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dc.contributor.authorGarcia, Odd Erik
dc.contributor.authorLeer, Egil
dc.contributor.authorPecseli, Hans
dc.contributor.authorTrulsen, Jan Karsten
dc.date.accessioned2016-03-07T09:59:13Z
dc.date.available2016-03-07T09:59:13Z
dc.date.issued2015-03-03
dc.description.abstractAnalytical models are presented for currents along vertical magnetic field lines due to slow bulk electron motion in plasmas subject to a gravitational force. It is demonstrated that a general feature of this problem is a singularity in the plasma pressure force that develops at some finite altitude when a plasma that is initially in static equilibrium is set into slow motion. Classical fluid models thus do not allow general steady-state solutions for field-aligned currents. General solutions have to be non-stationary, varying on time scales of many periods of a plasma equivalent to the Brunt–Väisälä frequency. Except for very special choices of parameters, a steady-state solution exists only in an average sense. The conditions at large altitudes turn out to be extremely sensitive to even small changes in parameters at low altitudes. Low frequency fluctuations detected at large altitudes in the polar regions need not be caused by local low frequency instabilities, but merely reflect small fluctuations in conditions at low altitudes.en_US
dc.descriptionPublished version. Source at <a href=http://doi.org/10.5194/angeo-33-257-2015>http://doi.org/10.5194/angeo-33-257-2015</a>.en_US
dc.identifier.citationAnnales Geophysicae 2015, 33(3):257-266en_US
dc.identifier.cristinIDFRIDAID 1233479
dc.identifier.doi10.5194/angeo-33-257-2015
dc.identifier.issn0992-7689
dc.identifier.urihttps://hdl.handle.net/10037/8717
dc.identifier.urnURN:NBN:no-uit_munin_8289
dc.language.isoengen_US
dc.publisherCopernicus Publicationsen_US
dc.rights.accessRightsopenAccess
dc.subjectIonosphere (electric fields and currents)en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437en_US
dc.subjectVDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437en_US
dc.titleMagnetic field-aligned plasma currents in gravitational fieldsen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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