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  2. F region - Wikipedia

    en.wikipedia.org/wiki/F_region

    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.

  3. Ionosphere - Wikipedia

    en.wikipedia.org/wiki/Ionosphere

    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.

  4. Radio window - Wikipedia

    en.wikipedia.org/wiki/Radio_window

    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]

  5. F2 propagation - Wikipedia

    en.wikipedia.org/wiki/F2_propagation

    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).

  6. Birkeland current - Wikipedia

    en.wikipedia.org/wiki/Birkeland_current

    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]

  7. Whoopsie, SpaceX Blew Up Two Rockets and Punched a ... - AOL

    www.aol.com/whoopsie-spacex-blew-two-rockets...

    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.

  8. Trump says RFK Jr. will investigate the discredited link ...

    www.aol.com/trump-says-rfk-jr-investigate...

    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 ...

  9. Total electron content - Wikipedia

    en.wikipedia.org/wiki/Total_electron_content

    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.