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Vertical shears in Saturn's eastward jets at cloud level |
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| Authors: | Enrique García-Melendo Agustín Sánchez-Lavega S Pérez-Hoyos |
| Institution: | a Esteve Duran Observatory Foundation, Montseny 46, 08553 Seva, Spain b Departamento de Física Aplicada I, E.T.S. Ingenieros, Universidad del País Vasco, Alameda Urquijo s/n, 48013 Bilbao, Spain c Departamento de Física Aplicada I, E.U.I.T.I., Universidad País Vasco, Bilbao, Spain |
| Abstract: | We have measured the vertical shear of the zonal winds in the cloud-haze upper layer of Saturn using Cassini ISS images obtained in the filters MT2 (753 nm methane absorption band, sensitive to the upper haze) and CB2 (adjacent continuum, sensitive to the lower cloud). Our radiative transfer models indicate that at the eastward jet peaks these filters are sensing clouds at the respective ∼100 mbar and ∼350 mbar levels. We have found a systematic velocity difference between those filters of 15 to 20 m s−1 only in the eastward jets peaks (27° S, 42° S, 55° S and 70° S) which implies a vertical shear of ∼10-20 m s−1 H−1. Our overall results agree with those derived from the thermal-wind relationship using CIRS thermal data Fletcher, L.N., and 13 colleagues, 2008. Science 319, 79-81] and with previous equatorial measurements Sánchez-Lavega, A., Hueso, R., Pérez-Hoyos, S., 2007. Icarus 187, 510-519]. |
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