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Title: Response of dust on thermal emission spectra observed by Planetary Fourier Spectrometer (PFS) on-board Mars Express (MEX)
Authors: Masoom, J.
Haider, S A
Giuranna, Marco
Keywords: Mars atmosphere;Dust Storm
Issue Date: Mar-2019
Publisher: NISCAIR-CSIR, India
Abstract: The thermal emission spectra have provided many useful insights about the Martian atmosphere and surface. The interpretation of the thermal emission spectra can give us information about atmospheric temperature, pressure, mineralogy and presence of atmospheric constituents including their isotopes. In the present work, we have analysed the thermal emission data for dust storm season on Mars. The signature of dust in the thermal emission spectra for Martian Year (MY) 28 confirm the presence (Ls=280o and 300o) and the absence (Ls=240o and 320o) of the dust storm at latitude range 0o-10oS, 10o-20oS and 20o-30oS. We have compared our results with earlier mission data with thermal emission measurements made by Planetary Fourier Spectrometer (PFS) on-board Mars Express (MEX) between wave numbers 250-1400 cm-1. We have observed features at wave numbers 600-750 cm-1 and 900-1200 cm-1 due to absorptions by CO2 and dust respectively. We have obtained brightness temperatures from thermal emission spectra by inverting the Planck function. The maximum brightness temperature ~280o K was measured at Ls=240o when Mars received a large amount of solar radiation at perihelion. The minimum brightness temperature ~ 220o K was observed at Ls=320o in the absence of dust storm. In presence of dust storm, thermal emission spectra and brightness temperatures were reduced by factors of ~ 3.0 and ~1.3, respectively, between wave numbers 900-1200 cm-1 in comparison to that observed in absence of dust storm.
Page(s): 38-44
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.48(1-2) [March-June 2019]

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