Soft X-ray image in the titanium-polyimide ("Ti_poly") filter from the Hinode X-Ray Telescope (XRT)

SOHO - Solar and Heliospheric Observatory is a joint project between the European Space Agency (ESA) and American National Aeronautics and Space Administration (NASA) EIT - Extreme ultraviolet Imaging Telescope aboard SOHO which obtains images of the Sun at ultraviolet wavelengths. The EIT/ SOHO is able to image the solar transition region and inner corona in several, selected bandpasses in the extreme ultraviolet (EUV).
The best bandpass to coronal holes view is Fe XV 284 A = 2 000 000 K .
Dark regions are coronal holes where the fastest solar wind originates.

He II 304 A = 60 000 - 80 000 K
The best bandpass to prominences view.

X-ray Flux, Solar Flares and Radio Blackouts.

Solar X-ray Flux.
This plot shows 3-days of 5-minute solar x-ray flux values measured on the GOES 10 satellite.

See D-region Absorption Documentation on Space Environment Center for more details and D-region Absorption page for affects of solar x-rays.

High energy proton flux (>10MeV) and Solar Radiation Storms.

Geomagnetic Field and Geomagnetic Storms.

Kp maps of midnight equatorward boundaries

NW NE

SW SE