Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm33b..05j&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM33B-05
Physics
[2744] Magnetospheric Physics / Magnetotail, [2760] Magnetospheric Physics / Plasma Convection, [2764] Magnetospheric Physics / Plasma Sheet, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions
Scientific paper
The global response of Earth's mid-tail region to solar-wind energy input is reasonably well understood, to no small degree thanks to many successful simulations of tail physics. The connection between data and simulations is, however, still somewhat tenuous. Compared to the inner magnetosphere, the tail region suffers from a combination of much larger physical volume and significantly less data coverage in both spatial coverage density and overall amount of data. Tail seasons of the IBEX mission offer a valuable opportunity to improve this situation. By design, IBEX measures energetic neutral atoms (ENA) in cross-sectional cuts in the YZ-plane through the tail. We are tracking these energy-dependent ENA fluxes as a function of time and solar wind energy input. These ENA fluxes can be understood as proxy of the total ion content of the tail in the regions viewed. By tracking the total ion density and the particle energy spectrum as a function of time we observe the global tail response to the variable energy input from the Sun. In this presentation, we are presenting a case study of ENA observations several days in length, comparing the ENA observations with CCMC simulations of the same time periods. Due to the uncertainties of geocorona density and tail geometry (twisting), these data-to-model comparisons are presently primarily qualitative in nature. However, they clearly document the total plasma density roughly varying (as expected) as a function of energy input.
Dayeh M. A.
Elliott Heather Alison
Jahn J.-
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