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Simple parameterization of the absorption of the solar Lyman-alpha line

dc.contributor.authorChabrillat, S.
dc.contributor.authorKockarts, G.
dc.date1997
dc.date.accessioned2017-05-22T13:24:52Z
dc.date.available2017-05-22T13:24:52Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/5482
dc.descriptionThe absorption of the solar Lyman-alpha line by the terrestrial atmosphere is calculated, taking in account the wavelength variations of the emission line and of the O2 cross-section, as well as the temperature dependence of the cross-section. A new parameterization is developed to reproduce in atmospheric models the results of this high-resolution calculation, up to an attenuation of 1010 for the incident solar radiation. The error made in most of existing models when computing the Lyman-alpha contribution to photo dissociation rates in the middle atmosphere, using a constant O2 cross-section of 10-20 cm2, is shown to be important and this can affect the loss rate of mesospheric constituents such as H2O or CH4. Copyright 1997 by the American Geophysical Union.
dc.languageeng
dc.titleSimple parameterization of the absorption of the solar Lyman-alpha line
dc.typeArticle
dc.subject.frascatiPhysical sciences
dc.audienceScientific
dc.subject.freeAtmospheric optics
dc.subject.freeAtmospheric temperature
dc.subject.freeDissociation
dc.subject.freeLight absorption
dc.subject.freeMethane
dc.subject.freeOxygen
dc.subject.freePhotochemical reactions
dc.subject.freeSolar radiation
dc.subject.freeThermal effects
dc.subject.freeWater
dc.subject.freeDissociation
dc.subject.freeTemperature distribution
dc.subject.freeSolar Lyman alpha line
dc.subject.freeAtmospheric chemistry
dc.subject.freeIncident solar radiation
dc.subject.freeabsorption
dc.subject.freesolar activity
dc.subject.freesolar Lyman alpha line
dc.subject.freeAlpha contribution
dc.subject.freeAtmospheric model
dc.subject.freeEmission lines
dc.subject.freeHigh resolution
dc.subject.freeLoss rates
dc.subject.freeMiddle atmosphere
dc.subject.freeTemperature dependence
dc.source.titleGeophysical Research Letters
dc.source.volume24
dc.source.issue21
dc.source.page2659-2662
Orfeo.peerreviewedYes
dc.identifier.doi10.1029/97GL52690
dc.identifier.scopus2-s2.0-0031277842


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