Computer Science – Performance
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.1804s&link_type=abstract
American Astronomical Society, SPD meeting #40, #18.04; Bulletin of the American Astronomical Society, Vol. 41, p.844
Computer Science
Performance
Scientific paper
The X-Ray Telescope (XRT) aboard Hinode has observed a variety of coronal structures in the range of 34x34 arc min field-of-view (FOV) covering the full solar disk. In general, most astronomical telescopes are designed such that the best-focused image of an object can be achieved at or close to the on-axis position, and the optical performance varies systematically across the FOV. The Sun is, however, a large object whose size is about 30 arc min and coronal structures are observed not only at the disc center but also near the limb. For this reason, the optical structure of solar telescopes should be designed with care for improving the uniformity of the angular resolution over the full FOV. Since there is no unique solution for successfully implementing this kind of off-axis variation, the optical properties of the XRT have been examined using the data from the ground experiments as well as from in-flight observations for the calibration of systematic variations in the FOV.
The vignetting effect is an important optical characteristic for describing the performance of the telescope, which reflects the ability to collect incoming light at different locations and different photon energies. Especially, the determination of this vignetting effect is one of the essential calibration steps that should be performed before the observed images are used for any scientific purposes. Because a component of the XRT vignetting effect shows a wavelength dependence, special care should be taken when, for example, performing temperature analyses with thin and thick filters of flares occurring near the solar limb. In this presentation, we introduce the results of analysis of pre-launch calibration data obtained from MSFC/XRCF experiments. The two-dimensional off-axis variation of the XRT point spread function (PSF) and its energy dependence will be discussed in detail.
DeLuca Edward E.
Golub Leon
Martens Petrus C. H.
Shin Junho
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