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arXiv 2102.10595astro-ph.EP
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对木星深喷流纬向廓线的限制

Constraints on the latitudinal profile of Jupiter's deep jets

E. Galanti, Y. Kaspi, K. Duer, L. Fletcher, A. P. Ingersoll, C. Li, G. S. Orton, T. Guillot, S. M. Levin, S. J. Bolton

摘要:

在木星云顶观测到的纬向风已经被证明与木星重力场的不对称部分密切相关。然而,其他测量表明,在某些纬度地区,云下的气流可能与观测到的云级风有些不同。在这里,我们表明,使用对称和非对称部分的测量重力场,观测到的云级风廓线之间的25 $^{\circ}$ S和25 $^{\circ}$ N必须延伸到数千公里的深度不变。向极,中纬度深急流也有助于重力信号,但可能与云级风略有不同。我们分析这种差异的可能性,并给出其强度的界限。我们还发现,为了与重力测量相匹配,风必须在平行于木星自转轴的方向上向内投射,并且它们向内的衰减应该在径向方向上。

英文摘要:

The observed zonal winds at Jupiter's cloud tops have been shown to be closely linked to the asymmetric part of the planet's measured gravity field. However, other measurements suggest that in some latitudinal regions the flow below the clouds might be somewhat different from the observed cloud-level winds. Here we show, using both the symmetric and asymmetric parts of the measured gravity field, that the observed cloud-level wind profile between 25$^{\circ}$S and 25$^{\circ}$N must extend unaltered to depths of thousands of kilometers. Poleward, the midlatitude deep jets also contribute to the gravity signal, but might differ somewhat from the cloud-level winds. We analyze the likelihood of this difference and give bounds to its strength. We also find that to match the gravity measurements, the winds must project inward in the direction parallel to Jupiter's spin axis, and that their decay inward should be in the radial direction.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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