A New Model of Jupiter's Magnetic Field at the Completion of Juno's Prime Mission

被引:122
作者
Connerney, J. E. P. [1 ,2 ]
Timmins, S. [2 ,3 ]
Oliversen, R. J. [2 ]
Espley, J. R. [2 ]
Joergensen, J. L. [4 ]
Kotsiaros, S. [4 ]
Joergensen, P. S. [4 ]
Merayo, J. M. G. [4 ]
Herceg, M. [4 ]
Bloxham, J. [5 ]
Moore, K. M. [6 ]
Mura, A. [7 ]
Moirano, A. [7 ]
Bolton, S. J. [8 ]
Levin, S. M. [6 ,9 ]
机构
[1] Space Res Corp, Annapolis, MD 21403 USA
[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[3] ADNET Syst Inc, Bethesda, MD USA
[4] Tech Univ Denmark DTU, Lyngby, Denmark
[5] Harvard Univ, Cambridge, MA 02138 USA
[6] CALTECH, Pasadena, CA 91125 USA
[7] INAF IAPS, Rome, Italy
[8] Southwest Res Inst, San Antonio, TX USA
[9] Jet Prop Lab JPL, Pasadena, CA USA
关键词
Jupiter planetary magnetic field; Jupiter dynamo; Jupiter interior; magnetic field generation; secular variation; Juno Mission; IO FLUX TUBE; MOLECULAR-HYDROGEN; GEOMAGNETIC-FIELD; POWER SPECTRUM; METALLIZATION; CONDUCTIVITY; CONVECTION; ATMOSPHERE;
D O I
10.1029/2021JE007055
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
A spherical harmonic model of the magnetic field of Jupiter is obtained from vector magnetic field observations acquired by the Juno spacecraft during 32 of its first 33 polar orbits. These Prime Mission orbits sample Jupiter's magnetic field nearly uniformly in longitude (similar to 11 degrees separation) as measured at equator crossing. The planetary magnetic field is represented with a degree 30 spherical harmonic and the external field is approximated near the origin with a simple external spherical harmonic of degree 1. Partial solution of the underdetermined inverse problem using generalized inverse techniques yields a model ("JRM33") of the planetary magnetic field with spherical harmonic coefficients reasonably well determined through degree and order 13. Useful information regarding the field extends through degree 18, well fit by a Lowes' spectrum with a dynamo core radius of 0.81 R-j, presumably the outer radius of the convective metallic hydrogen region. This new model provides a most detailed view of a planetary dynamo and evidence of advection of the magnetic field by deep zonal winds in the vicinity of the Great Blue Spot (GBS), an isolated and intense patch of flux near Jupiter's equator. Comparison of the JRM33 and JRM09 models suggests secular variation of the field in the vicinity of the GBS during Juno's nearly 5 years of operation in orbit about Jupiter. The observed secular variation is consistent with the penetration of zonal winds to a depth of similar to 3,500 km where a flow velocity of similar to 0.04 ms(-1) is required to match the observations.
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页数:15
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