Journal article
Juno Witnesses Extreme Compression of Jupiter's Magnetosphere
Journal of geophysical research : Space physics (2013 - Present), Vol.131(4), e2025JA034955
04/01/2026
DOI: 10.1029/2025JA034955
Abstract
In October 2024, the Juno spacecraft observed an extreme compression of Jupiter's magnetosphere. This event pushed the magnetosheath into an unprecedented distance of only 30 Jupiter radii from Jupiter. This suggests an enhanced Solar Wind (SW) dynamic pressure (DynP), that was likely produced from a coronal mass ejection after an X1.8 class solar flare. The compression brought the magnetosheath, observed at a high southern latitude, to the closest distance ever observed from Jupiter. Using data from multiple instruments on Juno to identify magnetosheath signatures, it is shown that Juno had many encounters with the magnetosheath as it moved inward from apojove to perijove. This included many short-lived encounters that were not readily identifiable from a single data set. From model estimates, a SW DynP of around 1.2 is suggested for this event, consistent with previous upper estimates observed in the vicinity of Jupiter's orbital path. Remote imaging suggests the magnetosphere remained compressed for several days after this event. The event raises the possibility that Jupiter's magnetosphere on the dayside could potentially shrink inside of Callisto's orbital path, and that if Callisto happened to be on the dayside of Jupiter at the time (although it was on the nightside during this event), it could find itself outside of the jovian magnetosphere and exposed directly to the SW.
Details
- Title: Subtitle
- Juno Witnesses Extreme Compression of Jupiter's Magnetosphere
- Creators
- R. J. Wilson - University of Colorado BoulderF. Bagenal - University of Colorado BoulderM. J. Brennan - Jet Propulsion LaboratoryJ. E.P. Connerney - Goddard Space Flight CenterS. Eriksson - University of Colorado BoulderR. S. Giles - Southwest Research InstituteT. K. Greathouse - Southwest Research InstituteW. S. Kurth - University of IowaC. P. Paranicas - Johns Hopkins University Applied Physics LaboratoryR. Ramstad - University of Colorado BoulderM. J. Rutala - Dublin Institute For Advanced StudiesM. F. Vogt - Planetary Science InstituteG. J. Fuller - University of Colorado BoulderF. Allegrini - Southwest Research InstituteR. W. Ebert - Southwest Research Institute
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research : Space physics (2013 - Present), Vol.131(4), e2025JA034955
- DOI
- 10.1029/2025JA034955
- ISSN
- 2169-9380
- eISSN
- 2169-9402
- Publisher
- Wiley
- Grant note
- University of Iowa (http://data.elsevier.com/vocabulary/SciValFunders/100008893) 072525_SH_1 / Connecticut Children's Medical Center (http://data.elsevier.com/vocabulary/SciValFunders/100019707) University of Colorado (http://data.elsevier.com/vocabulary/SciValFunders/100010174) 699041X / Southwest Research Institute (http://data.elsevier.com/vocabulary/SciValFunders/100011766) 18/FRL/6199 / Roy J. Carver Charitable Trust (http://data.elsevier.com/vocabulary/SciValFunders/100001024) 699050X / National Aeronautics and Space Administration (http://data.elsevier.com/vocabulary/SciValFunders/100000104)
- Language
- English
- Date published
- 04/01/2026
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9985153391002771
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