31. While the North and South paleomagnetists in calculating geomagnetic fields in the past. 32. The geomagnetic field changes on time scales from milliseconds to millions of years. 33. On September 1 2, 1859, the largest recorded geomagnetic storm occurred. 34. During geomagnetic storms, this system can be severely hampered by radio clutter. 35. During geomagnetic storms, the number and energy of electrons and ions increase. 36. The magnetized bar tends to orient the assembly with the local geomagnetic field. 37. Scientific opinion is divided on what causes geomagnetic excursions. 38. K-Ar dating was used to calibrate the geomagnetic polarity time scale. 39. Grid management is also aided by space weather forecasts of major geomagnetic storms. 40. The electrification of the Berlin Stadtbahn disturbed geomagnetic observations in Potsdam and Seddin.
