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'''Geomagnetic secular variation''' refers to changes in the [[Earth's magnetic field]] on ...e]] and [[magnetosphere]], and some changes can be traced to [[geomagnetic storms]] or daily variations in currents. Changes over time scales of a year or m ...

...within the inner magnetosphere drifts orthogonal to that field and to the geomagnetic field '''B'''_o. The generation process is not yet completely und It is based on two simplifying assumptions: first, a coaxial geomagnetic dipole field '''B''' is introduced. Its magnetic field lines ...

{{Short description|Solar storms during solar cycle 20}} | title = Solar storms of August 1972 ...

...five satellites which hope to gather more precise history of how magnetic storms arise and dissipate.<ref>[https://nssdc.gsfc.nasa.gov/nmc/spacecraft/displa ...ission (1959) a '''proton processional magnetometer''' was used to measure geomagnetic fields. The proton source was hexane.<ref>[https://nssdc.gsfc.nasa.gov/nmc/ ...