Lunt Calcium K ModuleCalcium K Module Calcium K (Ca K) telescopes and filters are used to study the wavelength of 393. 4 nm. This emission line is one of two that are produced by Calcium just at the edge of the visible spectrum. Comparatively, this is in a layer that is slightly lower and cooler than the layer viewed in Hydrogen alpha. The emission line displays areas of super granulation cells that are brightest and strongest in areas of high magnetic fields, such as
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