D Region Absorption Predictions (D-RAP)

Conditions in the D region of the ionosphere have a dramatic effect on high frequency (HF) communications and low frequency (LF) navigation systems. The global D Region Absorption Predictions (D-RAP) 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 from a broad base that includes emergency management, aviation and maritime users. [more]

Specific Absorption Frequencies
thumbnail of global absorption predictions at 1 dB
thumbnail of North polar absorption predictions at 10 dB thumbnail of South polar absorption predictions at 10 dB
thumbnail of global absorption predictions at 5 MHz thumbnail of North polar absorption predictions at 5 MHz thumbnail of South polar absorption predictions at 5 MHz
thumbnail of global absorption predictions at 10 MHz thumbnail of North polar absorption predictions at 10 MHz thumbnail of South polar absorption predictions at 10 MHz
thumbnail of global absorption predictions at 15 MHz thumbnail of North polar absorption predictions at 15 MHz thumbnail of South polar absorption predictions at 15 MHz
thumbnail of global absorption predictions at 20 MHz thumbnail of North polar absorption predictions at 20 MHz thumbnail of South polar absorption predictions at 20 MHz
thumbnail of global absorption predictions at 25 MHz thumbnail of North polar absorption predictions at 25 MHz thumbnail of South polar absorption predictions at 25 MHz
thumbnail of global absorption predictions at 30 MHz thumbnail of North polar absorption predictions at 30 MHz thumbnail of South polar absorption predictions at 30 MHz