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Coronal magnetograms: magnetograms at the base of the
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corona
(wherever that is)
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Coronal temperature maps: possible wherever the corona is
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optically
thick, i.e., every active region (relevant for flare
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studies).
Use maximum T at any frequency in each pixel.
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Coronal magnetic shear maps: essentially difference between
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coronal
magnetogram and potential field extrapolation of
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photospheric
fields. Potentially
valuable for flare prediction.
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Emerging coronal flux: indicates regions of rapid changes of
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flux
entering the corona
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Eventually:
3D coronal
magnetograms in
conjunction with
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nonlinear
force-free extrapolations of surface fields
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