Juno spacecraft gravity measurements provide evidence for normal modes of Jupiter

被引:21
作者
Durante, Daniele [1 ]
Guillot, Tristan [2 ]
Iess, Luciano [1 ]
Stevenson, David J. [3 ]
Mankovich, Christopher R. [3 ]
Markham, Steve [2 ]
Galanti, Eli [4 ]
Kaspi, Yohai [4 ]
Zannoni, Marco [5 ]
Casajus, Luis Gomez [5 ]
Lari, Giacomo [6 ]
Parisi, Marzia [7 ]
Buccino, Dustin R. [7 ]
Park, Ryan S. [7 ]
Bolton, Scott J. [8 ]
机构
[1] Sapienza Univ Rome, Dept Mech & Aerosp Engn, Rome, Italy
[2] Univ Cote dAzur, Observ Cote dAzur, CNRS, Nice, France
[3] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA
[4] Weizmann Inst Sci, Dept Earth & Planetary Sci, Rehovot, Israel
[5] Univ Bologna, Dept Ind Engn, Forli, Italy
[6] Univ Pisa, Dept Math, Pisa, Italy
[7] CALTECH, Jet Prop Lab, Pasadena, CA USA
[8] Southwest Res Inst, San Antonio, TX USA
关键词
KRONOSEISMOLOGY; SATURN; WAVES;
D O I
10.1038/s41467-022-32299-9
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The Juno spacecraft has been collecting data to shed light on the planet's origin and characterize its interior structure. The onboard gravity science experiment based on X-band and Ka-band dual-frequency Doppler tracking precisely measured Jupiter's zonal gravitational field. Here, we analyze 22 Juno's gravity passes to investigate the gravity field. Our analysis provides evidence of new gravity field features, which perturb its otherwise axially symmetric structure with a time-variable component. We show that normal modes of the planet could explain the anomalous signatures present in the Doppler data better than other alternative explanations, such as localized density anomalies and non-axisymmetric components of the static gravity field. We explain Juno data by p-modes having an amplitude spectrum with a peak radial velocity of 10-50 cm/s at 900-1200 mu Hz (compatible with ground-based observations) and provide upper bounds on lower frequency f-modes (radial velocity smaller than 1 cm/s). The new Juno results could open the possibility of exploring the interior structure of the gas giants through measurements of the time-variable gravity or with onboard instrumentation devoted to the observation of normal modes, which could drive spacecraft operations of future missions. Juno spacecraft experienced unknown accelerations near the closest approach to Jupiter. Here, the authors show that Jupiter's axially symmetric, north-south asymmetric gravity field measured by Juno is perturbed by a time-variable component, associated to internal oscillations.
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收藏
页数:8
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