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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Hi everyone,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif""> You might be interested in a new tool that Spiros, Durgesh, and I have developed for analyzing spectra. It can be downloaded from http://lanl.arxiv.org/abs/1506.08102. The abstract is
below.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Hope to see many of you at Loops VII,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Jim<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">The detailed shapes of spectral line profiles provide valuable information about the emitting plasma, especially when the plasma contains an unresolved mixture of velocities, temperatures, and densities. As
a result of finite spectral resolution, the intensity measured by a spectrometer is the average intensity across a wavelength bin of non-zero size. It is assigned to the wavelength position at the center of the bin. However, the actual intensity at that discrete
position will be different if the profile is curved, as it invariably is. Standard fitting routines (spline, Gaussian, etc.) do not account for this difference, and this can result in significant errors when making sensitive measurements. Detection of asymmetries
in solar coronal emission lines is one example. Removal of line blends is another. We have developed an iterative procedure called Intensity Conserving Spline Interpolation (ICSI) that corrects for this effect. As its name implies, it conserves the observed
intensity within each wavelength bin, which ordinary fits do not. Given the rapid convergence, speed of computation, and ease of use, we suggest that ICSI be made a standard component of the processing pipeline for spectroscopic data.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">********************************************************************************<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">James A. Klimchuk<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">NASA Goddard Space Flight Center<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Solar Physics Lab, Code 671<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Bldg. 21, Rm. 158<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Greenbelt, MD 20771<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">USA<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Phone: 1-301-286-9060<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Fax: 1-301-286-7194<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">E-mail: <a href="mailto:James.A.Klimchuk@nasa.gov"><span style="color:blue">James.A.Klimchuk@nasa.gov</span></a>
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Homepage: <a href="http://science.gsfc.nasa.gov/sed/index.cfm?fuseAction=people.jumpBio&&iPhonebookId=15844">
<span style="color:blue">http://science.gsfc.nasa.gov/sed/index.cfm?fuseAction=people.jumpBio&&iPhonebookId=15844</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">No endorsement by NASA is implied for any correspondence related to my official role in professional organizations.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif""> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">********************************************************************************<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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