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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EisXstudy
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At line 75 changed one line
!Raster Details
!Viewing raster details
At line 83 added one line
The upper panel here shows the key information that we need to know about to describe the raster, namely:
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||Parameter Name||value
|Title| ''to be discussed later''
|Author|Peter Young
|Raster Type|Scanning
|Slit/Slot|2"
|Compression|DPCM
|Window Height|200 pixels
|Number of Raster Pointings|34
|FM Step Size|2.0"
|Number of Exposures/step|1
|Exposure time(s) in seconds|100.0
|Delay times (ms)|0.0
At line 98 added one line
So, what to do with all this information? Let's put it in context.
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''Author''
The author of this ''raster'' is Peter Young. Fairly easy
''Raster Type''
The term [raster|http://en.wikipedia.org/wiki/Raster_graphics] usually conjures up the idea of a rectangular image. And that's what EIS does when it makes its observations. It's just that in some cases the ''X'' dimension is time, rather than space.
EIS has two modes of raster. The first is ''scanning'' raster, which is what we see in this example. EIS takes a restricted-field image of the Sun and then disperses it, perpendicular to the length of the slit. Then, a fine mirror (FMIR) adjusts the X position on the Sun where that image comes from (by the amount indicated in ''FM Step size'') and makes another image.
The second mode is the so-called ''fixed slit'' or ''sit'n'stare'' raster type, whereby the
This tells you whether this is a fixed-position observation.
This page (revision-57) was last changed on 07-Dec-2016 14:14 by David R WilliamsTop