Space Technology 5 multipoint observations of transpolar arc related field-aligned currents
2011 (English)In: Journal of Geophysical Research - Space Physics, ISSN 0148-0227, Vol. 116Article in journal (Refereed) Published
We present two transpolar arc events where for the first time we are able to analyze changes in field-aligned currents associated with high-latitude transpolar auroral arcs on time scales of a few minutes. This is accomplished through the use of highly accurate multipoint magnetic field measurements provided by the Space Technology 5 mission, which consists of three microsatellites in low-Earth orbit. In the first event we examine measurements of an arc that is part of a highly dynamic auroral pattern, that of a hook-shaped arc. In the second event, a more stable dusk oval-aligned arc is analyzed. These events illustrate the dynamic nature of arc formation and show the usefulness of high-resolution multipoint measurements. Minimum variance analysis is used to determine the appropriateness of the infinite current sheet approximation and to calculate arc alignment angles which are then compared with those estimated from UV images or precipitating particle data.
Place, publisher, year, edition, pages
2011. Vol. 116
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-93367DOI: 10.1029/2010JA015912ISI: 000287812500001OAI: oai:DiVA.org:kth-93367DiVA: diva2:515750
QC 201206272012-04-152012-04-152012-06-27Bibliographically approved