Changes in earth’s dipole

@article{Olson2006ChangesIE,
  title={Changes in earth’s dipole},
  author={Peter L. Olson and H. Amit},
  journal={Naturwissenschaften},
  year={2006},
  volume={93},
  pages={519-542}
}
The dipole moment of Earth’s magnetic field has decreased by nearly % MathType!Translator!2!1!AMS LaTeX.tdl!TeX -- AMS-LaTeX!% MathType!MTEF!2!1!+-% feaaeaart1ev0aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaaGyoaiaacw% caaaa!3755!$$9\% $$ over the past 150 years and by about 30% over the… 
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