NOAA / Space Weather Prediction Center
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October 19, 2009 -- This product has been approved to become an official NWS product. It will replace the currently operational D-Region Absorption product on November 18, 2009. At that point, the old product will be decommissioned and will no longer be available.
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. Note that at solar minimum, events are relatively rare and the map can remain colorless for months.
Documentation Tabular Values Latest X-ray Flux Plot Latest Proton Flux Plot Black Background
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