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SkywaveShortwave radiationGround waveMaximum usable frequencyRadio waveRadio telescopeSolar radio emissionAtmospheric noise160-meter bandIonosphereAtmospheric refraction20-meter band10-meter bandSporadic e propagationTv and fm dxOutgoing longwave radiationRadio occultationDiffuse sky radiation15-meter bandAtmospheric windowAntenna tracking systemCommunications satellite6-meter bandAstronomical radio sourceLongwaveMolniya orbitHorizonRadio spectrumClear-channel stationOver-the-horizon radarRadar horizonRadio astronomyMain lobeLight pillarSatellite televisionHorizontal coordinate systemPrimary radarLoran-cRadio galaxy40-meter bandSolar irradianceAtmospheric lidarBaade's windowAstrophysical maserSchumann resonancesSunbeamGround track1.2-centimeter bandGps signalsThermosphereSpace networkOptical window70-centimeter bandInfraredGravitational waveK bandMesocycloneSkyglowInfrared windowBirkeland currentL bandAir massMagnetosphereExtremely low frequencyElectrojetGnss reflectometry23-centimeter bandEarth's shadowMagnetic dipMirageBand iiiRadiation zone630-meter bandCivil twilight4-meter bandRayleigh sky modelSolar windPhase angleSolar phenomenaFootprintDecouplingSolar flareSpace-based radarSunlightMeridian arcMeridianMedium earth orbitSatellite laser rangingSky brightnessLatitudeLight2-meter bandSolar constantEarth's magnetic fieldCosmic noiseIonosondeTwilightSatellite internet accessIridium satellite constellationTerrestrial gamma-ray flash