AGU期刊一周Research Spotlight
AGU发布最新Editor's Highlight和国外工作学习机会(Aug 16~Aug 23, 2019)
时间:2019年08月22日 10:28来源:www.3522com 点击数:

Newly Discovered Electric Current System Very Close to Saturn

In the tightly confined region between the innermost ring and the planet’s upper atmosphere, the Cassini spacecraft observed signatures of a previously undetected current system.

SOURCE:Journal of Geophysical Research: Space Physics



The left panel shows two Cassini spacecraft “Grand Finale” orbit trajectories cutting between the planet’s upper atmosphere (light orange region) and the ring regions (blue shaded regions, and their magnetic mapping to the planet). The right panel is a close-up of the space inside of the D ring, with arrows showing the newly identified current system flow. Credit: Hunt et al. [2019], Figure 1

At the end of its mission life, the orbit of the Cassini spacecraft was positioned to move ever closer to the planet, in what are known as the Grand Finale orbits. Nearly two dozen times, it squeezed between the innermost ring and the planet, continuing to make observations until its very last moments.

Using data from these orbits, Hunt et al. [2019] reveal a previously undetected electric current system deep in Saturn’s rings. They also construct a reasonable hypothesis for how it is connected to the planet’s upper atmosphere. The “closure currents” in the ionosphere are comparable in size those in the auroral zone, which close field-aligned currents from the outer reaches of Saturn’s space environment. That is, this is substantial current system, but it is so close to the planet that it went undetected until these final orbits of the Cassini mission that sent the spacecraft inside the planetary rings.

Citation: Hunt, G. J., Cowley, S. W. H., Provan, G., Cao, H., Bunce, E. J., Dougherty, M. K., & Southwood, D. J. [2019]. Currents associated with Saturn’s intra‐D ring azimuthal field perturbations. Journal of Geophysical Research: Space Physics, 124. https://doi.org/10.1029/2019JA026588

—Mike Liemohn, Editor-in-Chief, JGR: Space Physics


1. Assistant Professor of Marine Science

Eckerd College, Marine Science Discipline logo

St. Petersburg, Florida

Eckerd College, Marine Science Discipline


2. Professor of Earth and Planetary Sciences

Washington University logo

Washington University in Saint Louis

Salary commensurate with experience

Washington University


3. Air Force Science & Technology Fellowship Program

United States

National Academies of Sciences, Engineering, and Medicine


4. Earth Research Scientist (career-track)

Lawrence Berkeley National Laboratory logo

Berkeley, California (US)

Lawrence Berkeley National Laboratory


5. PhD Studentships in Hydrogeology of Faults

Flinders University, College of Science and Engineering logo

Perth or Adelaide, Australia

Tax free scholarships of up to $37,000 per year plus opportunities for international travel.

Flinders University, College of Science and Engineering



地 址:北京大学廖凯原楼5层 511

邮 编:100871

电 话:010-62752344

传 真:010-62752344

邮 箱:pkuocean@pku.edu.cn

版权所有 strong>www.3522com_葡京集团-[官方网站] Copyright by ocean.pku.edu.cn @2017, All Rights Reserved.

XML 地图 | Sitemap 地图