Earth  ID: 12450

Ocean Tides and Magnetic Fields

Earth’s magnetic field is built up from many contributing sources ranging from the planet’s core to the magnetosphere in space. Untangling and identifying the different sources allows geomagnetic scientists to gather information about the individual processes that combine to create the full field.

One contributor is the ocean, although it is a small contributor. From that isolated contribution, scientists at NASA Goddard Space Flight Center have developed a way to determine the heat content of the ocean. But how do the tides affect Earth’s magnetic field?

Seawater is an electrical conductor, and therefore interacts with the magnetic field. As the tides cycle around the ocean basins, the ocean water essentially tries to pull the geomagnetic field lines along.

Because the salty water is a good, but not great, conductor, the interaction is relatively weak. The strongest component is from the regular lunar tide that happens about twice per day (actually 12.42 hours). Other contributions come from ocean swell, eddies, and even tsunamis.

The strength of the interaction depends on the temperature of the ocean water, and scientists are now able to determine how much heat is being stored in the entire ocean, from wave top to sea floor.

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Matthew R. Radcliff (USRA): Lead Producer
Aaron E. Lepsch (ADNET Systems, Inc.): Technical Support
Brian Monroe (USRA): Lead Animator
Matthew R. Radcliff (USRA): Writer
Kate Ramsayer (Telophase Corp.): Writer
Robert H. Tyler (University of Maryland College Park): Scientist
Terence J. Sabaka (NASA/GSFC): Scientist
Michael Lentz (USRA): Artistic Director
Mike Velle (KBRwyle): Narrator
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DLESE >> Geology
DLESE >> Geophysics
SVS >> Magnetic Fields
DLESE >> Physical oceanography
GCMD >> Earth Science >> Oceans >> Ocean Heat Budget
GCMD >> Earth Science >> Oceans >> Tides
GCMD >> Earth Science >> Oceans >> Ocean Heat Budget >> Heat Flux
GCMD >> Earth Science >> Oceans >> Tides >> Tidal Components
GCMD >> Earth Science >> Solid Earth >> Geomagnetism >> Magnetic Field
NASA Science >> Earth

GCMD keywords can be found on the Internet with the following citation: Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version