TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

RELATIVE IONOSPHERIC OPACITY METER [1 record]

Record 1 2011-06-07

English

Subject field(s)
  • Scientific Instruments
  • Geophysics
  • Weather Stations and Meteorological Instruments and Equipment
DEF

Instrument for measuring the opacity of the ionosphere during the absence of ionospheric disturbances by determining the absorption of electromagnetic energy emitted by an extraterrestrial cosmic radio noise.

CONT

Riometers measure the absorption of radio-noise from the stars ('cosmic-noise') in the ionosphere. They usually operate at frequencies between 25Mhz and 50 Mhz where radio-waves are absorbed when there are significant numbers of free electrons in the height region from about 60-110 km. They make continuous observations of the noise-level and observe deceases in noise relative to the quiet-day level, when high-energy electrons and protons precipitate and cause increased ionisation.

OBS

From RIO (relative ionospheric opacity) and meter (measuring device).

French

Domaine(s)
  • Instruments scientifiques
  • Géophysique
  • Stations, instruments et équipements météorologiques
DEF

Instrument de mesure de l'opacité ionosphérique en l'absence de perturbations ionosphériques en déterminant l'absorption de l'énergie électromagnétique émise par les sources radioélectriques cosmiques.

Spanish

Campo(s) temático(s)
  • Instrumentos científicos
  • Geofísica
  • Estaciones, instrumentos y equipos meteorológicos
DEF

Equipo para determinar la opacidad ionosférica en ausencia de perturbaciones ionosféricas, determinando la absorción de la energía electromagnética emitida por el ruido radioeléctrico cósmico extraterrestre.

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