Abstract
A new geomagnetic limit on the photon mass [ital m][sub [gamma]] is derived from an analysis of satellite measurements of the Earth's magnetic field [ital [rvec H]]. The primary effect of a nonzero photon mass is to generate an additional contribution to [ital [rvec H]] resembling that from an external source. We find [ital m][sub [gamma]][le]8[times]10[sup [minus]16] eV/[ital c][sup 2]=1[times]10[sup [minus]48] g=4[times]10[sup [minus]9] m[sup [minus]1]. The same data are also used to set new limits on long-range fields coexisting with electromagnetism.
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