Change search
ReferencesLink to record
Permanent link

Direct link
POLAR UVI Observations of Auroral Oval Intensifications During a Transpolar Arc Event on December 7, 1996
KTH, Superseded Departments, Alfvén Laboratory.
KTH, Superseded Departments, Alfvén Laboratory.
Show others and affiliations
2000 (English)Report (Other academic)
Abstract [en]

The evolution of the northern hemisphere aurora is examined during a time when the IMF makes three brief southward excursions after a change in the sign of By during an extended period of northward IMF. POLAR UVI provides images of the aurora while DMSP F13 and F14 provide in situ measurements of precipitating particles, ionospheric plasma flows and ion density.

Three different intensifications located in the nightside auroral oval occur during northward turnings of the IMF after brief periods of southward IMF. Spatial expansion, intensity of emissions and their duration are related to the length of time the IMF is southward prior to the northward turning. Thus the longer the period of enhanced magnetospheric convection the more intense the ionospheric response. Observations of a transpolar arc indicate that when the transpolar arc reaches highest latitudes it is located on a spatially narrow region of closed field lines, which extends along the noon-midnight meridian.

UV observations indicate a connection between the transpolar arc and the nightside auroral enhancements. Precipitating particles associated with both features are attributed to a plasma sheet boundary layer source in the magnetotail implying a magnetospheric connection between the transpolar arc and the nightside auroral oval intensification.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2000. , 23 p.
Trita-ALP, ISSN 1103-6613 ; 2000-01
Keyword [en]
Auroral Physics, Magnetosphere-ionosphere Coupling, Northward IMF, Substorm, Theta Aurora, Transpolar Arc
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:kth:diva-92308OAI: diva2:513252
QC 20120530Available from: 2012-05-30 Created: 2012-04-01 Last updated: 2012-05-30Bibliographically approved

Open Access in DiVA

fulltext(442 kB)145 downloads
File information
File name FULLTEXT01.pdfFile size 442 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Cumnock, JudyBlomberg, Lars
By organisation
Alfvén Laboratory
Fusion, Plasma and Space Physics

Search outside of DiVA

GoogleGoogle Scholar
Total: 145 downloads
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

Total: 39 hits
ReferencesLink to record
Permanent link

Direct link