Greg Lucas Group Update 7/21/2014. TEA-IS Summer School.

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Presentation transcript:

Greg Lucas Group Update 7/21/2014

TEA-IS Summer School

1 week in France Most people were lightning/sprite modelers but interested in the broad impact of GEC I presented on the 3D modeling efforts, including conductivity, sources and numerical solvers

Model Development Conductivity Source Term (Thunderstorms)

Thunderstorms Developing Over the Americas Nov 17UTE-fields at 1.5 km Orography Return Currents Thunderstorms Coupling Together

Summary People interested in global implications of their work, and the broader picture Modeling local E-fields for different sites around globe is of great interest Collaborations on data/modeling of E- fields from different sites around globe

E-field Motivation Carnegie ship sailed in the 1920’s & 1930’s, people have gotten similar qualitative agreement Can we utilize stations around the globe to get a more quantitative understanding of the Carnegie Curve How are the E-field measurements influenced by local disturbances? –A larger database will remove these factors

Parkinson and Torrenson, 1931 Whipple and Scrase, 1936 Potential gradient land thunderstorm area Electric field measured on wooden ship, away from storms, follows global distribution of thunderstorms in UT. Thunderstorms are the global driver of the electric circuit. Carnegie Curve

Instrumentation Questions Realistic, or due to local solar forcing?

Local Variations Kennedy Space Center Field Mill Network

Thunderstorms vs Conductivity Thunderstorms have larger variation over 1 year than conductivity

Ionospheric Potential Mapping Park 1976 Park demonstrated the mapping of ionospheric potentials at polar latitudes for generalized cases. The new numeric models allow us to analyze more realistic potential and conductivity disturbances seen in Ellen’s SuperDARN data

Future 3D Modeling Use FEM code for regional modeling, and mapping solar wind influences to the atmosphere –Ionospheric potential scale sizes –Conductivity disturbances Use RBF model for generating Carnegie curves at locations around the globe Compare seasonal variability and influences of GCR/conductivity variability on global scale Paper outline started, need model!