High-Latitude Convection Patterns For Various Large-Scale Field-Aligned Current Configurations
1991 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 18, no 4, 717-720 p.Article in journal (Refereed) Published
The large-scale field-aligned current system for persistent northward interplanetary magnetic field (IMF) is typically different from that for persistent southward IMF. One characteristic difference is that for northward IMF there is often a large-scale field-aligned current system poleward of the main auroral oval. This current system (the NBZ current) typically occupies a large fraction of the region poleward of the region 1 and 2 currents. The present paper models the high-latitude convection as a function of the large-scale field-aligned currents. In particular, a possible evolution of the convection pattern as the current system changes from a typical configuration for southward IMF to a configuration representing northward IMF (or vice versa) is presented. Depending on additional assumptions, for example about the y-component of the IMF, the convection pattern could either turn directly from a two-cell type to a four-cell type, or a three-cell type pattern could show up as an intermediate state. An interesting although rather surprising result of this study is that different ways of balancing the NBZ currents has a minor influence on the large-scale convection pattern.
Place, publisher, year, edition, pages
1991. Vol. 18, no 4, 717-720 p.
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-39289DOI: 10.1029/91GL00125ISI: A1991FG82800036OAI: oai:DiVA.org:kth-39289DiVA: diva2:439769
NR 201408042011-09-092011-09-092012-03-19Bibliographically approved