Search results
Results from the WOW.Com Content Network
The F region of the ionosphere is home to the F layer of ionization, also called the Appleton–Barnett layer, after the English physicist Edward Appleton and New Zealand physicist and meteorologist Miles Barnett. As with other ionospheric sectors, 'layer' implies a concentration of plasma, while 'region' is the volume that contains the said layer.
Relationship of the atmosphere and ionosphere. The ionosphere (/ aɪ ˈ ɒ n ə ˌ s f ɪər /) [1] [2] is the ionized part of the upper atmosphere of Earth, from about 48 km (30 mi) to 965 km (600 mi) above sea level, [3] a region that includes the thermosphere and parts of the mesosphere and exosphere.
The radio window is the region of the radio spectrum that penetrate the Earth's atmosphere. Typically, the lower limit of the radio window's range has a value of about 10 MHz (λ ≈ 30 m); the best upper limit achievable from optimal terrestrial observation sites is equal to approximately 1 THz (λ ≈ 0.3 mm). [1] [2]
In November 1938, 405-line video from the BBC Alexandra Palace television station (London, England) on channel B1 (45.0 MHz) was received in New York, US. [1]In 1958, the FM broadcast radio DX record was set by DXer Gordon Simkin in southern California, United States, when he logged a 45 MHz commercial FM station from Korea via trans-Pacific F2 propagation at a distance of 5,000 miles (8,000 km).
Together with the (partial) ring current, Region 1 and Region 2 currents form the convection circuit, which is associated with the Dungey cycle. [2] On the day-side, around noon, another type of FAC can be found: Region 0 currents, going into and out of the ionospheric polar cap, the direction of which is decided by the direction of the IMF. [2]
SpaceX’s rocket explosion in November 2023 created a massive hole in the Earth's ionosphere, providing scientists with a rare opportunity to study its effects.
Autism diagnoses have risen from about 1 in 150 children in 2000 to 1 in 36 today, though researchers have pointed to increased screening and changing definitions of the condition as the basis for ...
TEC plot for the continental USA, made on 2013-11-24. Total electron content (TEC) is an important descriptive quantity for the ionosphere of the Earth. TEC is the total number of electrons integrated between two points, along a tube of one meter squared cross section, i.e., the electron columnar number density.