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Correlation between ground-based observations of substorm signatures and magnetotail dynamics
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
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2005 (English)In: Annales Geophysicae, ISSN 0992-7689, Vol. 23, 997-1011 p.Article in journal (Refereed) Published
Abstract [en]

We present a substorm event study combining Cluster and ground-based instrumentation. For this event ground-based magnetograms show a substorm onset and two separate substorm intensifications over Scandinavia, at the time located in the pre-midnight sector. During the substorm Cluster is located in the southern plasma sheet at a downtail distance of 18.5 Re. For all the substorm signatures seen on ground, corresponding plasma sheet drop-outs and re-entries of all or individual spacecraft of the Cluster constellation are observed. In general, plasma sheet drop-outs are assumed to be due to plasma sheet thinning/thickening and/or to magnetotail flapping. However, in the literature there has been some disagreement on both spatial and temporal characteristics of plasma sheet thinning and thickening during substorms. We therefore investigate the causes for the plasma sheet drop-outs for this event, which at first glance appears to show plasma sheet thinning at substorm onset, contradictory to the present standpoint in the literature.

Place, publisher, year, edition, pages
2005. Vol. 23, 997-1011 p.
Keyword [en]
Magnetospheric configuration and dynamics, Magnetotail, Plasma sheet, Storms and substorms
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-90583OAI: oai:DiVA.org:uu-90583DiVA: diva2:162984
Available from: 2003-05-15 Created: 2003-05-15 Last updated: 2009-11-18Bibliographically approved
In thesis
1. Substorm Features in the High-Latitude Ionosphere and Magnetosphere: Multi-Instrument Observations
Open this publication in new window or tab >>Substorm Features in the High-Latitude Ionosphere and Magnetosphere: Multi-Instrument Observations
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The space around Earth, confined in the terrestrial magnetosphere, is to some extent shielded from the Sun's solar wind plasma and magnetic field. During certain conditions, however, strong interaction can occur between the solar wind and the magnetosphere, resulting in magnetospheric activity of several forms, among which substorms and storms are the most prominent. A general framework for how these processes work have been outlayed through the history of research, however, there still remain questions to be answered. The most striking example regards the onset of substorms, where both the onset cause and location in the magnetosphere/ionosphere are still debated. These are clearly not easily solved problems, since a substorm is a global process, ideally requiring simultaneous measurements in the magnetotail and ionosphere. Investigated in this work are temporal and spatial scales for substorm and convection processes in the Earth's magnetosphere and ionosphere. This is performed by combining observations from a number of both ground-based and spacecraft-borne instruments. The observations indicate that the magnetotail's cross-section is involved to a larger spatial extent than previously considered in the substorm process. Furthermore, convection changes result in topological changes of the magnetosphere on a fast time scale. The results show that the magnetosphere is, on a global magnetospheric scale, highly dynamic during convection changes and ensuing substorms.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2003. 50 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 860
Keyword
Space and plasma physics, Substorm, Convection, magnetosphere-ionosphere coupling, Rymd- och plasmafysik
National Category
Fusion, Plasma and Space Physics
Research subject
Space and Plasma Physics
Identifiers
urn:nbn:se:uu:diva-3478 (URN)91-554-5670-7 (ISBN)
Public defence
2003-06-05, Polhem, Ångström, Uppsala, 14:00 (English)
Opponent
Supervisors
Available from: 2003-05-15 Created: 2003-05-15 Last updated: 2009-11-18Bibliographically approved

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