The Calcium K (Ca-K) module is designed for observing the Sun in the 393.4 nm wavelength, one of the two emission lines produced by Calcium near the edge of the visible spectrum. This line originates from a slightly lower and cooler layer of the solar atmosphere than that observed in Hydrogen-alpha, revealing supergranulation cells and bright regions associated with strong magnetic activity such as sunspots and active regions.
Observing both the Calcium K and Hydrogen-alpha wavelengths provides a deeper understanding of the Sun’s structure, magnetic field strength, and the dynamics of its active regions.
This Calcium K Module is engineered exclusively for the Lunt LS130MT Universal Telescope, integrating seamlessly with its modular design. It allows the LS130MT to be configured for Ca-K solar observing or imaging with optimal performance.
The Ca-K line at 393.4 nm lies just beyond the visible spectrum on the ultraviolet side. While many observers can perceive a faint violet hue, others may find the contrast difficult to discern due to natural eye limitations. For this reason, Calcium K is most effectively studied through imaging — modern cameras capture the fine structure and intricate detail of the Sun in this wavelength with remarkable clarity.
The Lunt Ca-K Module for LS130MT includes internal narrowband filters with a <2.4 Å bandpass, delivering crisp, high-contrast solar images. This is primarily an imaging system, though experienced observers or those with enhanced UV sensitivity (such as post-cataract surgery) may enjoy limited visual observation.
