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Near-UV to near-IR disk-averaged Earth's reflectance spectra

Published online by Cambridge University Press:  02 May 2006

S. Hamdani ,
L. Arnold ,
C. Foellmi ,
J. Berthier ,
D. Briot ,
P. François ,
P. Riaud  and
J. Schneider
S. Hamdani
Affiliation:
Observatoire de Haute Provence (CNRS-OAMP), 04870 St Michel l'Observatoire, France email: [email protected]
L. Arnold
Affiliation:
Observatoire de Haute Provence (CNRS-OAMP), 04870 St Michel l'Observatoire, France email: [email protected]
C. Foellmi
Affiliation:
ESO, Casilla 19001, Santiago 19, Chile
J. Berthier
Affiliation:
IMCCE, Observatoire de Paris, 77 Avenue Denfert-Rochereau, 75014 Paris, France
D. Briot
Affiliation:
Observatoire de Paris-Meudon, 5 place Jules Janssen 92195 Meudon, France
P. François
Affiliation:
Observatoire de Paris-Meudon, 5 place Jules Janssen 92195 Meudon, France
P. Riaud
Affiliation:
Institut d'Astrophysique et de Géophysique de Liège, Université de Liège, Allée du 6 Août, 4000, Sart-Tilman, Belgium
J. Schneider
Affiliation:
Observatoire de Paris-Meudon, 5 place Jules Janssen 92195 Meudon, France
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Abstract

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We report 320 to 1020nm disk-averaged Earth reflectance spectra obtained from Moon's Earthshine observations with the EMMI spectrograph on the NTT at ESO La Silla (Chile). The spectral signatures of Earth atmosphere and ground vegetation are observed. A vegetation red-edge of up to 9% is observed on Europe and Africa and ${\approx}2%$ upon Pacific Ocean. The spectra also show that Earth is a blue planet when Rayleigh scattering dominates, or totally white when the cloud cover is large.

Keywords

Earthalbedoreflectancevegetation red-edgebiosignaturebiomarkerEarthshine
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C200: Direct Imaging of Exoplanets: Science & Techniques , October 2005 , pp. 83 - 88
Copyright
© 2006 International Astronomical Union