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
复制标题
极紫外成像望远镜极板刻度的飞行测定
DOI：
10.1086/312471
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
G. Artzner
中科院分区：
文献类型：
--
作者：
F. Auchère;C. Deforest;G. Artzner
利用太阳和日光层观测航天器上的迈克尔逊多普勒成像仪和极紫外成像望远镜（EIT）的同时观测，我们在飞行中确定了极紫外成像望远镜的板尺。结果是2。″629±0。″001像素-1，与2。″627±0。″001从最近的实验室焦距测量中推断出的像素-1值，比2高7 σ。″飞行前标定的622像素-1值。发现平板尺度在整个视场中是恒定的，证实了EIT理论模型预测的可忽略的畸变水平。此外，我们的结果与最新的实验室测量值之间的2 σ差异虽然统计上很小，但可以证实最近的一项工作，即太阳光球半径可能比经典采用的值695.99 Mm低0.5 Mm。
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.