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Lageos orbit decay due to infrared radiation from Earth / D.P. Rubincam (1987)

Public Titre : Lageos orbit decay due to infrared radiation from Earth Type de document : Monographie Auteurs : D.P. Rubincam, Auteur Editeur : Washington : National Aeronautics and Space Administration NASA Année de publication : 1987 Collection : NASA Technical Memorandum num. 87804 Importance : 18 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Techniques orbitales [Termes IGN] inertie thermique [Termes IGN] Lageos [Termes IGN] orbite [Termes IGN] rayonnement infrarouge [Termes IGN] rétroréflecteur Résumé : (Auteur) Abstract Infrared radiation from the earth may be the principal reason for the decay of Lageos' orbit. The radiation heats up the laser retroreflectors embedded in Lageos' aluminum surface. This creates a north-south temperature gradient on the satellite. The gradient in turn causes a force to be exerted on Lageos because of recoil from photons leaving its surface. The delayed heating of the retroreflectors due to their thermal inertia gives the force a net alongtrack component which always acts like drag. A simple thermal model for the retroreflectors indicates that this thermal drag accounts for about half the observed average along-track acceleration of -.3 x 10-12 m S-2. The contribution from the aluminum surface to this effect is negligible. The infrared effect cannot explain the large observed fluctuations in drag which occur mainly when the orbit intersects the earth's shadow. Numéro de notice : 18705 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=55461

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
18705-01	21.10	Livre	Centre de documentation	Technologies spatiales	Disponible