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ISO LWS Observations of Mars—Detection of Rotational Modulation in the Far Infrared

✍ Scribed by S.D. Sidher; M.J. Griffin; G.R. Davis; B.M. Swinyard; M. Burgdorf; G.S. Orton; D.J. Rudy; Th. Encrenaz; E. Lellouch; Th. de Graauw

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
121 KB
Volume
147
Category
Article
ISSN
0019-1035

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✦ Synopsis

A series of far infrared (FIR) spectra of Mars between 43 and 196 µm was taken with the Long Wavelength Spectrometer (LWS) on board the European Space Agency's Infrared Space Observatory (ISO). Analysis of these medium-resolution data reveals a rotational modulation of the disk-averaged FIR brightness temperature. The observed variability of ±1.5% in the LWS wavelength range compares favorably with the predictions of a thermophysical model of the martian surface. A surface emissivity of ∼0.90 gives good agreement between the measured and the modeled brightness temperatures and leads to an improved estimate of the LWS photometric calibration uncertainty.

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