Statistical analysis of the sources of the cross-polar potential for southward IMF, based on particle precipitation characteristics
2008 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 35, no 8, L08103- p.Article in journal (Refereed) Published
There are several proposed physical processes which may contribute to the cross-polar potential and thus drive ionospheric convection around the polar caps. It is generally believed that magnetic reconnection is the dominant process, however dynamos such as viscous interaction and impulsive penetration are other possible contributors. A comprehensive statistical study has been conducted using data from the DMSP F13 satellite for passages along the northern hemisphere dawn-dusk meridian, with focus on typical two-cell convection patterns during times of steady southward IMF conditions. The results show that the low-latitude dynamo (viscous interaction or reconnection in the LLBL) on average accounts for only 1–2 kV of the total potential drop, values lower than those previously predicted. At rare occasions this dynamo can be a significant source of energy, however, contributing to more than 20 kV of the cross-polar potential.
Place, publisher, year, edition, pages
2008. Vol. 35, no 8, L08103- p.
Astrophysics, Atmospherics, Electric generators, Energy management, Flow interactions, Geophysics, Hypersonic flow, Interactive devices, Magnetic fields, Magnetism, Precipitation (chemical), Statistical methods, Theorem proving
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-10246DOI: 10.1029/2008GL033383ISI: 000255458700005ScopusID: 2-s2.0-48249140716OAI: oai:DiVA.org:kth-10246DiVA: diva2:212466
QC 201010292009-04-222009-04-222011-04-05Bibliographically approved