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Mid-continent Magnetoseismic Chain (McMaC) is a National Science Foundation (NSF) project that conducts research in magnetospheric sounding using ground magnetic field observations. We refer the methodology used in this research as "magneto-seismology", reflecting its similarity to terrestrial seismology and helioseismology. The magnetoseismic research consists of two parts: the normal mode analysis that deduces the plasma density along a field line from its resonant frequencies, and the travel-time analysis that infers the density distribution in an extended region by timing the arrival of impulsive signals at multiple locations.

To provide necessary data for employing magnetoseismic methods, 9 new magnetometers will be installed in the United States and Mexico. These new magnetometers and part of the existing stations in the CANOPUS and IGPP-LANL arrays will form McMaC, a long north-south chain of 17 magnetometers whose L -values range from 1.3 to 11.7. A database of the mass density of magnetospheric plasma derived from magnetoseismic methods will be established to investigate magnetospheric dynamics under different solar wind and ionospheric conditions.