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Дата изменения: Fri May 24 22:15:45 2013 Дата индексирования: Mon Apr 11 16:37:39 2016 Кодировка: Поисковые слова: annular solar eclipse |
Space Telescope Science Institute |
Cycle 21 Phase II Proposal Instructions |
help@stsci.edu |
11.4.1 Spectral Elements for WFC
Hα Hα ramp Hα ramp Hα ramp The polarizers must be used with another spectral element. This is required to maintain focus. The UV polarizers (POL0UV, POL60UV, POL120UV) must be used with a spectral element on wheel 2 except for: POL0V, POL60V, POL120V, and any inner or outer ramp filter segment (see Table 11.4). The visible polarizers (POL0V, POL60V, POL120V) must be used with a spectral element on wheel 1 except for: F850LP, F892N, POL0UV, POL60UV, and POL120UV.Only a subset of possible combinations of spectral elements are permitted. In the following tables, an "S" indicates combinations that are supported. Combinations marked with "O" are permitted ONLY for Mode = ACQ exposures and are intended for use with bright targets.Table 11.3: Permitted WFC filter combinations for Mode = ACCUM
Table 11.4: Wavelength Ranges for the WFCRamp Filters
11.4.4 Spectral Elements for ACS/SBC
MgF2 CaF2 BaF2 Ly-α CaF2 PRISM LiF2 PRISM
Allowed Spectral Elements1 full frame2
F = normal WFC filters and G800L
S = small elements (polarizers and F892N)
I = inner ramp filter segments
M = middle ramp filter segments
O = outer ramp filter segments
A subarray fixed by STScI will apply to WFC, WFC1, WFC2 when a small spectral element (polarizer of F892N) is selected.