Prediction of Axial Asymmetry in Jovian Magnetopause Reconnection

Author:

Chen Junjie12ORCID,Zhang Binzheng12ORCID,Lin Dong3ORCID,Delamere Peter A.4ORCID,Yao Zhonghua5ORCID,Brambles Oliver6ORCID,Sorathia Kareem A.7ORCID,Merkin Viacheslav G.7ORCID,Lyon John G.8ORCID

Affiliation:

1. Department of Earth Sciences The University of Hong Kong Pokfulam China

2. Laboratory for Space Research The University of Hong Kong Pokfulam China

3. High Altitude Observatory The National Center for Atmospheric Research Boulder CO USA

4. Geophysical Institute University of Alaska Fairbanks Fairbanks AK USA

5. Key Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China

6. O.J. Brambles Consulting Preston UK

7. Applied Physics Laboratory Johns Hopkins University Laurel MD USA

8. Department of Physics and Astronomy Dartmouth College Hanover NH USA

Abstract

AbstractWe show the possible existence of a significant axial asymmetry in the reconnection separator at the Jovian magnetopause using first‐principle, physics‐based global simulations. Under eastward interplanetary magnetic field (IMF) conditions near Jupiter's orbit, reconnection occurs at the southern‐dusk and northern magnetopause with large shear angles between the magnetospheric and magnetosheath magnetic fields. When driven by the westward IMF, the reconnection position switches to the northern‐dusk and southern magnetopause. Component reconnection at the southern‐dusk/northern‐dusk magnetopause is associated with the interaction of the IMF with the nearly‐dipolar background fields. Nearly‐antiparallel reconnection near the noon‐midnight plane at the northern/southern magnetopause is related to the dawn‐dusk asymmetric, helical, closed lobe magnetic fields, which is a consequence of significant planetary corotation effects and not expected at Earth. Such configuration is testable as Juno has proceeded its orbit to the high‐altitude cusps and provides new insight into the interpretation of measurements from other rotationally‐driven systems.

Publisher

American Geophysical Union (AGU)

Subject

General Earth and Planetary Sciences,Geophysics

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