Sunny days and the sun shows several sunspots and
prominences. The images were taken with Ha and CaK filters, different
wavelengths.
A CaK filter (Calcium K-line filter) is a specialized solar
filter for telescopes that isolates light at a specific wavelength of 393.3 nm
in the deep violet/near ultraviolet (UV) spectrum. The filter is used in
astronomy to observe and photograph the sun, as it makes the lower chromosphere
and the border region with the photosphere visible.
H-alpha solar filterH-alpha solar filterA H-alpha
(Hydrogen-alpha) solar filter is a specialized and advanced optical system that
isolates an extremely narrow light wavelength of 656.28 nanometers (nm), which
makes it possible to safely observe the sun's chromosphere. Unlike regular
white light solar filters, an H-alpha solar filter shows dramatic details such
as prominences (gas clouds ejected from the edge), filaments, sunspots and
solar flares.
