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Collection includes a variety of solar photographic and illustrated datasets contributed
by a number of national and private solar observatories located worldwide. Daily solar
observations range from the mid 1800's to the present. White-light photographs of
the solar disk and limb reveal features on and near the photospheric disk including
active regions and sunspots. Solar observations viewed at specific wavelengths, including
hydrogen-alpha (656.3 nm), calcium-K (393.3 nm), iron and radio frequencies, reveal
the structure and dynamics of chromospheric features, including plague, filaments
and prominences, and the extended corona. Composite full-sun drawings, prepared by
professional staff at various observatories, provide a daily synoptic perspective
of solar features that can be tracked from day to day.
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