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Intensity Conserving Spline Interpolation (ICSI): A New Tool for Spectroscopic Analysis View all abstracts by submitter

James Klimchuk   Submitted: 2015-06-29 07:03

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.

Authors: J. A. Klimchuk, S. Patsourakos, D. Tripathi
Projects: None

Publication Status: Submitted to Astrophysical Journal
Last Modified: 2015-06-29 11:54
Go to main E-Print page  An automated classification approach to ranking photospheric proxies of magnetic energy build-up  Triggering an eruptive flare by emerging flux in a solar active-region complex  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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