Calcium K Solar Filters
Discovered in the early 1800's,
the K-line of calcium was included in Joseph Fraunhofer's
drawing and given it's name in the middle of the nineteenth century.
Though its pair of spectral
lines, H and K, are stronger than hydrogen's visible-light spectral
lines, calcium makes up only 0.008 percent of the sun's mass,
compared with hydrogen's 90 percent. The K line is from calcium ions
(ions missing one electron each)
that emit and absorb energy in the ultraviolet portion of the solar
spectrum in a broad region centered at 393.3 nm (3933 Å).
What is CaK? |
Supergranules |
CaK filters |
CaK Resources |
