uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Timing of substorm onset signatures on the ground and at geostationary orbit
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.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
2002 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 29, no 12, p. 33(1)-33(4)Article in journal (Refereed) Published
Abstract [en]

In order to study the relative timing of substorm onset signatures on the ground and at geostationary orbit we have used data of simultaneous dispersionless electron and proton injections from the LANL satellite 1991-80, located slightly westward of Scandinavia. Out of 9 years of data we have identified a number of events during which such injections occurred close to local magnetic midnight. By careful inspection of ground-based magnetograms from the Scandinavian magnetometer network, IMAGE, we then identified the location and time of the formation of a substorm current wedge (SCW) during these events. 40 clear cases of geostationary injections, which were clearly associated with the formation of SCWs, were found. A statistical study of these events reveals that there is a clear time delay of the order of several minutes in the occurrence of the substorm injection with respect to the first indication of the SCW measured on the ground.

Place, publisher, year, edition, pages
2002. Vol. 29, no 12, p. 33(1)-33(4)
Keywords [en]
Europe, Scandinavia, Statistical analysis, Ion injection, Magnetosphere, Magnetospheric substorm, Delay time, Magnetogram, Proton, Electron injection, Timing
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-90581OAI: oai:DiVA.org:uu-90581DiVA, id: diva2:162982
Available from: 2003-05-15 Created: 2003-05-15 Last updated: 2017-12-14Bibliographically 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. p. 50
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 860
Keywords
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

Open Access in DiVA

No full text in DiVA

By organisation
Swedish Institute of Space Physics, Uppsala Division
In the same journal
Geophysical Research Letters
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 504 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf