Statistical study of relationships between dayside high-altitude and high-latitude O+ ion outflows, solar winds, and geomagnetic activity
2005 (English)In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 23, 1909-1916 p.Article in journal (Refereed) Published
The persistent outflows of O+ ions observed by the Cluster CIS/CODIF instrument were studied statistically in the high-altitude (from 3 up to 11 RE) and high-latitude (from 70 to ~90 deg invariant latitude, ILAT) polar region. The principal results are: (1) Outflowing O+ ions with more than 1keV are observed above 10 RE geocentric distance and above 85deg ILAT location; (2) at 6-8 RE geocentric distance, the latitudinal distribution of O+ ion outflow is consistent with velocity filter dispersion from a source equatorward and below the spacecraft (e.g. the cusp/cleft); (3) however, at 8-12 RE geocentric distance the distribution of O+ outflows cannot be explained by velocity filter only. The results suggest that additional energization or acceleration processes for outflowing O+ ions occur at high altitudes and high latitudes in the dayside polar region.
Place, publisher, year, edition, pages
2005. Vol. 23, 1909-1916 p.
Magnetospheric physics, Magnetospheric configuration and dynamics, Solar wind-magnetosphere interactions
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:umu:diva-4864DOI: 10.5194/angeo-23-1909-2005OAI: oai:DiVA.org:umu-4864DiVA: diva2:144124