Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm22a..05s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM22A-05
Physics
[2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions
Scientific paper
Empirically derived ion outflow scaling laws can be either index driven, or based on local energy inputs to the topside ionosphere. The former include scaling laws that are derived as a function of Kp, AE, or DST. To some extent, scaling laws that use solar wind and IMF parameters can be thought of in the same way, although they are more closely related to the actual drivers of outflows. The scaling laws using local energy inputs most closely relate the outflow to the dynamically changing inputs. These various types of scaling law allow for better specification of the outflow, and this in turn leads to better predictions from global codes, be they magnetohydrodynamic, or particle trajectory codes. But there are limitations. None of the empirical scaling laws to date have been derived based on the detailed physics of the outflow process. Even the laws based on energy input tend to treat the input in a monolithic manner, using either the Poynting vector or precipitating electron energy and number fluxes to specify the outflow flux. Such an approach does not necessarily elucidate the physical processes involved in outflows. Results from models such as the Dynamic Fluid Kinetic (DyFK) model provide guidance on how better to characterize the outflows using parameters that are more closely related to the underlying physics. Scaling laws need to also take into account parameters such as the condition of the underlying ionosphere (e.g., solar illumination effects). In this presentation we will report on our progress in expanding previously derived empirical scaling laws to better capture and emulate the underlying physics
Lopez Robert E.
Strangeway Robert J.
Zeng Weifei
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