Here's another try. It should come through this time.
Leon
On 06/29/2015 01:41 PM, DeLuca, Edward wrote:
Was there suppose to be an attachment?
On Mon, Jun 29, 2015 at 1:33 PM, Leon Golub <lgolub@cfa.harvard.edu mailto:lgolub@cfa.harvard.edu> wrote:
Here's a copy of the Oktem et al. paper. Leon On 06/29/2015 01:26 PM, Klimchuk, James A. (GSFC-6710) wrote: Thanks, Charles. Another paper on this general subject that deals with spectral imaging (overlap-ograms) was recently published by Figen Oktem (Oktem et al. 2014, IEEE Trans. on Image Processing, vol. 23, no. 12, p. 5707). Unfortunately, it doesn't seem to be available on ADS. Cheers, Jim -----Original Message----- From: Charles C. Kankelborg [mailto:kankel@solar.physics.montana.edu <mailto:kankel@solar.physics.montana.edu>] Sent: Monday, June 29, 2015 12:39 PM To: Klimchuk, James A. (GSFC-6710) Cc: (Loops@solar.physics.montana.edu <mailto:Loops@solar.physics.montana.edu>) Subject: Re: [Loops] new spectroscopic analysis tool Hi Jim, This is a needed improvement. This kind of interpolation has been available for some time, but I have not see in applied to spectra (where it is probably most needed, for all the reasons you point out). Sakurai and Shin derived analytically, in closed form, a spline interpolation with rigorous photon conservation: Takashi Sakurai and Junho Shin, 2001 "Interpolation of One- and Two-Dimensional Images with Pixelwise Photon Number Conservation " http://pasj.oxfordjournals.org/content/53/2/361.full With our usual detectors (rear-illuminated CCDs) there can be significant charge spreading in the field free region, so the pixels are well defined (in effect, they are fuzzy and overlapping). A proper flux-conserving interpolation scheme should take that into account. To my knowledge, that has not been done. Best regards, Charles On 2015 Jun 29, , at 6:59 AM, Klimchuk, James A. (GSFC-6710) <james.a.klimchuk@nasa.gov <mailto:james.a.klimchuk@nasa.gov>> wrote: Hi everyone, You might be interested in a new tool that Spiros, Durgesh, and I have developed for analyzing spectra. It can be downloaded fromhttp://lanl.arxiv.org/abs/1506.08102 <http://lanl.arxiv.org/abs/1506.08102>. The abstract is below. Hope to see many of you at Loops VII, Jim The detailed shapes of spectral line profiles provide valuable information about the emitting plasma, especially when the plasma contains an unresolvedline 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. ******************************************************************************** James A. Klimchuk NASA Goddard Space Flight Center Solar Physics Lab, Code 671 Bldg. 21, Rm. 158 Greenbelt, MD 20771 USA Phone: 1-301-286-9060 <tel:1-301-286-9060> Fax: 1-301-286-7194 <tel:1-301-286-7194> E-mail: James.A.Klimchuk@nasa.gov <mailto:James.A.Klimchuk@nasa.gov> Homepage: http://science.gsfc.nasa.gov/sed/index.cfm?fuseAction=people.jumpBio&&iPhonebo okId=15844 No endorsement by NASA is implied for any correspondence related to my official role in professional organizations. ******************************************************************************** _______________________________________________ Loops mailing list Loops@solar.physics.montana.edu <mailto:Loops@solar.physics.montana.edu> https://mithra.physics.montana.edu/mailman/listinfo/loops ___________________________________________________________________ _____ Charles Kankelborg AC7NY | 260C EPS Building | Physics Department | "We can lick gravity, but sometimes the Montana State University | paperwork is overwhelming." Bozeman, MT 59717 | Phone: 406-994-7853 <tel:406-994-7853> | --Wernher von Braun FAX: 406-994-4452 <tel:406-994-4452> | http://solar.physics.montana.edu/kankel/ _______________________________________________ Loops mailing list Loops@solar.physics.montana.edu <mailto:Loops@solar.physics.montana.edu> https://mithra.physics.montana.edu/mailman/listinfo/loops -- ______________________________________________________________________________ Leon Golub, Senior Astrophysicist Smithsonian Astrophysical Observatory 60 Garden Street Cambridge, MA 02138 617 495 7177 <tel:617%20495%207177> FAX 496 7577 lgolub@cfa.harvard.edu <mailto:lgolub@cfa.harvard.edu> ______________________________________________________________________________ This communication may contain information subject to United States export control regulation under either the International Traffic in Arms Regulations (ITAR), 22 CFR Parts 120-130, of the United States Department of State, the Export Administration Regulations (EAR), 15 CFR Part 730-799, of the United States Department of Commerce, or both. Export of this information to foreign persons, entities, or countries is subject to prior license or exemption by the applicable agency.
-- Edward DeLuca Senior Scientist Harvard-Smithsonian Center for Astrophysics 617-496-7725