Keywords: June 2014 magnetic field.jpg en ˜Snapshot ™ of the main magnetic field at Earth ™s surface as of June 2014 based on Swarm data The measurements are dominated by the magnetic contribution from Earth ™s core about 95 while the contributions from other sources the mantle crust oceans ionosphere and magnetosphere make up the rest Red represents areas where the magnetic field is stronger while blues show areas where it is weaker 2014-06-03 16 43 10 http //www esa int/spaceinimages/Images/2014/06/June_2014_magnetic_field ESA/DTU Space other versions http //www esa int/ ESA Earth's magnetic field |