Magnetospheric‐Ionospheric‐Atmospheric Implications From the Juno Flyby of Ganymede

Author:

Waite J. H.1ORCID,Greathouse T. K.2ORCID,Carberry Mogan S. R.3,Sulaiman A. H.4ORCID,Valek P.2ORCID,Allegrini F.2ORCID,Ebert R. W.2ORCID,Gladstone G. R.2ORCID,Kurth W. S.5ORCID,Connerney J. E. P.6ORCID,Clark G.7ORCID,Bagenal F.8ORCID,Duling S.9ORCID,Romanelli N.1011ORCID,Bolton S.2ORCID,Vorburger A.12ORCID,Paranicas C.7ORCID,Kollmann P.7ORCID,Mauk B.7ORCID,Hansen C.13ORCID,Buccino D.14ORCID,Johnson R. E.15ORCID,Wilson R. J.8ORCID,Teolis B.2ORCID

Affiliation:

1. Waite Science LLC Pensacola FL USA

2. Division of Space Science and Engineering Southwest Research Institute San Antonio TX USA

3. Space Sciences Laboratory University of California Berkeley Berkeley CA USA

4. School of Physics and Astronomy Minnesota Institute for Astrophysics University of Minnesota Minneapolis MN USA

5. Physics and Astronomy University of Iowa Iowa City IA USA

6. Space Research Corporation Annapolis MD USA

7. Johns Hopkins Applied Physics Laboratory Laurel MD USA

8. Laboratory for Atmospheric and Space Physics University of Colorado Boulder CO USA

9. University of Cologne Institute for Geophysics and Meteorology Cologne Germany

10. Department of Astronomy University of Maryland College Park MD USA

11. NASA Goddard Space Flight Center Greenbelt MD USA

12. Physics Institute University of Bern Bern Switzerland

13. Planetary Science Institute Tucson AZ USA

14. Jet Propulsion Laboratory NASA Pasadena CA USA

15. University of Virginia Charlottesville VA USA

Abstract

AbstractJuno flew over the northern mid‐latitudes of Ganymede during orbit 34 of the Juno mission, reaching an altitude of 1,053 km (16:56:07.972 UTC) at a sub spacecraft latitude/longitude of 33.66N, 57.5W degrees on 7 June 2021. Between 16:43 and 17:02 UT, Juno pierced Ganymede's magnetosphere at a velocity relative to Ganymede of 18.57 km s−1. Juno's instrumentation provided a unique opportunity to sample the local environment of Ganymede and its magnetosphere. We present measurements of the composition of the polar ionospheric outflow and the energetic electrons that penetrate Ganymede's atmosphere and produce its aurora. When these new observations are combined with modeling, conclusions can be drawn that affect our understanding of the atmosphere of Ganymede. The measured JADE precipitating plasma electrons provide an energy flux beyond that needed to create the observed oxygen emissions measured by UVS, but the electron energy spectrum is optically thin to the sparse atmosphere and does not provide the observed oxygen ultraviolet emission unless the O2 column density is increased by over an order of magnitude compared to previous atmospheric models. More than 99% of the electron energy flux passes through the atmosphere into the ice, thereby increasing the H2 and O2 content of the atmosphere. The increased H2 and O2 production is largely responsible for increasing the oxygen column density to a level that produces within known uncertainties the OI135.6 and OI130.4 nm emissions when bombarded by the electron energy flux observed by JADE. This suggests that past modeling efforts have underestimated the density of the atmosphere by over an order of magnitude.

Publisher

American Geophysical Union (AGU)

Reference89 articles.

1. Plasma Observations During the 7 June 2021 Ganymede Flyby From the Jovian Auroral Distributions Experiment (JADE) on Juno

2. Ansher J. A. Barnhardt B. L. Richards B. H. Gurnett D. A. &Kurth W. S. (2017).GO‐J‐PWS‐5‐DDR‐PLASMA DENSITY Galileo Jupiter pus derived plasma density full res v1.0 [Dataset].NASA Planetary Data System. https://doi.org/10.17189/1519684

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3