Change search
ReferencesLink to record
Permanent link

Direct link
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
URN: urn:nbn:se:kth:diva-167765DOI: 10.1002/2014JA020937ISI: 000353237600028ScopusID: 2-s2.0-84927734000OAI: diva2:814595

QC 20150527

Available from: 2015-05-27 Created: 2015-05-22 Last updated: 2015-08-05Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Karlsson, Tomas
By organisation
Space and Plasma Physics
In the same journal
Journal of Geophysical Research - Space Physics
Astronomy, Astrophysics and Cosmology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 25 hits
ReferencesLink to record
Permanent link

Direct link