Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009geoji.177..367j&link_type=abstract
Geophysical Journal International, Volume 177, Issue 2, pp. 367-382.
Astronomy and Astrophysics
Astronomy
4
Electromagnetic Theory, Dynamo: Theories And Simulations, Heat Flow
Scientific paper
We present calculations to place formal lower bounds on the energy dissipated by the magnetic field in the core. These bounds are discovered by solving for 3-D magnetic fields in the Earth's core that are optimally configured for minimizing the dissipation. Such bounds are relevant for addressing the balance of heat flow through the core-mantle boundary into the mantle, and thus for constraining Earth's history scenarios. The bounds we derive are based on a number of different constraints. We use observed values of the magnetic field at the core-mantle boundary for epoch 2001, and also the root-mean-square values of the radial magnetic field on the inner core boundary and the core mantle boundary inferred from interpretations of the Earth's nutations. A formal lower bound for the dissipation based on all the constraints is almost 10 GW. This lower bound is achieved for a 3-D magnetic field configuration that has very unlikely features. We present two further geophysically reasonable (but no longer rigorous) calculations that raise the dissipation towards 100GW, not dissimilar to other recent estimates of dissipation.
Jackson Andrew
Livermore Philip
No associations
LandOfFree
On Ohmic heating in the Earth's core I: nutation constraints does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On Ohmic heating in the Earth's core I: nutation constraints, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On Ohmic heating in the Earth's core I: nutation constraints will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-809769