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Space Technology 5 multipoint observations of transpolar arc related field-aligned currents
Center for Space Sciences, University of Texas at Dallas, Richardson, TX .
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2011 (Engelska)Ingår i: Journal of Geophysical Research - Space Physics, ISSN 0148-0227, Vol. 116Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

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.

Ort, förlag, år, upplaga, sidor
2011. Vol. 116
Nationell ämneskategori
Fusion, plasma och rymdfysik
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URN: urn:nbn:se:kth:diva-93367DOI: 10.1029/2010JA015912ISI: 000287812500001OAI: oai:DiVA.org:kth-93367DiVA, id: diva2:515750
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QC 20120627Tillgänglig från: 2012-04-15 Skapad: 2012-04-15 Senast uppdaterad: 2012-06-27Bibliografiskt granskad

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Cumnock, Judy A.
Fusion, plasma och rymdfysik

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