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A Method to Estimate the Physical Properties of Magnetospheric Generators From Observations of Quiet Discrete Auroral Arcs
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2019 (Engelska)Ingår i: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402Artikel i tidskrift (Refereegranskat) Epub ahead of print
Abstract [en]

We discuss a method to estimate the properties of a magnetospheric generator using a quasi-electrostatic magnetosphere-ionosphere coupling model and in situ or remote sensing observations of discrete quiet arcs. We first construct an ensemble of Vlasov equilibrium solutions for generator structures formed at magnetospheric plasma interfaces. For each generator solution, we compute the ionospheric electric potential from the current continuity equation. Thus, we estimate the field-aligned potential drop that allows us to assess several properties of the discrete auroral arc, such as the field-aligned potential difference, the field-aligned current density, the flux of precipitating energy, and the height-integrated Pedersen conductance. A minimization procedure based on comparing the numerical results with observations is defined and applied to find which solution of the current continuity equation and which generator model give auroral arc properties that best fit the observations. The procedure is validated in a case study with observations by DMSP and Cluster and can be generalized to other types of data.

Ort, förlag, år, upplaga, sidor
American Geophysical Union (AGU), 2019.
Nyckelord [en]
quiet auroral arcs, magnetosphere-ionosphere coupling, magnetospheric plasma interfaces, field-aligned currents, Vlasov equilibrium
Nationell ämneskategori
Fusion, plasma och rymdfysik Astronomi, astrofysik och kosmologi
Identifikatorer
URN: urn:nbn:se:umu:diva-167089DOI: 10.1029/2019JA026969ISI: 000504543100001OAI: oai:DiVA.org:umu-167089DiVA, id: diva2:1384158
Tillgänglig från: 2020-01-09 Skapad: 2020-01-09 Senast uppdaterad: 2020-01-09

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Gunell, Herbert

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Journal of Geophysical Research - Space Physics
Fusion, plasma och rymdfysikAstronomi, astrofysik och kosmologi

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