The Earth's Magnetic Field : Its History, Origin, and Planetary Perspective

angular dispersion anisotropy archaeomagnetic assumed average axis boundary changes component convection core—mantle Curie temperature demagnetization determined dipole field dipole moment direction distribution dynamo theory Earth Planet earth's core earth's magnetic field earth's surface effects electric estimates excursion field lines fluid geographic pole Geomag geomagnetic field Geophys given grains hemisphere hydromagnetic inclination intensity Lake Lake Mungo latitude lava flows Lee and McElhinny lunar magnetic anomalies magnetic induction equation magnetosphere magnitude mantle McElhinny 1984 McFadden and McElhinny measurements Merrill meteorites method non-dipole field normal observed obtained occur origin outer core palaeointensity palaeomagnetic palaeomagnetic data polarity intervals polarity transition poloidal present probably problem record region remanent magnetization reversal rocks rotation sample secular variation sediments solar wind sources spherical harmonic standing field suggested sunspots Thellier time-averaged toroidal toroidal field toroidal magnetic field VDMs vector velocity field waves westward drift Yukutake