Direct measurements of the intensity of the Earth's magnetic field began around 1840, and since that time geophysicists had observed a steady decline in the strength of the field.
And while the consequences would be nowhere near as catastrophic as those in the movie, geophysicists increasingly wonder whether the magnetic field has begun one of its occasional reversals that in the next few thousand years might lead to compasses pointing south instead of north.
And computer models hint that vortices in the molten flow that swirl in a direction that weakens the magnetic field might begin the pole-flipping process.
With the launch of the Swarm constellation of satellites (Friis-Christensen et al., 2006), a new era in the study of the Earth's magnetic field will begin.
And, following the Magnetic Fields' lead, the instrument began popping up throughout the indie-rock world: Mirah, Beirut, Dent May, Noah and the Whale, Buke and Gass, Tune-Yards, even a Neutral Milk Hotel tribute band called Neutral Uke Hotel.
The amplitude of the second harmonic of the magnetic field during experiment began to increase and after approximately 60 s (1.2106 loading cycles) the process progressed in an avalanche fashion and after 20 s (4105 cycles) the resonance frequency changes.
Recent simulations have also begun to include magnetic fields, and found that they are amplified to dynamically important levels via the turbulent dynamo during the initial collapse (e.g. Sur et al. 2010; Peters et al. 2012; Turk et al. 2012).
Each run began and ended with an extra 12 s silent trial in order to account for heterogeneity in the magnetic field at the beginning of scanning runs and to provide a full acquisition period for the final stimulus train in a block.
If a magnetic sample is irradiated and then collisionate with such neutrons, the magnetic moments of the neutrons begin to rotate around the magnetic fields they encounter in the sample and the spinning direction changes.
The increase in magnetic field in the beginning of March 31 is likely a shock, but the time resolution was not adequate to mark the shock (from Fan et al. 1960).
