HR: 0800h
AN: GP31A-0072    [Abstracts]
TI: Modeling Antarctic magnetic crustal thickness using Oersted, CHAMP and ADMAP data.
AU: * Kim, H
EM: kimhr@core2.gsfc.nasa.gov
AF: GEST/UMBC at Planetary Geodyamics Lab, NASA/GSFC, Greenbelt, MD 20771 United States
AU: von Frese, R R
EM: vonfrese@geology.ohio-state.edu
AF: Dept. of Geol. Sci.,The Ohio State Univ., 255 Mendenhall Lab., Columbus, OH 43210 United States
AU: Golynsky, A V
EM: sasha@viino.nw.ru
AF: VIINOkeangeologia, 1 Anglyisky Ave., St. Petersburg, 190121 Russian Federation
AU: Taylor, P T
EM: Patrick.Taylor@nasa.gov
AF: Planetary Geodynamics Lab, Code 698,NASA/GSFC, Greenbelt, MD 20771 United States
AU: Kim, J
EM: jwkim@sejong.ac.kr
AF: NAS/NRC at Planetary Geodynamics Lab., NASA/GSFC, Greenbelt, MD 20771 United States
AB: We modeled the magnetic crustal thickness of Antarctica and its surrounding oceans using magnetic survey measurements from the surface to airborne and satellite altitudes. We first developed a comprehensive apparent susceptibility model to fit all the magnetic observations. We then inferred their long wavelength crustal thickness effects using spectral correlation filters tuned for the pseudo-magnetic effects of the crustal thickness variations derived from regional gravity observations. With iterative nonlinear least squares inversion, we estimated the magnetic crustal thickness with a priori susceptibilities for the oceans and continent, respectively. The residual short wavelength components representing localized magnetic anomalies in the Antarctic crust were analyzed for additional magnetization constrasts that were added to the regional crustal thickness magetizations. The comprehensive magnetization model estimated from all magnetic survey observations from near-surface to satellite altitudes provides important constraints on the geothermal flux and tectonic evolution of the Antarctic, as well as its glacial dynamics.
DE: 0545 Modeling (4255)
DE: 1541 Satellite magnetics: main field, crustal field, external field
SC: Geomagnetism and Paleomagnetism [GP]
MN: Fall Meeting 2005