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

F. Auchère | Zendy; C. E. DeForest | Zendy; G. Artzner | Zendy

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

Author(s) -

F. Auchère,

C. E. DeForest,

G. Artzner

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/312471

Subject(s) - physics , telescope , field of view , observatory , extreme ultraviolet , solar telescope , pixel , optical telescope , optics , radius , solar observatory , ultraviolet astronomy , spacecraft , astrophysics , astronomy , distortion (music) , on board , doppler effect , remote sensing , spectral line , magnetic field , astronomical spectroscopy , cmos , amplifier , laser , computer security , optoelectronics , computer science , geology , quantum mechanics

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&farcs;629+/-0&farcs;001 pixel-1, in fair agreement with the 2&farcs;627+/-0&farcs;001 pixel-1 value deduced from recent laboratory measurements of the focal length and much higher by 7 sigma than the 2&farcs;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 sigma 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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