This page (revision-57) was last changed on 07-Dec-2016 14:14 by David R Williams

This page was created on 09-Jul-2008 07:16 by David R Williams

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At line 108 removed 2 lines
If ''n'' is the number of positions that the slit makes an image at, Σ ''t%%sub exp%%'' is the sum of the exposure times (usually there is only one) at each position (in seconds), and ''x%%sub step%%'' is the size (in arcseconds) of the step, then it takes ''n'' × Σ ''t%%sub exp%%'' × ''x%%sub step%%'' seconds to build up a spatial image of an area that is ''n'' × ''x%%sub step%%'' arcseconds across.
At line 113 changed one line
''a.k.a. SLA — SLit/slot Assembly''
''a.k.a. SLA — SLit/slot Assembly''\\
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%%zebra-table
%%sortable
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%%
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Whereas the width of each spectral window can vary (see Line Lists below), the height of the image ''y%%sub size%%'' read out from the CCDs is necessarily fixed for each window. So each raster has the same height in all spectral windows. This height is expressed in arcseconds.
At line 147 added 2 lines
''Scanning raster-specific''\\
This is a little confusing, but it tells you the number of times ''N'' that the mirror must move between observations to build up a scanning raster, i.e. 1 less than the number of positions at which EIS makes an exposure.
At line 150 added 6 lines
__Working out the size of a raster__\\
If ''N+1'' is the number of positions at which the slit makes an image, Σ ''t%%sub exp%%'' is the sum of the exposure times (usually there is only one) at each position (in seconds), and ''x%%sub step%%'' is the size (in arcseconds) of the step, then it takes ''n'' × Σ ''t%%sub exp%%'' × ''x%%sub step%%'' seconds to build up a spatial image of an area that is ''x%%sub size%%'' = ( (''n'' × ''x%%sub step%%'') + SlitSize ) arcseconds across.
Putting this together with the ''x%%sub size%%'', worked out above, tells you the spatial extent of the observation that this raster produces.
This page (revision-57) was last changed on 07-Dec-2016 14:14 by David R WilliamsTop