Transport of Ionospheric up‐Flowing O+ ION along the Field Line at Various Longitude to the Magnetosphere

Abstract

AbstractAccording to ion's distribution function found from the dynamic equation, the static flux distribution of the up‐flowing O+ ion originating from various ionospheric regions along the field line at various longitude and the ion transport features are studied. The results show that: (1) The ions originating from the equatorial side of the dayside auroral zone and lower latitude region mainly transport into dayside magnetospheric region. The ions originating from the polar gap and polar side of the dayside auroral zone mainly transport into the magnetomantle and lob. The ions originating from equatorial side of the nightside auroral zone and lower latitude region mainly transport into the plasmasheet and the closed field line region. (2) The ionospheric up‐flowing ions mainly distribute in near geo‐space and ion's flux has a negative gradient versus geo‐center distance. (3) If Kp is higher, the probability of the up‐flowing ions to entry the magnetosphere will be bigger and the region where the up‐flowing ions are dominant will be bigger. Our theoretical results can interpret some features of the geopause, and the theoretical flux of the ion in the magnetotail is consistent with the observation.