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  2. Ionospheric heater - Wikipedia

    en.wikipedia.org/wiki/Ionospheric_heater

    This gives an energy density in the ionosphere that is less than 1/100 of the thermal energy density of the ionospheric plasma itself. [1] The power flux may also be compared with the solar flux at the Earth's surface of about 1.5 kW/m 2. During aurora generally no ionospheric effects can be observed with the HF pump facilities as the radio ...

  3. International Reference Ionosphere - Wikipedia

    en.wikipedia.org/wiki/International_Reference...

    It is the international standard empirical model for the terrestrial ionosphere since 1999. For a specified geographic location, time, and date, IRI provides average monthly values for electron density, electron temperature and ion temperature, and the molecular composition of the ions in the range of altitudes from 50 km to 2000 km. [ 1 ] The ...

  4. 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. The ionosphere is ionized by solar ...

  5. Fire extinguisher - Wikipedia

    en.wikipedia.org/wiki/Fire_extinguisher

    An empty fire extinguisher which was not replaced for years. Most countries in the world require regular fire extinguisher maintenance by a competent person to operate safely and effectively, as part of fire safety legislation. Lack of maintenance can lead to an extinguisher not discharging when required, or rupturing when pressurized.

  6. EN 3 - Wikipedia

    en.wikipedia.org/wiki/EN_3

    EN 3-9: Portable fire extinguishers. Additional requirements to EN 3-7 for pressure resistance of CO 2 extinguishers. EN 3-10: Portable fire extinguishers. Provisions for evaluating the conformity of a portable fire extinguisher to EN 3-7. EN 3-1, EN 3-2, EN 3-4 and EN 3-5 have been withdrawn and were replaced by EN 3-7, EN 3-8 and EN 3-9. [2 ...

  7. Bromochlorodifluoromethane - Wikipedia

    en.wikipedia.org/wiki/Bromochlorodifluoromethane

    Bromochlorodifluoromethane (BCF), also referred to by the code numbers Halon 1211 and Freon 12B1, is a haloalkane with the chemical formula C F 2 Cl Br.It is used for fire suppression, especially for expensive equipment or items that could be damaged by the residue from other types of extinguishers. [1]

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