ISO LWS Observations of Mars: A Search for Diurnal Variability

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

A total of ten full ISO Long Wavelength Spectrometer (LWS) grating scans made at different epochs between 15th July and 27th August 1997 have been carefully reduced and analysed using LWS pipeline 7 software and the LWS Interactive Analysis tools. The results of a search for possible diurnal variation in the LWS wavelength range will be presented, together with a report on the comparison with predictions of a thermophysical model of the Martian surface. In order to put limits on instrumental effects and calibration drifts, any detected Martian variability will be checked against S106, a comparably bright non-varying astronomical calibration source observed routinely throughout the mission. The implications of this work on the role of Uranus as the LWS prime flux calibrator will also be discussed.

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