1 Acun？ M H, Connerney J E P, Wasilewsk P, et al. Magnetic field of Mars: Summary of results from the aerobraking and mapping orbits. JGeophys Res, 2001, 106: 23403-23417？？
[2]
2 Acun？ M H, Connerney J E P, Wasilewsk P, et al. Magnetic field and plasma observations at Mars: Initial results of the Mars GlobalSurveyor mission. Science, 1998, 279: 1676-1680？？
[3]
3 Acun？ M H, Connerney J E P, Ness N F, et al. Global distribution of crustal magnetization discovered by the Mars Global SurveyorMAG/ER experiment. Science, 1999, 284: 790-793？？
[4]
4 Connerney J E P, Acun？ M H, Wasilewski P J, et al. Magnetic lineations in the ancient crust of Mars. Science, 1999, 284: 794-798？？
[5]
5 Langel R A, Phillips J D, Horner R J. Initial scalar magnetic anomaly map from Magsat. Geophys Res Lett, 1982, 9: 269-272？？
[6]
6 Purucker M D, Ravat T J, Sabaka C, et al. An altitude-normalized magnetic map of Mars and its interpretation. Geophys Res Lett, 2000, 27:2449-2452？？
[7]
7 Purucker M D, Clark D. Exploration Geophysics on Mars: Lessons from magnetics. Leading Edge, 2000, 19: 484-487？？
[8]
8 Purucker M, Langlais B, Mandea M. Interpretation of a magnetic map of the Valles Marineris region. Mars, Extended Abstract from the 32nd Lunar and Planetary Conference, 2001
[9]
9 Larmor J. How could a rotating body such as the Sun become a magnet. Rep Br Assoc Adv Sci, 1919, 87: 159-160
[10]
10 Merrill R T, McElhinney M W, McFadden P L. The Magnetic Field of the Earth. New York: Academic Press, 1998
[11]
11 Elasser W M. Induction effects in terrestrial magnetism. Theory Phys Rev, 1946, 69: 106-116？？
[12]
12 Bullard E C, Gellman H. Homogeneous dynamo and terrestrial magnetism. Phil Trans R Soc Lond, 1954, 247: 213-279？？
[13]
13 Kuang W J, Bloxham J. A numerical dynamo model in an Earth-like dynamical regime. Nature, 1997, 389: 371-374？？
18 Childress S, Soward A M. Convection-driven hydromagnetic dynamo. Phy Rev Lett, 1972, 29: 837-839？？
[19]
19 Pierre M G. The strong field branch of the Childress-Soward dynamo. In: Proctor M R E, Matthews P C, Rucklidge A M, eds. Solar andPlanetary Dynamos. Proceedings of NATO Advanced Study Institute. Cambridge: Cambridge University Press, 1993. 295-302
[20]
20 Kuang W, Jiang W, Wang T. Sudden termination of Martian dynamo? Implications from subcritical dynamo simulations. Geophys Res Lett,2008, 35: L14204, doi: 10.1029/2008GL034183？？
[21]
21 Lillis R J, Frey H V, Manga M. Rapid decrease in Martian crustal magnetization in the Noachian era: Implications for the dynamo andclimate of early Mars. Geophys Res Lett, 2008, 35: L14203, doi: 10.1029/2008GL034338？？
[22]
22 Lillis R J, Frey H V, Manga M, et al. An improved crustal magnetic field map of Mars from electron reflectometry: Highland volcanomagmatic historyand the end of the Martian dynamo. Icarus, 2008, 194: 575-596？？
[23]
23 Kuang W J, Chao B F. Topographic core-mantle coupling in geodynamo modeling. Geophys Res Lett, 2001, 28: 1871-1874？？
[24]
24 Kuang W J. Force balances and convective state in the Earth’s core. Phys Earth Planet Inter, 1999, 116: 65-79？？
[25]
25 Kuang W J, Bloxham J. Numerical modeling of magnetiohy drodynamic convection in a rapidly rotating spherical shell: Weak and strongfield dynamo action. J Comp Phys, 1999, 153: 51-81？？
[26]
26 Kuang W J, Bloxham J. Numerical dynamo modeling: Comparison with the Earth’s magnetic field. In: Gurnis M, ed. The Core-MantleBoundary Region. Geodynamics Series, AGU Monograph. Washington DC: American Geophysical Union, 1998. 197-208
[27]
27 Stevenson D J. Mars’ core and magnetism. Nature, 2001, 412: 214-219？？
[28]
34 Hood L L, Herbert G, Sonett C P. The deep lunar electrical conductivity profile: Structural and thermal inferences. Phys Earth Plan Int,1982, 87: 5311-5326
[29]
35 Hood L L, Zakharian A. Mapping and modeling of magnetic anomalies in the northern polar region of Mars. J Geophys Res, 2001, 106:14601-14619？？
[30]
36 Frey H. Ages of very large impact basins on Mars: Implications for the later heavy bombardment in the inner solar system. Geophys ResLett, 2008, 28: 4015-4018
[31]
37 Roberts J H, Lillis R J, Manga M. Giant impacts on early Mars and the cesstion of the Martian dynamo. J Geophys Res, 2009, 114, doi:10.1029/2008JE003287
[32]
38 Stanley S, Linda E T, Maria T, et al. Mars’ paleomagnetic field as the result of a single-hemisphere dynamo. Science, 2008, 321: 1822-1825？？
[33]
28 Kuang W, Jiang W. Numerical simulation of historical martian dynamo: Onset and annihilation of the dynamo action. 38th Lunar andPlanetary Science Conference, Texas. LPI Contribution No 1338, 2007. 2212
[34]
29 Xu W Y. Eigen mode analysis of the Earth’s main magnetic field during 1900-2000. Chin J Geophys, 1998, 41: 1-9
31 Arkani-Hamed J. Timing of the martian core dynamo. J Geophys Res, 2004, 109: E03006
[37]
32 Arkani-Hamed J. Paleomagnetic pole positions and pole reversals of Mars. Geophys Res Lett, 2001, 28: 3409-3412？？
[38]
33 Hood L L, Richmond N C, Pierazzo E, et al. Distribution of crustal magnetic fields on Mars: Shock effects of basin-forming impacts.Geophys Res Lett, 2003, 30: 1281, doi: 10.1029/2002GL016657？？
