Below is the 3-Day X-Ray Flux plot that updates every 5 minutes.

For the GOES X-Ray Flux 6-Hour Data that updates every minute click HERE.

Information

This data is measured by two GOES satellites which monitors Solar X-Rays. This information is very important in tracking solar flares. Large X-ray bursts cause short wave fades for HF propagation paths through the sunlit hemisphere. Solar flares can also trigger geomagnetic storms which produce aurora and nice openings on VHF. Visit the Flares section for more information.

GOES SXI Website. http://sxi.ngdc.noaa.gov/index.html