Polar cap absorption - Polar cap absorption
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A phenomenon in which high-energy particles caused by solar flares rain down on the ionosphere in the Earth's polar caps, causing abnormal ionization and absorbing shortwave radio waves. Polar cap radio wave loss. PCA (polar-cap absorption). Source: About Shogakukan Digital Daijisen Information | Legend |
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太陽フレアに起因する高エネルギー粒子が、地球の極冠域の電離層に降り注いで異常電離を引き起こし、短波帯の電波が吸収されてしまう現象。極冠電波消失。PCA（polar-cap absorption）。
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