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{{Use dmy dates|date=September 2019}}
{{Use Indian English|date=September 2019}}
[[File:Thekaekara Spectrum.png|thumb|right|Plot of Thekaekara Spectrum]]
'''Matthew Pothen Thekaekara''' (1914–1974) was an Indian scientist and author of books and papers relating to [[spectrophotometry]] and the [[solar constant]]<ref name="crescentmeadow1">{{cite web |url=http://www.crescentmeadow.com/perma/biblio/solar_energy.html |title=Solar Energy |publisher=Crescentmeadow.com |access-date=2013-09-28 |url-status=dead |archive-url=https://web.archive.org/web/20010123062700/http://www.crescentmeadow.com/perma/biblio/solar_energy.html |archive-date=2001-01-23 }}</ref> besides works on [[theology]].<ref name="georgetown1">{{cite web|url=http://catalog.library.georgetown.edu/search/o?SEARCH=56123715 |title=GEORGE /All Locations |publisher=Catalog.library.georgetown.edu |access-date=2013-09-28}}</ref>
He was instrumental in publishing some of the earliest [[Solar spectrum|AM0 spectra]], which is a model spectrum of the sun in space. The historic 1973 [[Thekaekara spectrum]] was the basis for ASTM E490<ref>{{cite web|url=http://www.astm.org/Standards/E490.htm |title=ASTM E490 - 00a(2006) Standard Solar Constant and Zero Air Mass Solar Spectral Irradiance Tables |publisher=Astm.org |access-date=2013-09-28}}</ref> ([[American Society for Testing and Materials]] Standard Solar Constant and Zero Air Mass Solar Spectral Irradiance Table) from 1974 to 2000, when it was replaced by the most recent AM0 upgrade, in ASTM E490-00.

Recent publications such as a 2007 paper authored by fellow [[Malayali]] scientist P. Shahmugan made extensive reference to the [[Thekaekara spectrum]].<ref>Reference solar irradiance spectra and consequences of their
disparities in remote sensing of the ocean colour http://www.ann-geophys.net/25/1235/2007/angeo-25-1235-2007.pdf</ref> In 2008 a paper by authors from [[NASA]] Goddard Space Flight Center and [[University of Colorado system|UC]] Laboratory for Atmospheric and Space Physics also made extensive application of the [[Thekaekara spectrum]].<ref>Model Calculations of Solar Spectral Irradiance in the 3.7-�m Band for Earth Remote Sensing Applications [https://web.archive.org/web/20080828070114/http://modis-atmos.gsfc.nasa.gov/reference/docs/Platnick_&_Fontenla_(2008).pdf]</ref>

==Books==
*''The solar constant and the solar spectrum measured from a research aircraft, edited by Matthew P. Thekaekara. Solar energy. Spectrum, Solar. Aeronautics in astronomy''.<ref name="crescentmeadow1"/>
*''Thoughts twice dyed : reprinted from the series of "One minute meditation" / by Matthew P. Thekaekara, S.J'' <ref name="georgetown1"/>
*"The Extraterrestrial Solar Spectrum" A.J Drummond and M.P. Thekaekara, Eds. Institute of Environmental Sciences, Mount Prospect Illinois, 1973.<ref>{{cite web|url=http://rredc.nrel.gov/solar/spectra/am0/special.html#Thekaekara |title=Standard Solar Spectra: Special AM0 Spectra |publisher=Rredc.nrel.gov |access-date=2013-09-28}}</ref>

==References==

{{reflist}}

== Sources ==
*http://rredc.nrel.gov/solar/spectra/am0/special.html#Thekaekara
*http://rredc.nrel.gov/solar/spectra/am0/text/Thekaekara.txt

{{Scientific Research in Kerala |state=collapsed}}
{{Authority control}}

{{DEFAULTSORT:Thekaekara, Matthew Pothen}}
[[Category:Scientists from Kerala]]
[[Category:Spectroscopists]]
[[Category:1914 births]]
[[Category:1974 deaths]]

Matthew Pothen Thekaekara - Revision history

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