Header

UZH-Logo

Maintenance Infos

Measurement of Jupiter’s asymmetric gravity field


Iess, L; Folkner, W M; Durante, D; Parisi, M; Kaspi, Y; et al; Helled, R (2018). Measurement of Jupiter’s asymmetric gravity field. Nature, 555(7695):220-222.

Abstract

The gravity harmonics of a fluid, rotating planet can be decomposed into static components arising from solid-body rotation and dynamic components arising from flows. In the absence of internal dynamics, the gravity field is axially and hemispherically symmetric and is dominated by even zonal gravity harmonics J2n that are approximately proportional to qn, where q is the ratio between centrifugal acceleration and gravity at the planet’s equator1. Any asymmetry in the gravity field is attributed to differential rotation and deep atmospheric flows. The odd harmonics, J3, J5, J7, J9 and higher, are a measure of the depth of the winds in the different zones of the atmosphere2,3. Here we report measurements of Jupiter’s gravity harmonics (both even and odd) through precise Doppler tracking of the Juno spacecraft in its polar orbit around Jupiter. We find a north–south asymmetry, which is a signature of atmospheric and interior flows. Analysis of the harmonics, described in two accompanying papers4,5, provides the vertical profile of the winds and precise constraints for the depth of Jupiter’s dynamical atmosphere.

Abstract

The gravity harmonics of a fluid, rotating planet can be decomposed into static components arising from solid-body rotation and dynamic components arising from flows. In the absence of internal dynamics, the gravity field is axially and hemispherically symmetric and is dominated by even zonal gravity harmonics J2n that are approximately proportional to qn, where q is the ratio between centrifugal acceleration and gravity at the planet’s equator1. Any asymmetry in the gravity field is attributed to differential rotation and deep atmospheric flows. The odd harmonics, J3, J5, J7, J9 and higher, are a measure of the depth of the winds in the different zones of the atmosphere2,3. Here we report measurements of Jupiter’s gravity harmonics (both even and odd) through precise Doppler tracking of the Juno spacecraft in its polar orbit around Jupiter. We find a north–south asymmetry, which is a signature of atmospheric and interior flows. Analysis of the harmonics, described in two accompanying papers4,5, provides the vertical profile of the winds and precise constraints for the depth of Jupiter’s dynamical atmosphere.

Statistics

Citations

Dimensions.ai Metrics
25 citations in Web of Science®
29 citations in Scopus®
Google Scholar™

Altmetrics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:7 March 2018
Deposited On:01 Mar 2019 15:13
Last Modified:17 Sep 2019 19:39
Publisher:Nature Publishing Group
ISSN:0028-0836
OA Status:Closed
Publisher DOI:https://doi.org/10.1038/nature25776

Download

Full text not available from this repository.
View at publisher

Get full-text in a library