Ester Aranzana 13 de Enero de 2012.  Rock core (Fe-FeS)  No internal magnetic field, no dynamo action but it has one in the past mini-magnetospheres.

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Presentation transcript:

Ester Aranzana 13 de Enero de 2012

 Rock core (Fe-FeS)  No internal magnetic field, no dynamo action but it has one in the past mini-magnetospheres of crustal origin

Mars Global Surveyor(1996) - MGS MAG: Magnetic vector data sparsely from km - MGS ER: scalar field at 180 km Others: Balloon magnetometer Rover on Martian surface Laboratory studies

EARTH MARS NASA Magnetic anomalies one order of magnitude higher!!

Plate tectonics era Strong magnetization requires huge volumes ( km radii, km thicknesses) 2 faults similar to Earth faults with E- W trending features alternating polarity Connerney et al. 2005

 No magnetic signatures in basins Hellas, Isydis and Argyre => Shock demagnetization  No magnetic signature in volcanoes provinces (Tharsis & Elysium)=> thermal demagnetization by intrusions Harkani-Hamed 2001

Mini-magnetospheres above regions with strong magnetized crust. Brain et al Aurorae at different latitudes, first discovered by Mars Express in 2004 above Terra Cimmeria (south of Mars) ESA

- Cessation of the core field around 4.1 Gyr By cooling of the planet. - Faults, lineations => Plate tectonics era in presence of a reversing dynamo - Origin dichotomy: the new mode is a huge impact Other explanations: Volcanic features, plate tectonics Roberts et al Internal magnetic field in the past =>The evolution of climate and habitability in Mars

 Connerney, J.E.P, Acuña, M.H. et al. 2005, Tectonic implications of Mars crustal magnetism, PNAS October 18, 2005 vol. 102 no  Roberts, J.H., Lillis, R.J., Manga, M. 2009, Giant impacts an Mars cessation of the Martian dynamo, JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 114, E04009, doi: /2008JE003287, 2009  Jafar Arkani-Hamed 2001, A 50-degree spherical model of the magnetic field of Mars, JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 106, NO.10, PAGES 23,197-23,208.  Purucker, M., Ravat, D., Frey, H., Voorhies, C., Sabaka, T. & Acuña, M. 2000, An altitude-normalized magnetic map of Mars and its interpretation, GEOPHYSICAL RESEARCH LETTERS, VOL. 27, NO. 16, PAGES  Acuña, M. H., Connerney, J.E.P et al. 2001, Magnetic field of Mars: Summary of results from the aerobraking and mapping orbits, JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 106, NO. E10, PAGES 23,403–23,417  Brain, D.A., Baker, A.H., Briggs, J., Eastwood, J.P., Halekas, J.S. & Phan, T.D. 2010, Episodic detachment of Martian crustal magnetic fields leading to bulk atmospheric plasma to escape, GEOPHYSICAL RESEARCH LETTERS, VOL.37, L  Planetary Sciences, Imke de Pater & Jack J. Lissauer, Cambridge University Press 2001.

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