A Possible Mechanism to Explain the Prograde Equatorial Jet of a Jupiter-like Gaseous Giant
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| Format: | Preprint |
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2026
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| _version_ | 1866915897406390272 |
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| author | Lian, Yuchen Duan, Pengshuo Kong, Dali |
| author_facet | Lian, Yuchen Duan, Pengshuo Kong, Dali |
| contents | Gaseous giants are characterized by their deep atmospheres, which lack clear boundaries with their interiors; therefore, their internal states could directly influence atmospheric dynamics. So far, most modeling studies have considered deep convection as the primary mechanism by which the interior influences atmospheric dynamics. In this work, we propose another possible mechanism that might crucially determine the appearance of gaseous giants' atmospheric cloud-top jet winds, tracing them to a typical hydromagnetic wave (the so-called equatorial Magnetic-Archimedes-Coriolis wave) generated within the stably stratified, strongly magnetized helium rain layer. The associated thermal perturbations can propagate upward through the convective molecular hydrogen envelope, eventually affecting the atmospheric thermal structure - the zonal inhomogeneities that are conducive to the formation of the eastward atmospheric equatorial jet (super-rotation). Our results have important implications for understanding the equatorial dynamics of gaseous giants. This mechanism could also help explain the equatorial westward jets (sub-rotation) observed on Uranus and Neptune, which lack the helium rain layers. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_27591 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A Possible Mechanism to Explain the Prograde Equatorial Jet of a Jupiter-like Gaseous Giant Lian, Yuchen Duan, Pengshuo Kong, Dali Earth and Planetary Astrophysics Gaseous giants are characterized by their deep atmospheres, which lack clear boundaries with their interiors; therefore, their internal states could directly influence atmospheric dynamics. So far, most modeling studies have considered deep convection as the primary mechanism by which the interior influences atmospheric dynamics. In this work, we propose another possible mechanism that might crucially determine the appearance of gaseous giants' atmospheric cloud-top jet winds, tracing them to a typical hydromagnetic wave (the so-called equatorial Magnetic-Archimedes-Coriolis wave) generated within the stably stratified, strongly magnetized helium rain layer. The associated thermal perturbations can propagate upward through the convective molecular hydrogen envelope, eventually affecting the atmospheric thermal structure - the zonal inhomogeneities that are conducive to the formation of the eastward atmospheric equatorial jet (super-rotation). Our results have important implications for understanding the equatorial dynamics of gaseous giants. This mechanism could also help explain the equatorial westward jets (sub-rotation) observed on Uranus and Neptune, which lack the helium rain layers. |
| title | A Possible Mechanism to Explain the Prograde Equatorial Jet of a Jupiter-like Gaseous Giant |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2603.27591 |