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HITRAN (an acronym for High Resolution Tra … HITRAN (an acronym for High Resolution Transmission) molecular spectroscopic database is a compilation of spectroscopic parameters used to simulate and analyze the transmission and emission of light in gaseous media, with an emphasis on planetary atmospheres. The knowledge of spectroscopic parameters for transitions between energy levels in molecules (and atoms) is essential for interpreting and modeling the interaction of radiation (light) within different media. For half a century, HITRAN has been considered to be an international standard which provides the user a recommended value of parameters for millions of transitions for different molecules. HITRAN includes both experimental and theoretical data which are gathered from a worldwide network of contributors as well as from articles, books, proceedings, databases, theses, reports, presentations, unpublished data, papers in-preparation and private communications. A major effort is then dedicated to evaluating and processing the spectroscopic data. A single transition in HITRAN has many parameters, including a default 160-byte fixed-width format used since HITRAN2004. Wherever possible, the retrieved data are validated against accurate laboratory data. The original version of HITRAN was compiled by the US Air Force Cambridge Research Laboratories (1960s) in order to enable surveillance of military aircraft detected through the terrestrial atmosphere. One of the early applications of HITRAN was a program called Atmospheric Radiation Measurement (ARM) for the US Department of Energy. In this program spectral atmospheric measurements were made around the globe in order to better understand the balance between the radiant energy that reaches Earth from the sun and the energy that flows from Earth back out to space. The US Department of Transportation also utilized HITRAN in its early days for monitoring the gas emissions (NO, SO2, NO2) of super-sonic transports flying at high altitude. HITRAN was first made publicly available in 1973 and today there are a multitude of ongoing and future NASA satellite missions which incorporate HITRAN. One of the NASA missions currently utilizing HITRAN is the Orbiting Carbon Observatory (OCO) which measures the sources and sinks of CO2 in the global atmosphere. HITRAN is a free resource and is currently maintained and developed at the Center for Astrophysics | Harvard & Smithsonian, Cambridge MA, USA (CFA/HITRAN). HITRAN is the worldwide standard for calculating or simulating atmospheric molecular transmission and radiance from the microwave through ultraviolet region of the spectrum. The HITRAN database is officially released on a quadrennial basis, with updates posted in the intervening years on HITRANonline. There is a new journal article published in conjunction with the most recent release of the HITRAN database, and users are strongly encouraged to use the most recent edition. Throughout HITRAN's history, there have been around 50,000 unique users of the database and in recent years there are over 24,000 users registered on HITRANonline. There are YouTube tutorials on the HITRANonline webpage to answer frequently asked questions by users.nswer frequently asked questions by users.
, HITRAN (acronyme de High Resolution Transm … HITRAN (acronyme de High Resolution Transmission) est une base de données spectroscopiques, compilation de paramètres spectroscopiques permettant de prédire et simuler par informatique l'absorption et l'émission de lumière dans des milieux gazeux. Compilée par le laboratoire de recherche Air Force Cambridge dans les années 1960, HITRAN est mise à jour par le Harvard-Smithsonian Center for Astrophysics à Cambridge (Massachusetts) à partir de données issues de nombreux laboratoires dans le monde. HITRAN est la norme mondiale pour les problèmes de rayonnement dans les gaz du domaine des micro-ondes jusqu'au domaine ultraviolet. La version 2021 contient 55 espèces moléculaires ainsi que leurs isotopologues les plus importants. Ces données sont archivées sous forme d'un grand nombre de transitions de raies, chacune contenant de nombreux paramètres spectraux nécessaires aux simulations à haute résolution. En outre, 320 espèces moléculaires ont été collectées sous forme de sections efficaces. Celles-ci comprennent des composants anthropiques dans l'atmosphère tels que les chlorofluorocarbures. Cette bibliothèque est en usage libre et téléchargeable à partir d'un site FTP du Harvard-Smithsonian Center for Astrophysics. Un outil en ligne pour parcourir, filtrer et tracer les données, appelé HITRANonline est fourni. De plus, une bibliothèque Python HAPI (HITRAN Application Programming Interface) est incluse. Elle sert d’outil pour les calculs de coefficients d’absorption et de transmission, leur représentation graphique, ainsi que pour la comparaison d’ensembles de données spectroscopiques.n d’ensembles de données spectroscopiques.
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HITRAN (acronyme de High Resolution Transm … HITRAN (acronyme de High Resolution Transmission) est une base de données spectroscopiques, compilation de paramètres spectroscopiques permettant de prédire et simuler par informatique l'absorption et l'émission de lumière dans des milieux gazeux. Compilée par le laboratoire de recherche Air Force Cambridge dans les années 1960, HITRAN est mise à jour par le Harvard-Smithsonian Center for Astrophysics à Cambridge (Massachusetts) à partir de données issues de nombreux laboratoires dans le monde.es de nombreux laboratoires dans le monde.
, HITRAN (an acronym for High Resolution Tra … HITRAN (an acronym for High Resolution Transmission) molecular spectroscopic database is a compilation of spectroscopic parameters used to simulate and analyze the transmission and emission of light in gaseous media, with an emphasis on planetary atmospheres. The knowledge of spectroscopic parameters for transitions between energy levels in molecules (and atoms) is essential for interpreting and modeling the interaction of radiation (light) within different media. radiation (light) within different media.
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HITRAN
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