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Magnetospheric signatures of ionospheric density cavities observed by Cluster
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0003-1270-1616
2015 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 120, no 3, 1876-1887 p.Article in journal (Refereed) Published
Abstract [en]

We present Cluster measurements of large amplitude electric fields correlated with intense downward field-aligned currents, observed during a nightside crossing of the auroral zone. The data are reproduced by a simple model of magnetosphere-ionosphere coupling which, under different conditions, can also produce a divergent electric field signature in the downward current region, or correlation between the electric and perturbed magnetic fields. We conclude that strong electric field associated with intense downward field-aligned current, such as this observation, is a signature of ionospheric plasma depletion caused by the downward current. It is also shown that the electric field in the downward current region correlates with downward current density if a background field is present, e.g., due to magnetospheric convection. Key Points Correlated electric field and downward current density seen in Cluster data The signature is reproduced in a model of magnetosphere-ionosphere coupling It implies an ionospheric cavity embedded in a larger-scale current system

Place, publisher, year, edition, pages
2015. Vol. 120, no 3, 1876-1887 p.
Keyword [en]
Cluster satellite, ionospheric depletion, magnetosphere-ionosphere coupling
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-167765DOI: 10.1002/2014JA020937ISI: 000353237600028Scopus ID: 2-s2.0-84927734000OAI: oai:DiVA.org:kth-167765DiVA: diva2:814595
Note

QC 20150527

Available from: 2015-05-27 Created: 2015-05-22 Last updated: 2017-12-04Bibliographically approved

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Karlsson, Tomas

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