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Here is a comparison of SEM and GOES X-ray data for a randomly chosen, moderately active day (15 May 2001). A selected list of solar X-ray events observed by CELIAS/SEM (15 second averages) 21 Nov 2012 (DOY 326 1510 UT) M3.5 x-ray flare in AR1618 leading to a shock 54 hours later on 23 Nov 2012 (DOY 328) at 2122 UT.
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 ]
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