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Scientific objectives of the DYNAMO mission

Eric Chassefière 1 François Forget 1 F. Hourdin 1 F. Vial 1 H. Rème 2 C. Mazelle 2 D. Vignes 2 J.-A. Sauvaud 2 P.-L. Blelly 2 D. Toublanc 2 Jean-Jacques Berthelier 3 Jean-Claude Cerisier 3 Gérard Chanteur 3 L. Duvet 3 Michel Menvielle 3 J. Lilensten 4 Olivier Witasse 4 P. Touboul 5 Eric Quémerais 6 Jean-Loup Bertaux 6 G. Hulot 7 Y. Cohen 7 P. Lognonné 7 J.P. Barriot 8 G. Balmino 8 M. Blanc 8 P. Pinet 8 Michel Parrot 9 Jean-Gabriel Trotignon 9 M. Moncuquet 10 J.-L. Bougeret 10 K. Issautier 10 E. Lellouch 10 N. Meyer 10 C. Sotin 11 O. Grasset 11 F. Barlier 12 C. Berger 12 P. Tarits 13 J. Dyment 13 D. Breuer 14 T. Spohn 14 M. Pätzold 15 K. Sperveslage 15 P. Gough 16 A. Buckley 16 K. Szego 17 S. Sasaki 18 S. Smrekar 19 D. Lyons 19 M. Acuna 20 J. Connerney 20 M. Purucker 20 R. Lin 21 J. Luhmann 21 D. Mitchell 21 François Leblanc 22 R. Johnson 22 J. Clarke 23 A. Nagy 23 D. Young 23 S. Bougher 24 G. Keating 25 R. Haberle 26 B. Jakosky 27 R. Hodges 28 M. Parmentier 29 H. Waite 30 D. Bass 30
Abstract : DYNAMO is a small Mars orbiter planned to be launched in 2005 or 2007, in the frame of the NASA/ CNES Mars exploration program. It is aimed at improving gravity and magnetic field resolution, in order to better understand the magnetic, geologic and thermal history of Mars, and at characterizing current atmospheric escape, which is still poorly constrained. These objectives are achieved by using a low periapsis orbit, similar to the one used by the Mars Global Surveyor spacecraft during its aerobraking phases. The proposed periapsis altitude for DYNAMO of 120–130 km, coupled with the global distribution of periapses to be obtained during one Martian year of operation, through about 5000 low passes, will produce a magnetic/gravity field data set with approximately five times the spatial resolution of MGS. Additional data on the internal structure will be obtained by mapping the electric conductivity. Low periapsis provides a unique opportunity to investigate the chemical and dynamical properties of the deep ionosphere, thermosphere, and the interaction between the atmosphere and the solar wind, therefore atmospheric escape, which may have played a crucial role in removing atmosphere and water from the planet.
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Eric Chassefière, François Forget, F. Hourdin, F. Vial, H. Rème, et al.. Scientific objectives of the DYNAMO mission. Advances in Space Research, Elsevier, 2001, 27 (11), pp.1851-1860. ⟨10.1016/S0273-1177(01)00338-6⟩. ⟨insu-03234667⟩



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