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Radio spectrum40-meter band160-meter band20-meter band70-centimeter band33-centimeter bandK band4-meter bandRadio wave23-centimeter band6-meter band15-meter band630-meter bandS band10-meter bandBand iii1.2-centimeter band2200-meter band1.25-meter bandShortwave radiation80-meter bandInfraredLightLongwave2-meter bandExtremely low frequencySchumann resonancesRadio astronomySunlightC bandOutgoing longwave radiationMaximum usable frequencyFar infraredTerahertz radiationIonosphereSolar radio emissionRadio telescopeL bandSubmillimetre astronomySolar irradianceMain lobeSkywaveSoret peakAtmospheric windowBlue laserAstrophysical maserCommunications satelliteIridium satellite constellationNear vertical incidence skywaveGps signalsCosmic microwave backgroundGround waveSunshineSporadic e propagationInfrared windowOzone layerOptical windowThermosphereFar-redAntenna tracking systemAstronomical radio sourceSatellite televisionSolar constantRadio occultationFootprintRadio galaxyPrimary radarElectrojet780 amSatellite internet accessJames clerk maxwell telescopeCyclotron radiationAstronomical spectroscopyAtmospheric temperatureInfrared astronomyOuter spaceAmateur radio satelliteLaser communication in spaceMagnetosphereLatitudeCosmic noiseClear-channel stationEvent horizon telescopeSpace-based radarFast radio burstNorthern celestial hemisphereSatellite internet constellationLoran-cSouthern celestial hemisphereGeosynchronous satelliteOdd radio circleDiffuse sky radiationHydrogen lineSatellite data systemMedium earth orbitEquatorial coordinate systemAtmospheric noiseEarth's magnetic fieldCassiopeia aRotating radio transient