Mathematics – Probability
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsm33a..04y&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SM33A-04
Mathematics
Probability
2736 Magnetosphere/Ionosphere Interactions (2431)
Scientific paper
We study the influence of the IMF and convection electric field on the rate and destination of thermal (low-energy) ion outflows, and its resulting effects on magnetosphere-ionosphere coupling, using single-particle trajectory simulations and ion velocity distribution measurements on Akebono in conjunction with IMF and ionospheric convection data. We find that the ions preferentially feed the dusk sector of the plasma sheet when the IMF is duskward (By > 0), and are more evenly distributed in the plasma sheet when the IMF is dawnward. The flow of oxygen ions originating from the noon or dusk sectors of the polar cap has a higher probability of reaching the magnetosphere and beyond compared with that from the dawn or midnight sectors, due to the increased centrifugal acceleration associated with the larger magnetic field curvature near noon and the increased convection electric field in the dusk sector. The flow is enhanced and confined to lower L-shells at times of strongly southward IMF, compared with that at times of northward IMF. The outflow rate to both the plasma sheet and the magnetotail correlates strongly with the ion temperature. As a result, the IMF and the convection electric fields affect both the overall magnitude and the detailed distribution of mass transfer from the ionosphere to the magnetosphere in magnetosphere-ionosphere coupling.
Howarth Andrew
Yau Andrew W.
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