Quarterly 17/18/2007 INMS Team Third Quarter Report July, 2007 INMS Quarterly

Quarterly 27/18/2007 INMS Quarterly Accomplishments SCIENCE HIGHLIGHT: The INMS/CAPS paper on high-altitude aerosol formation at Titan was published in the May 12th issue of Science. SCIENCE HIGHLIGHT: Modeling by the INMS team indicates that energetic ions observed by MIMI have important consequences for the ionosphere and upper atmosphere. T32 provided excellent data on the high northern latitude ionosphere and atmosphere of Titan. It is the last opportunity for INMS to observe the high-latitude Titan atmosphere in the prime mission - a region where INMS and CAPS have observed high-altitude aerosol formation on T16. INMS, CAPS, and RPWS have begun a joint analysis of the complete atmosphere and ionosphere data set for Titan in hopes of understanding the role of coupled ion and neutral chemistry in aerosol formation. A joint CAPS and INMS study of the Titan exosphere has begun to understand the role of sputtering and ion pickup in the interaction of Titan’s iopnosphere with Saturn’s magnetosphere. The T33 Titan flyby provided an excellent opportunity to test the sequence that will be used for the close INMS flyby of Enceladus on rev 61. Analysis of the INMS Titan atmospheric data set continues to show high-altitude atmospheric variability that is a function of latitude with converging densities below 1000 km.

Quarterly 37/18/2007 INMS Quarterly SCIENCE HIGHLIGHT: The INMS/CAPS paper on high-altitude aerosol formation at Titan was published in the May 12th issue of Science. INMS benzene detection CAPS heavy positive ions CAPS negative ion aerosols CARTOON OF THOLIN FORMATION IN TITAN’S UPPER ATMOSPHERE

Quarterly 47/18/2007 INMS Quarterly SCIENCE HIGHLIGHT: Modeling by the INMS team indicates that energetic ions observed by MIMI have important consequences for the Titan upper atmosphere. Energetic Proton Energy Deposition into Titan’s Atmosphere vs. Altitude Using a globally averaged proton flux it is found that the energy deposition of the protons peaks near a altitude of 900 kmand is larger than the energy deposition due to both EUV and pickup ions.

Quarterly 57/18/2007 INMS Quarterly

Quarterly 67/18/2007 INMS Quarterly – Plans INMS looks forward to the flyby of Iapetus. This is the second icy satellite that we have flown by at a low enough altitude and with the proper orientation of the INMS sensor with respect to the spacecraft ram to have a reasonable chance of an atmospheric detection. The first such flyby was Enceladus. Upcoming close flybys of Titan’s atmosphere in the southern hemisphere will give INMS an opportunity to study the atmospheric structure in the southern hemisphere and to see if the colder temperatures and lower densities are symmetrically observed at both poles. INMS is finalizing plans and models for the upcoming close flyby of Enceladus on E61 to help determine the optimum trade between science and risk for the close flyby that is currently planned for 25 km above the surface. INMS is beginning planning for the high latitude (auroral) flybys of Saturn’s upper atmosphere.

Quarterly 77/18/2007 INMS Quarterly Science Published May 12th April, 2007 Waite, J.H., D.T.Young, A.J.Coates, T.E. Cravens, F. Crary, B. Magee, and J. Westlake The Process of Tholin Formation in Titan’s Upper Atmosphere Icarus in press April, 2007 De La Haye, V., J.H. Waite, T.E. Cravens, A.F.Nagy, R.E.Johnson, S. Lebonnois, I.P.Robertson Titan’s Corona: The Contribution of Exothermic Chemistry JGR in press April, 2007 De La Haye, V., J.H. Waite, R.E.Johnson, R.V. Yelle, T.E. Cravens, J.G. Luhmann, W.T. Kasprzak, D.A.Gell, B.Magee, F.LeBlanc, M.Michael, S. Jurac, I.P.Robertson Cassini INMS Data in Titan’s Upper Atmosphere and Exosphere: Observations of a Suprathermal Corona ISSI conference: Comparative Aeronomy June, 2007 T.E. Cravens, R.V. Yelle, S. Ledvina, J.H. Waite Presentations on Titan, Enceladus, and other related topics IAGAJuly, 2007 V. VuittonTitan Ion neutral chemistry