The Huygens Atmospheric Structure Instrument (HASI)
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The Huygens Atmospheric Structure Instrument (HASI)
The Huygens Atmospheric Structure Instrument (HASI) Project Manager: prof. Francesco Angrilli, CISAS “G. Colombo”, Univ. Padova, Italy. Principal Investigator: prof. Marcello Fulchignoni, Univ. Paris VII / LESIA, Obs. Paris, France HASI Project Management Office: at CISAS “G. Colombo”, University of Padova, Italy Mission Description: In the framework of the NASA/ASI/ESA Cassini-Huygens mission towards the Saturnian system, HASI is one of the six experiments onboard the Huygens probe. HASI is a multisensor package designed to measure the physical quantities characterizing Titan’s atmosphere during the entry and descent of the Huygens probe and investigating the surface of the biggest moon of Saturn. HASI Scientific objectives • Determine the atmospheric temperature profiles. pressure and • Evaluate the density and molecular weight profiles. • Determine the atmospheric electric conductivity and charge carrier profiles. • Investigate ionisation processes. • Survey wave electric fields and atmospheric lightning; analysis of quasi-static electric fields leading to storm formation. • Detect acoustic noise due to turbulence or thunder storms. • Characterize the roughness, mechanical and electrical properties of the surface material whatever its phase, solid or liquid. Instrument Description: HASI is composed of 4 subsystems: the triaxial accelerometer (ACC), the deployable boom system (DBS), the stem (STUB) carrying the temperature sensors, a Kiel probe pressure inlet, an acoustic sensor and the data processing unit (DPU). The scientific measurements are performed by four sensor packages: the accelerometers (ACC), the temperature sensors (TEM), the Pressure Profile Instrument (PPI) and the Permittivity Wave and Altimeter package (PWA). http://cisas.unipd.it/hasi/welcome.html The HASI team at CISAS has been responsible for the design and qualification of the STUB subsystem and the TEM sensors (Platinum thermometers of new concept). It has been responsible for the Assembly, Integration, and Verification campaign at instrument and system level including inflight cruise checkouts every 6 months. CISAS hosts the HASI Project Management Office, responsible for the HASI team coordination. HASI PI and CoI's Principal Investigator: M. Fulchignoni Co-Investigators: F. Angrilli G. Bianchini F. Ferri A. Bar-Nun M.A. Barucci A. Coustenis W. Borucki C. McKay M. Coradini P. Falkner R. Grard H. Svedhem E. Flamini M. Hamelin A.M. Harri G.W. Leppelmeier J.J. Lopez-Moreno R. Rodrigo J.A.M. McDonnell J.C. Zarnecki F.H. Neubauer A. Pedersen G. Picardi V. Pirronello K. Schwingenschuh Université de Paris VII / LESIA Obs. Paris-Meudon, France C.I.S.A.S. "G. Colombo", University of Padova (UPD) Italy Dept. Geophys. & Planetary Sciences, Univ. Tel Aviv, Israel LESIA Obs. Paris-Meudon, France NASA/AMES, Moffet Field CA 94035, USA ESA Headquarter, Science Directorate, Paris, France ESTEC, (RSSD), Noordwijk, The Netherlands Agenzia Spaziale Italiana (ASI), Roma, Italy CETP, St. Maur, France Finnish Meteorological Institute (FMI), Helsinki, Finland Instituto de Astrofisica de Andalucia (IAA), Granada, Spain PSSRI, Open University, Milton Keynes, UK University of Cologne (UKK ), Koeln, Germany University of Oslo, Norway University "La Sapienza" Roma, Italy Osservatorio Astrofisico di Catania, Italy Space Research Institute, (IWF), Graz, Austria http://cisas.unipd.it/hasi/welcome.html