On the characterization of tidal ocean-dynamo signals in coastal magnetic observatories

HIGHLIGHTS

SUMMARY

    Three factors determine the signal strength of tidal ocean-dynamo signals (TODS): the electrical seawater conductivity σ, the tidal current velocities v, and the Earth`s magnetic_field strength BEarth (mainly the radial component). In the open ocean, changes in the amphidromic system and magnetic_field are slow compared to changes in the conductivity distribution which is determined by seawater salinity and temperature. TODS are several orders of magnitude smaller than other magnetic_field contributions such as the core magnetic_field of the order of 104 nT and occur at the same frequency range as ionospheric signals. The radial . . .

     

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