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Space Weather Prediction Center

Global D-Region Absorption Prediction

World map of D-region frequency degredation

North Pole South Pole

Conditions in the D-Region of the Ionosphere have a dramatic effect on High Frequency (HF) communications and Low Frequency (LF) navigation systems like Loran. The global D-Region Absorption Product depicts the D-region at high latitudes where it is driven by particles as well as low latitudes, where photons cause the prompt changes. This product merges all latitudes using appropriate displays, and is useful to customers such as commercial aviation and maritime users.

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Documentation   DRAP Log     Tabular Values    Latest X-ray Flux Plot    Latest Proton Flux Plot    Black Background

Product Description Document   Data Archive