A-Train
A-Train bezeichnet eine Flotte von Raumflugkörpern, die aus fünf Satelliten besteht.
Dabei handelt es sich um die Satelliten Aqua, Aura, CloudSat, PARASOL und CALIPSO. 2009 sollte zusätzlich der Satellit OCO dazukommen. Sie befinden sich in einer gemeinsamen niedrigen Umlaufbahn in einer Höhe von 705 Kilometern bei der Inklination 98 Grad. Gemeinsam erzeugen die teilweise ähnlichen wissenschaftlichen Instrumente ein Übersichtsbild des irdischen Wetters und globalen Klimas. Die Daten der Satelliten ergänzen sich, da alle das gleiche Gebiet mit nur wenigen Minuten Zeitunterschied überfliegen und so verschiedene Messungen der gleichen Wetter- und Umweltsituation ermöglichen.
Der Name A-Train stammt von dem Jazz-Titel Take the A Train (Billy Strayhorn), der die Fahrt in einer New Yorker U-Bahn der Linie A zum Thema hat. Die Satellitengruppe erhielt diese Bezeichnung, weil die Satelliten aufgereiht wie Waggons eines Zuges auf derselben Bahn laufen.
Quellen
- The Earth Observing System (englisch)
- NASA shelves climate satellites (englisch)
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