short wave-length radiation from the sun. As the radiation passes through the ionosphere, it interacts with nitrogen molecules and oxygen atoms. These molecules and atoms absorb the radiation, but in the process they lose an electron (a negatively charged particle) and become a positively charged ion. The ionosphere is where auroras originate.

atmospheric layer that exists from 50 to 250 miles above the earth= s surface and contains electrically charged particles.

The atmospheric shell characterized by a high ion density. Its base is at about 70 or 80 km and it extends to an indefinite height.

The upper reaches of a planetary atmosphere, where the atoms become ionized in sufficient numbers to provide an electrically conducting medium.

The ionosphere is one of the highest layer of the Earth's atmosphere. The ionosphere starts at about 43-50 miles (70-80 km) high and continues for hundreds of miles (about 400 miles = 640 km). It contains many ions and free electrons ( plasma). The ions are created when sunlight hits atoms and tears off some electrons. The ionosphere is located between the mesosphere and the exosphere (and is part of the thermosphere). Auroras occur in the ionosphere.

Region of ionized gases surrounding the Earth and extending from about 60 km (33 naut. mi) to distances up to several hundred kilometers. The ionization in this region is due to bombardment by ultraviolet radiation and X - rays from the Sun, and by cosmic rays. The existence of this region makes possible longrange radio communications through reflection of terrestrial radio transmission.

the region of the Earth's atmosphere which is electrically charged; between 50 km and 600 km above the surface of the Earth.

The highest region of the Earth’s atmosphere containing free electrons and ions.

a region of intense ionization of the high atmosphere of a planet.

The outer region of the Earth's atmosphere; contains a high concentration of free electrons.

A layer of the Earth's atmosphere ranging from about 100 to 700 kilometers above the surface, where oxygen and nitrogen are ionized by sunlight, producing free electrons.

The region of the Earth upper atmosphere that contained a small percentage of electrons and free ions produced by photoionization of the components of the atmosphere by the ultraviolet radiation to pave. Ionosphere perceivably influences the propagation of radiowave of frequencies less than near 30 megaciclos.

A region of charged particles in a planet's upper atmosphere; the part of the earth's atmosphere beginning at an altitude of about 400 kilometers (25 miles) and extending outward 400 kilometers (250 miles) or more.

A region of the earth's atmosphere where ionization caused by incoming solar radiation affects the transmission of radio waves. It extends from a height of 70 kilometers (43 miles) to 400 kilometers (250 miles) above the surface.

A area of the earth's atmosphere where ionization caused by incoming solar radiation affects the transmission of GPS radio waves. The ionosphere extends from a height of 50 kilometers (30 miles) to 400 kilometers (250 miles) above the surface.

A radio-reflecting region high in Earth's atmosphere in which solar radiation has removed an electrton from some of the atoms resulting in the ionization of that gas molecule.

The most important region of the atmosphere extending from 31 miles to 250 miles above sea level. Contains four cloud-like layers that affect radio waves.

the atmospheric layer between the mesosphere and the exosphere; it is part of the thermosphere.

a region of gases, very high up in the atmosphere, that contains ionized gases.

A partially conducting region of the Earths atmosphere between 50 kms and 400 kms high.

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.

Upper atmospheric region from about 50 to 400 kilometers where the air is ionized into discrete layers (D,E,F1, and F2 layers) by the Sun's ultraviolet and X-ray radiation.

The electrically charged region of the Earth's atmosphere located approximately 40 to 400 miles above the Earth's surface that refracts radio signals.

The 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. It has practical importance because, among other functions, it influences radio propagation to distant places on the Earth.