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Calcium-K
Go deeper into the
chromosphere of the sun and discover the cooler parts. This spectral
line shows the chromospheric network of ionized calcium emissions that
are created when supergranulation cells sweep through magnetic fields
where they collect and strengthen.
In this spectral line you will be able to study plages, active areas and
magnetic storms. But be aware that only with a 10Å
visual observation is possible. For imaging the 2Å
filters are being used.
Plage
Patchy H-Alpha brightening on the solar disk, usually found in or near
active regions, which can last for several days. Plage is irregular in
shape and variable in brightness, marking areas of nearly vertical
emerging of reconnecting magnetic field lines.
Sunspots
Moderate to large spots usually consist of a darker central region (umbra)
and a lighter halo consisting of many short fine fibrils (prenumbra).
Granulation
Convective cell structures also visible in white light ("rice grains").
Each cell consists of a brighter polygonal area of hot rising gas
typically about 1100 km across, and a cooler edge or "channel" of
descending gas about 230 km wide.
Active Region
A localized, transient volume of the solar atmosphere with plages,
sunspots and flares. Active regions are the result of enhanced magnetic
fields and appear darker than the surrounding areas with roughly
circular shape.
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