On the need for space observations of the umbra/photosphere intensity ratio

Details On the need for space observations of the umbra/photosphere intensity ratio On the need for space observations of the umbra/photosphere intensity ratio

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...74..147a&link_type=abstract

(ESA and European Physical Society, ESLAB Symposium on Physics of Solar Variations, 14th, Scheveningen, Netherlands, Sept. 16-19

Astronomy and Astrophysics

Astronomy

8

Luminous Intensity, Photosphere, Spaceborne Astronomy, Sunspots, Umbras, Calibrating, Inhomogeneity, Space Observations (From Earth), Telescopes

Scientific paper

Attention is drawn to the possibility of distinguishing between different sunspot theories by observing: (1) The umbra/photosphere intensity ratio as a function of spot size and (2) the morphology and time evolution of sunspot inhomogeneities such as umbral dots. In arguing the need for space observations of sunspot intensities, the corrections for stray light for ground based and space observations are discussed. The opportunity to use the November 13, 1986 Mercury transit as an in situ calibration event is pointed out.

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