The National Geophysical Data Center (NGDC) archives histograms of intensity versus area every minute for the active regions.
[2] The SOON observatories are operated by detachments of AFWA's 2nd Weather Group at the following sites:[1] Telescopes at Palehua, Hawaii and Ramey Air Force Base, Puerto Rico have been shut down.
The CRA also develops maintenance procedures, institutes physical (non-software) updates, and overhauls all three telescopes on a regular basis.
It has a tunable monochromatic filter centered on the hydrogen-alpha absorption line at 6,562.8 ångströms (656.28 nanometers) in the Sun's light spectrum.
Shifting the filter's characteristics slightly away from the center of the H-alpha peak results in pictures of the solar surface region at differing depths.