Cusp/polar cap dynamics challenge science and communications/GNSS (Invited)

Details Cusp/polar cap dynamics challenge science and communications/GNSS (Invited) Cusp/polar cap dynamics challenge science and communications/GNSS (Invited)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm14a..01c&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM14A-01

Physics

[2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2447] Ionosphere / Modeling And Forecasting, [2475] Ionosphere / Polar Cap Ionosphere, [2706] Magnetospheric Physics / Cusp

Scientific paper

The character of the polar ionosphere is determined by the solar wind history, as is performance capabilities of high latitude GNSS and communications systems. For system design we have learned key climatology of structuring of the polar cap ionosphere (cause) and of system performance (effect). For operations however, currently each significant new discovery both: defines better solutions, and rearranges priorities on scientific challenges to overcoming obstacles to system reliability. In 2007 we discovered that onset of structuring in polar cap patches (which dominate polar disruptions of GNSS/communications systems) was not by the mechanism accepted for over two decades (gradient drift), but a cusp mechanism (shear driven) creating outage regions far faster (~ minute) and closer (>500 km) to population centers than suspected. Discoveries since, including new cusp shear mechanisms, underscore cusp/polar cap dynamics challenges including self-consistent electrodynamics among: convection models, summation of reconnection and transient flow events, and current-sheet boundary-interfaces.

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