Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm32b..07y&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM32B-07
Physics
[2723] Magnetospheric Physics / Magnetic Reconnection, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2753] Magnetospheric Physics / Numerical Modeling
Scientific paper
The influence of ionospheric heavy ions (O+) outflow on the magnetospheric dynamics is investigated using global MHD simulations. The global and subsolar local reconnection rates are reduced after the ionosphere plasma enters into the magnetosphere. This effect, however, has outflow origin dependence. The reconnection rate decreases more and reaches its minimum late when the ionosphere plasma upwelling occurs in the dayside cusp region than when it is out of the night side auroral region. The greater reduction in the reconnection rate in the cusp-origin outflow case is not only caused by the arrival of heavy plasma at the magnetopause, but also due to diminishing magnetic fields earthward of the magnetopause, which results from the formation of ring current driven by earthward ejection of plasma from the heavily stretched tail. This depression of magnetic field inside the magnetopause results in earthward motion of the magnetopause. But with a night aurora-origin outflow, no depression of the magnetic field and corresponding magnetopause motion are observed. By enforcing a uniform outflow of O+ over the polar cap, the outflow intensity is found to play an important role in determining the magnetospheric global state. A higher density outflow is responsible for the growth of Kelvin-Helmholtz instability near the dawn and dusk magnetopause. Higher density outflow also contributes more energy and mass source to the ring current and thereby a larger Dst index.
Ridley Aaron J.
Yu Yue
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