geomagnetic variation

geomagnetic variation

[¦jē·ō·mag¦ned·ik ver·ē′ā·shən]
(geophysics)
Temporal changes in the geomagnetic field, both long-term (secular) and short-term (transient).
References in periodicals archive ?
ERI's intelligent algorithm allows the activity wristband to track the user's route by collecting geomagnetic variation data of his or her movements.
As mentioned before, in that study, the difference between the old and the new data set could be related to variation in the geomagnetic activity (as was true in the present study as well), the old data being associated with greater geomagnetic variation than the new data.
Our data confirm (though not independently, since they are included in Spottiswoode's much larger data set) that the relationship between ESP and geomagnetic variation is much stronger during a roughly two-hour window of local sidereal time surrounding 13.