[Loops] new spectroscopic analysis tool

[Leon Golub]

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 at solar.physics.montana.edu]
>> Sent: Monday, June 29, 2015 12:39 PM
>> To: Klimchuk, James A. (GSFC-6710)
>> Cc: (Loops at 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 at 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.  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
>>>
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>>>
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>>>
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>>>
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>>>
>>>
>>>
>>> Phone:  1-301-286-9060
>>>
>>> Fax:      1-301-286-7194
>>>
>>> E-mail:  James.A.Klimchuk at 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.
>>>
>>>
>>>
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>>>
>>>
>>>
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>> ___________________________________________________________________
>> _____
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>
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-- 
______________________________________________________________________________
Leon Golub, Senior Astrophysicist
Smithsonian Astrophysical Observatory
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Cambridge, MA 02138
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lgolub at cfa.harvard.edu
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