This page (revision-12) was last changed on 07-Dec-2016 14:14 by David R Williams

This page was created on 09-Jul-2007 12:35 by JianSun

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Page revision history

Version Date Modified Size Author Changes ... Change note
12 07-Dec-2016 14:14 2 KB David R Williams to previous Took out the discussion about FWHM versus natural width because it was confusing. Result now summarised.
11 22-Jan-2009 05:36 4 KB David R Williams to previous | to last Reply to comment by Celine Boutry, and correction to the description of the instrumental width.
10 21-Jan-2009 15:12 3 KB CelineBoutry to previous | to last
9 21-Jan-2009 09:00 2 KB David R Williams to previous | to last
8 21-Jan-2009 09:00 2 KB David R Williams to previous | to last
7 21-Jan-2009 08:59 2 KB David R Williams to previous | to last
6 21-Jan-2009 08:58 2 KB David R Williams to previous | to last Response to Celine Boutry's question about the instrumental width.
5 21-Jan-2009 08:47 2 KB David R Williams to previous | to last
4 16-Jan-2009 15:36 1 KB CelineBoutry to previous | to last instrumental width
3 09-Jul-2007 13:00 955 bytes Louise Harra to previous | to last
2 09-Jul-2007 12:36 1 KB JianSun to previous | to last
1 09-Jul-2007 12:35 1 KB JianSun to last

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InstrumentalWidthOfEIS...nobody
InstrumentalWidthOfEIS

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At line 1 added 2 lines
[{ALLOW edit EISMainUsers}]
[{ALLOW view Anonymous}]
At line 12 added one line
In response to your first query - do you get the same shift (and what is it) if you got with a simple gauss_fit?
At line 11 changed 7 lines
* Line_width_variation_studies_by_EIS?
Secondly, can we get the accurate width variation ? , and can we use these datas for line-width variation studies ?
–A.K. Srivastava, 02-July-2007
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In response to your query we would need more information. Various work has been carried on line widths looking at the differences
In response to your second query we would need more information. Various work has been carried on line widths looking at the differences
At line 19 added 24 lines
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About the instrumental width, [Doschek et al 2007|http://adsabs.harvard.edu/abs/2007ApJ...667L.109D] proposed a FWHM of 2.5 pixels (i.e. 56 mA) in orbit given that the FWHM is 1.956 pixels in laboratory and [Brown et al. 2008|http://adsabs.harvard.edu/abs/2008ApJS..176..511B] give us between 54mA and 57mA depending on the wave band and the wavelength.\\
Is there any instrumental profile available?\\
Is it a Gaussian profile? What is the width commonly used ?\\
--[Celine Boutry], 16-Jan-2009
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Hi Céline,
I think the answer may be in your question, actually.
The Doschek ''et al.'' article states a single number, but that is based on comparisons with older data. However, it is still consistent with the numbers derived from comparing the pre-launch laboratory EIS calibration data with the on-orbit EIS data by Brown ''et al.'' (2008). The Brown ''et al.'' numbers are inferred widths, but the reasoning is pretty logical; the fact that the Doschek ''et al.'' (2007) number falls within that range of 0.054 — 0.057 Å is comforting.
In summary, Brown ''et al.'' (2008) assume a Gaussian instrumental line profile, and they infer an instrumental width of 0.054 Å in the short-wavelength channel (170 — 210 Å) and 0.057 Å for the long-wavelength channel (250 — 290 Å).
__NOTE!__ As Céline Boutry points out, this is the FWHM of the instrumental width (not the Gaussian width σ as previously incorrectly stated here).
--[Dave Williams|DavidRWilliams], 17-Jan-2009
This page (revision-12) was last changed on 07-Dec-2016 14:14 by David R WilliamsTop