polar-cap absorption

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polar-cap absorption [′pō·lər ‚kap əb‚sȯrp·shən]

(geophysics)

Very strong attenuation of radio waves over the polar regions during strong solar flares, due to extremely heavy ionization of the upper atmosphere. Abbreviated PCA.

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polar triangle
polar trough
polar variation
polar vector
polar vortex
polar wandering
polar westerlies
polar-cap absorption
polar-cap ice
polar-class icebreaker
polar-coordinate navigation system
polar-easterlies index
polar-front theory
polar-reciprocal curves
polar-reciprocal triangles

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