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         title="Permalink to Research idea: NIR variation">Research idea:  NIR variation</a></h2>
 
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    <abbr class="published" title="2012-09-20T20:07:00-06:00">
      2012/09/20
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    <address class="vcard author">
      By <a class="url fn" href="https://keflavich.github.io/blog/author/adam-keflavichgmailcom.html">Adam (keflavich@gmail.com)</a>
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    <p><a class="reference external" href="http://www.adamgginsburg.com/index.htm">I</a>&nbsp;really want to know how near-infrared absorption lines correlate
with emission lines; understanding this is essential for near infrared
calibration.</p>
<img alt="" src="http://3.bp.blogspot.com/-g_ixmCtNH6c/UEbiTCymILI/AAAAAAAAHNc/WabU1JlWoVo/s320/nightskycorrelation_test.png" />
<p>The emission lines correlate reasonably well, but not perfectly. &nbsp;There
are models out there of how these should behave, but they seem to be
proprietary and non-free so I have no interest in them - I won't pay
before I know they work, and I can't test them.
But perhaps more careful measurements of the night sky lines could
provide some information about the absorption, particularly in the
Brackett-delta and Brackett-epsilon region we've been interested in
lately.
I'm pretty sure the change in slope observed above is from observing at
different airmasses (2.3 vs 1.05)</p>

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