DayStar Filters CALCIUM QUARK Manuale - Pagina 8

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About Seeing Limitations and Resolution:

Solar observing seeing conditions vary greatly from nighttime conditions.

During the daytime, radiant heating from the sun affects seeing

significantly. Characterized by turbulence or shimmering as seen over a

hot street, seeing can cause significant impact on quality of solar

observations.

- Bad seeing is caused by air of different temperatures mixing. This

typically happens within the lowest 10 feet of air. It occurs most often

over

pavement,

dark

objects,

rooftops

and

sometimes

trees.

- High cirrus clouds or "scuzz" will cause scattering of sunlight in the high

atmosphere which often makes for bad viewing conditions. A classic

sign of high cirrus clouds is the inability to achieve focus, or the need to

"chase focus", or a lack of contrast. Calcium is particularly susceptible to

poor transparency.

- A jet-stream moving overhead can also hurt seeing conditions even on

a clear day.

DayStar Filters are high power viewing platforms and this high resolution

can be susceptible to seeing issues. Solar Observers using high

powered, high resolution telescopes and DayStar filters should heed

daytime seeing. While many of these conditions are beyond our control,

observing in an area with ideal conditions, without pavement in the

direction of viewing, and on days with no high cirrus will offer best

results. Grass is the best environment for daytime seeing stability.

Each observing location offers different behavior for daytime seeing cells

at different times of the day, as the air through which one views changes

with movement of the sun. Some locations benefit from best seeing in

the morning, while many have best seeing in the afternoon. Because

most heat variation between air and ground surfaces occurs within the

first 10 feet above the ground, often a high observing platform will offer

superior seeing. This might include a second story deck which overlooks

grass.

Solar Imaging Tips:

Daystar recommends MONOCHROME CCD imaging whenever

possible for best results. The recent availability of CCD cameras and

DSLR cameras has offered a simple opportunity for solar observers to

image the Sun in Hydrogen Alpha or Calcium with a Digital SLR camera.