In-Flight Determination of the Plate Scale of the Extreme-Ultraviolet Imaging Telescope

Details In-Flight Determination of the Plate Scale of the Extreme-Ultraviolet Imaging Telescope In-Flight Determination of the Plate Scale of the Extreme-Ultraviolet Imaging Telescope

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...529l.115a&link_type=abstract

The Astrophysical Journal, Volume 529, Issue 2, pp. L115-L117.

Astronomy and Astrophysics

Astronomy

6

Instrumentation: Miscellaneous, Sun: Fundamental Parameters

Scientific paper

Using simultaneous observations of the Michelson Doppler Imager and Extreme-Ultraviolet Imaging Telescope (EIT) on board the Solar and Heliospheric Observatory spacecraft, we determined in flight the plate scale of the EIT. We found a value of 2.629"+/-0.001" pixel-1, in fair agreement with the 2.627"+/-0.001" pixel-1 value deduced from recent laboratory measurements of the focal length and much higher by 7 σ than the 2.622" pixel-1 value of the preflight calibrations. The plate scale is found to be constant across the field of view, confirming the negligible distortion level predicted by the theoretical models of the EIT. Furthermore, the 2 σ difference between our results and the latest laboratory measurements, although statistically small, may confirm a recent work suggesting that the solar photospheric radius may be 0.5 Mm lower than the classically adopted value of 695.99 Mm.

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