Hydrogen Alpha Filters

Calcium Filters

Sodium D Filters

Energy Rejection Filters

DayStar is proud to offer Sodium Na- D line (5895.9Å ) filtering systems. For visual and photographic studies.  Sodium filter assemblies are designed for sub-angstrom observations with single-cavity design. Sodium lines are very narrow, but very bright. A very narrow filter of < 0.5Å is necessary to properly isolate the line from the continuum. The resulting image depicts high detail in granulation, supergranulation and P-modes.

Sodium also shows impulsive-phase flare eruption kernels. Na D is a low excitation line emitted when the low chromosphere is heated, usually at footpoints of flux loops passing through a flare, as sodium D line reflects the lower chromosphere. Visual and photographic images reveal type image as Calcium, revealing granulation, but are much brighter and more easily visible.

Mount Wilson Solar Observatory

These filters have until now been primarily used for research purposes only, performing doppler and supergranulation studies. Narrow bandpass Na D line filters have also been used in deep-sky observations of IO, but with significantly larger apertures.

	0.4Å Single cavity Amateur T-Scanner filter system $3400.00 - suitable for visual or photographic observing
	0.4Å Single cavity University series filter system $4800.00 - suitible for photographic and visual observing