From the NOAA / Space Weather Prediction Center - Use this information to help plan and troubleshoot communications, especially HF.
Clocks
Link to the following page : Click here http://www.swpc.noaa.gov/alerts/warnings_timeline.html
Link to the following page : Click here http://www.swpc.noaa.gov/alerts/alerts_timeline.html
Link to the following page : Click here http://www.swpc.noaa.gov/alerts/timeline_desc.html