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dc.contributor.authorKockarts, G.
dc.date2002
dc.date.accessioned2017-05-03T11:53:26Z
dc.date.available2017-05-03T11:53:26Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/5185
dc.descriptionAeronomy is, by definition, a multidisciplinary science which can be used to study the terrestrial atmosphere, as well as any planetary atmosphere and even the interplanetary space. It was officially recognized in 1954 by the International Union of Geodesy and Geophysics. The major objective of the present paper is to show how aeronomy developed since its infancy. The subject is so large that a guideline has been chosen to see how aeronomy affects our atmospheric knowledge. This guideline is the solar Lyman alpha radiation which has different effects in the solar system. After a short description of the origins of aeronomy the first observations of this line are summarized since the beginning of the space age. Then the consequences of these observations are analyzed for the physics and chemistry of the neutral terrestrial atmosphere. New chemical processes had to be introduced, as well as new transport phenomena. Solar Lyman alpha also influences the structure of the Earth's ionosphere, particularly the D-region. In the terrestrial exosphere, solar Lyman alpha scattered resonantly by atomic hydrogen is at present the only way to estimate this constituent in an almost collisionless medium. Since planetary atmospheres also contain atomic hydrogen, the Lyman alpha line has been used to deduce the abundance of this constituent. The same is true for the interplanetary space where Lyman alpha observations can be a good tool to determine the concentration. The last section of the paper presents a question which is intended to stimulate further research in aeronomy.
dc.languageeng
dc.titleAeronomy, a 20th century emergent science: the role of solar Lyman series
dc.typeArticle
dc.subject.frascatiPhysical sciences
dc.audienceScientific
dc.subject.freeatmospheric chemistry
dc.subject.freeatmospheric structure
dc.subject.freegeophysics
dc.subject.freehistory of geography
dc.subject.freeplanetary atmosphere
dc.source.titleAnnales Geophysicae
dc.source.volume20
dc.source.issue5
dc.source.page585-598
Orfeo.peerreviewedYes
dc.identifier.doi10.5194/angeo-20-585-2002
dc.identifier.scopus2-s2.0-0036072101


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