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Magnetic signatures of plasma‐depleted flux tubes in the Saturnian inner magnetosphere
Author(s) -
André N.,
Persoon A. M.,
Goldstein J.,
Burch J. L.,
Louarn P.,
Lewis G. R.,
Rymer A. M.,
Coates A. J.,
Kurth W. S.,
Sittler E. C.,
Thomsen M. F.,
Crary F. J.,
Dougherty M. K.,
Gurnett D. A.,
Young D. T.
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl030374
Subject(s) - magnetosphere , physics , magnetic flux , flux (metallurgy) , plasma , saturn , jovian , astrophysics , flux tube , magnetic field , geophysics , planet , chemistry , organic chemistry , quantum mechanics
Initial Cassini observations have revealed evidence for interchanging magnetic flux tubes in the inner Saturnian magnetosphere. Some of the reported flux tubes differ remarkably by their magnetic signatures, having a depressed or enhanced magnetic pressure relative to their surroundings. The ones with stronger fields have been interpreted previously as either outward moving mass‐loaded or inward moving plasma‐depleted flux tubes based on magnetometer observations only. We use detailed multi‐instrumental observations of small and large density depletions in the inner Saturnian magnetosphere from Cassini Rev. A orbit that enable us to discriminate amongst the two previous and opposite interpretations. Our analysis undoubtedly confirms the similar nature of both types of reported interchanging magnetic flux tubes, which are plasma‐depleted, whatever their magnetic signatures are. Their different magnetic signature is clearly an effect associated with latitude. These Saturnian plasma‐depleted flux tubes ultimately may play a similar role as the Jovian ones.