兆赫茲波是介於微波波段的終點與紅外線波段的起點之間.兆赫茲輻射被大氣層強烈的吸收,限制了通信距離。這個圖包含了兆赫茲頻譜的低頻部分,從0.3到1 THz。Shown is the zenith atmospheric transmission of electromagnetic radiation from space to the summit of Mauna Kea, assuming a precipitable water vapor level of 0.001 mm (simulated). The downward spikes in the graph correspond to strong absorption lines due to various absorbances of different atmospheric molecules這個圖補充上圖,顯示大氣層傳輸兆赫茲頻譜的高頻部分,從1到3 THz。Shown is the zenith atmospheric attenuation of the electromagnetic spectrum from space to the summit of Mauna Kea, assuming a precipitable water vapor level of 0.001 mm (simulated). The decreasing transmission with increasing frequency, indicates greater absorption
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