Thekaekara spectrum

Rev. Dr. Matthew Pothen Thekaekara (1914–1974) was a scientist and author of many books and papers relating to spectrophotometry and the solar constant [1] besides works on theology.[2] He was instrumental in publishing some of the earliest AM0 spectra, which is a model spectrum of the sun in space. The historic 1973 Thekaekara spectrum was the basis for ASTM E490[3] (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.[4] In 2008 a paper by authors from NASA Goddard Space Flight Center and UC Laboratory for Atmospheric and Space Physics also made extensive application of the Thekaekara spectrum.[5]


1. The solar constant and the solar spectrum measured from a research aircraft, edited by Matthew P. Thekaekara. Solar energy. Spectrum, Solar. Aeronautics in astronomy.[1]

2. Thoughts twice dyed : reprinted from the series of "One minute meditation" / by Matthew P. Thekaekara, S.J [2]

3."The Extraterrestrial Solar Spectrum" A.J Drummond and M.P. Thekaekara, Eds. Institute of Environmental Sciences, Mount Prospect Illinois, 1973.[6]




This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.