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Sodium Na D-line Filters

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Sodium Na D-line Filters

DayStar is proud to offer Sodium Na- D line (5895.9 ) 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 < 0.5 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
University series filters are designed to operate unheated on the lower of the two Na D emission lines; and can be heated to accomplish transmission on the higher of the two Na D lines, making doppler studies possible by photographing in each line and derriving difference images after subtracting an average solar velocity image. This process is referred to as a dopplergram velocity image, reveals the surface motions associated with supergranulation.

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.

DayStar Sodium Filter assemblies
0.4 Single cavity Amateur T-Scanner filter system $4500.00
- suitable for visual or photographic observing
0.4 Single cavity University series filter system $7200.00
- suitible for photographic and visual observing

* Note. These systems require an energy rejection pre-filter and F/30 focal ratio for onband operation.  Standard yellow glass DayStar Energy rejection filters provide sufficient off-band energy rejection, as do dielectric 'hot mirror' coated pre-filters.





Photo by Greg Swaim
DayStar Filters 0.4 Sodium D line filter
Short lived solar flare flashes in Na D line:
Photo by Greg Swaim
DayStar Filters 0.4 Sodium D line filter


SoDline

Click to enlarge0.4 Single cavity Amateur Sodium series filter

- suitable for visual or photographic observing


Availability: Usually ships the next business day

SodAmateur$4,500.00
Click to enlarge0.4 Single cavity University Sodium series filter

- suitible for photographic and visual observing


Availability: Usually ships the next business day

SodUniv$7,200.00
Energy Rejection FiltersEnergy Rejection FiltersEnergy Rejection Filters reduce the heat load on your filter assembly by absorbing or reflecting UV and/or I light and transmitting light in the desired visual spectrum. These filters are sometimes Red or Yellow glass, or dielectric IR and UV, but pass light in the desired visual spectrum. The ERF can also serve as an aperture mask to accomplish a straight angle of incidence for light entering the filter...

EnReFilt





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