On the Radial and Longitudinal Variation of a Magnetic Cloud : ACE, Wind, ARTEMIS and Juno Observations

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dc.contributor.author Davies, Emma E.
dc.contributor.author Forsyth, Robert J.
dc.contributor.author Good, Simon W.
dc.contributor.author Kilpua, Emilia K. J.
dc.date.accessioned 2020-12-17T13:39:01Z
dc.date.available 2020-12-17T13:39:01Z
dc.date.issued 2020-11-10
dc.identifier.citation Davies , E E , Forsyth , R J , Good , S W & Kilpua , E K J 2020 , ' On the Radial and Longitudinal Variation of a Magnetic Cloud : ACE, Wind, ARTEMIS and Juno Observations ' , Solar Physics , vol. 295 , no. 11 , 157 . https://doi.org/10.1007/s11207-020-01714-z
dc.identifier.other PURE: 157661968
dc.identifier.other PURE UUID: ca0750e7-c1b7-4d18-996c-19733b6b8e09
dc.identifier.other WOS: 000593854700003
dc.identifier.other ORCID: /0000-0002-4489-8073/work/85519991
dc.identifier.other ORCID: /0000-0002-4921-4208/work/85521396
dc.identifier.uri http://hdl.handle.net/10138/323356
dc.description.abstract We present observations of the same magnetic cloud made near Earth by the Advance Composition Explorer (ACE), Wind, and the Acceleration, Reconnection, Turbulence and Electrodynamics of the Moon's Interaction with the Sun (ARTEMIS) mission comprising the Time History of Events and Macroscale Interactions during Substorms (THEMIS) B and THEMIS C spacecraft, and later by Juno at a distance of 1.2 AU. The spacecraft were close to radial alignment throughout the event, with a longitudinal separation of 3.6 degrees between Juno and the spacecraft near Earth. The magnetic cloud likely originated from a filament eruption on 22 October 2011 at 00:05 UT, and caused a strong geomagnetic storm at Earth commencing on 24 October. Observations of the magnetic cloud at each spacecraft have been analysed using minimum variance analysis and two flux rope fitting models, Lundquist and Gold-Hoyle, to give the orientation of the flux rope axis. We explore the effect different trailing edge boundaries have on the results of each analysis method, and find a clear difference between the orientations of the flux rope axis at the near-Earth spacecraft and Juno, independent of the analysis method. The axial magnetic field strength and the radial width of the flux rope are calculated using both observations and fitting parameters and their relationship with heliocentric distance is investigated. Differences in results between the near-Earth spacecraft and Juno are attributed not only to the radial separation, but to the small longitudinal separation which resulted in a surprisingly large difference in the in situ observations between the spacecraft. This case study demonstrates the utility of Juno cruise data as a new opportunity to study magnetic clouds beyond 1 AU, and the need for caution in future radial alignment studies. en
dc.format.extent 25
dc.language.iso eng
dc.relation.ispartof Solar Physics
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject Coronal mass ejections
dc.subject interplanetary
dc.subject Magnetic clouds
dc.subject Multi-spacecraft observations
dc.subject Radial evolution
dc.subject Longitudinal variation
dc.subject Juno
dc.subject SOLAR-WIND
dc.subject FLUX ROPES
dc.subject EARTH
dc.subject SIGNATURES
dc.subject EVOLUTION
dc.subject MULTIPLE
dc.subject 115 Astronomy, Space science
dc.title On the Radial and Longitudinal Variation of a Magnetic Cloud : ACE, Wind, ARTEMIS and Juno Observations en
dc.type Article
dc.contributor.organization Particle Physics and Astrophysics
dc.contributor.organization Space Physics Research Group
dc.contributor.organization Department of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1007/s11207-020-01714-z
dc.relation.issn 0038-0938
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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