Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm41a1853f&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM41A-1853
Physics
Plasma Physics
[2753] Magnetospheric Physics / Numerical Modeling, [2764] Magnetospheric Physics / Plasma Sheet, [7845] Space Plasma Physics / Particle Acceleration, [7846] Space Plasma Physics / Plasma Energization
Scientific paper
During a substorm on February 15, 2008 three THEMIS spacecraft located in the near-Earth tail observed a series of earthward moving dipolarization fronts [Zhou et al., 2009]. The fronts were associated with increased fluxes of energetic ion and electron up to 100 keV. In previous work we have used the combination of global magnetohydrodynamic (MHD)simulation, large scale kinetic simulation (LSK)and particle-in-cell kinetic simulations to investigate the changes in the magnetospheric configuration during this substorm and the resulting acceleration of electrons. By using the MHD simulation we were able to show that spacecraft observed two distinct dipolarization fronts. We showed that electrons were accelerated in two regions: one was near to reconnection site and another by betatron acceleration at the dipolarization fronts[Ashour-Abdalla, 2010]. In this talk we extend these results to include a large scale kinetic study of the dynamics of the ions. Gradual enhancement in the 60-300 keV ions were observed both ahead of the dipolarization fronts and at the dipolarization fronts, while sharp decreases in the 6.9-55 keV ions also were observed at both dipolarization fronts. We use global MHD and LSK simulations to study the ions which were contributing to the observed changes in the ion fluxes. We also trace some selected particles to understand the importance of non-adiabatic motion in such observed ion signatures.
Ashour-Abdalla Maha
Deng Xinghua
El-Alaoui Mostafa
Fu Siqi
Richard Robert L.
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