CEDAR email: IAGA session A39 (abstract deadline 12 March)

Astrid Maute maute at ucar.edu
Fri Mar 3 13:35:31 MST 2017

Dear Colleagues,

the IAGA meeting will be in Cape Town, South Africa  from 27 August  to 1
September 2017. The IAGA abstract submission *deadline is on 12 March 2017.*

We want to bring to your attention an across discipline session A39
and Using Realistic External Source Models for imaging global deep Earth
conductivity with Satellite and Ground-based Data”. *Please consider
submitting an abstract. The session description is attached below.

The conveners (Gary Egbert, Astrid Maute, Patrick Alken, Nils Olsen)


A39 - Developing and Using Realistic External Source Models for Imaging
global deep Earth conductivity with Satellite and Ground-based Data (DIV VI

Recent developments in EM induction modeling and inversion, together with
new global geomagnetic datasets (e.g., from the SWARM mission), present
exciting new opportunities for imaging three-dimensional electrical
conductivity variations in the mantle. Results from these studies may
ultimately provide important new constraints on the composition (e.g.,
water content), physical state, and geodynamics of the deep Earth. Probably
the greatest obstacle to success in this endeavor is the need to accurately
characterize the spatially complex external source fields, which must be
disentangled from the induced internal fields to image mantle conductivity
reliably. Observations of the time-varying magnetic fields remain sparse,
making a direct empirical separation very challenging. One promising
approach is to make use of physics-based numerical models of ionospheric
and magnetospheric current systems. These are becoming increasingly
sophisticated, and may provide additional constraints on source geometries,
and enable significant advances in realistic modeling of external sources.
This symposium seeks to bring the induction and external source communities
together, to explore progress on combining ground- and satellite-based
geomagnetic observations with numerical models for improved separation,
characterization and modeling of external source current systems in the
ionosphere and magnetosphere.

Contributions on improving source models for mantle induction studies are
sought, along with novel uses of satellite and ground based data to
validate or improve models for external source studies. We also welcome
contributions on other aspects of global-scale studies of mantle electrical
conductivity, including theoretical or methodological developments, and
results based on analysis of data from ongoing or past satellite magnetic
missions, as well as ground based arrays.
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