Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm31a0395z&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SM31A-0395
Physics
2431 Ionosphere/Magnetosphere Interactions (2736), 2736 Magnetosphere/Ionosphere Interactions (2431), 2744 Magnetotail, 2784 Solar Wind/Magnetosphere Interactions, 2790 Substorms
Scientific paper
The ionosphere provides an important source for the magnetospheric plasmas,the transport rate can be up to 1kg/s . The effects of such high flux upflowing ions on the composition and dynamics of the magnetosphere have not been unclearly understood yet. One of the unsolved key problems is if the ion up-flow can really trigger the substorm expansion onset. A 3-D resistive MHD simulation is carried out to study the effect of the ion up-flow on the dynamic process in the magnetotail. The whole work is divided into three parts: 1: The effects of the ion up-flow originated from the night-side auroral oval on the near-Earth magnetotail during the quiet time; 2: The effects of the convection electric field on the dynamic process of the magnetotail, especially on the substorm growth phase and the expansion onset process; 3: The effects of the ion up-flow on the substorm processes, in particular on the initiation of the substorm expansion phase. Our simulation results showed that the reasonable field-aligned current (FAC) pattern (such as the region I- and region II-like FACs) appears only with the interaction of the up-flow ions and the convection electric field. Furthermore, the interaction of the up-flow ions and the convection electric field results in non-linear enhancements of the FAC. We also made a calculation of the FACs in the late growth phase and at the substorm onset based on simultaneous magnetic field measurements by Cluster four-spacecraft, and compared their characteristic features with the simulation result. Pronounced similarities in time scale and intensity profile are found. This indicates that the up-flow ions during the late growth-phase can induce the sudden enhancement of the FAC and lead to the disruption of the cross-tail current, and hence play a role in triggering the substorm expansion onset.
Liu Zhenxing
Zhang Lianchang
No associations
LandOfFree
The Substorm Expansion Phase Triggered by the Up-flow Ions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Substorm Expansion Phase Triggered by the Up-flow Ions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Substorm Expansion Phase Triggered by the Up-flow Ions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-762770