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Titolo:
Occultation of stars in the UV: Study of the atmosphere of Mars
Autore:
Korablev, OI; Bertaux, JL; Dubois, JP;
Indirizzi:
Moscow Space Res Inst, Moscow 117810, Russia Moscow Space Res Inst Moscow Russia 117810 s Inst, Moscow 117810, Russia CNRS, Serv Aeron, F-91371 Verrieres Buisson, France CNRS Verrieres Buisson France F-91371 F-91371 Verrieres Buisson, France
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
fascicolo: E4, volume: 106, anno: 2001,
pagine: 7597 - 7610
SICI:
0148-0227(20010425)106:E4<7597:OOSITU>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
GENERAL-CIRCULATION MODEL; CROSS-SECTION MEASUREMENTS; MARTIAN ATMOSPHERE; PLANETARY-ATMOSPHERES; VERTICAL STRUCTURE; MOLECULAR-OXYGEN; DUST; OZONE; SPECTROSCOPY; DYNAMICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
55
Recensione:
Indirizzi per estratti:
Indirizzo: Korablev, OI Moscow Space Res Inst, Profsoyuznaya 84-32, Moscow 117810, Russia Moscow Space Res Inst Profsoyuznaya 84-32 Moscow Russia 117810
Citazione:
O.I. Korablev et al., "Occultation of stars in the UV: Study of the atmosphere of Mars", J GEO R-PLA, 106(E4), 2001, pp. 7597-7610

Abstract

The stellar occultation technique permits effective sounding of a tenuous planetary atmosphere, such as the atmosphere of Mars. On the basis of measuring characteristics of the SPICAM Light UV spectrometer for the spectral range of 118-320 nm, resolution 0.9 nm (to be flown at Mars-Express ESA mission), we have made some model simulations in order to estimate how the vertical profiles of CO2, temperature, O-3, aerosols, and clouds can be determined by the stellar occultation method. From the atmospheric absorption imprinted progressively on the star spectrum, the line densities of CO2, O-3, and dust are retrieved as a function of altitude. An inversion yields local densities of CO2 land therefore the temperature), ozone, and dust particle concentration. Several (3-5) occultations per orbit, preferably on the night side of the orbit, are foreseen, allowing good geographical coverage independently on the orbit. Observing a bright star tone out of similar to 30 in the sky), atmospheric density will be determined in the altitude range of10-170 km with an accuracy of 0.5-4%; temperature will be determined at 20-140 km with an accuracy of similar to3 K, and ozone can be retrieved with an accuracy of a few percent in a layer between 25 and 40 km or below, depending on its vertical distribution. Optically thin cloud structures can be studied, including night clouds, which cannot be observed in scattered light. Molecular oxygen can be measured with an accuracy of 10%, and a search of SO2 will be performed. The results of this study can easily be applied toother instrumental characteristics.

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Documento generato il 06/04/20 alle ore 21:29:50