The MEASURE longitudinal magnetometer array is the first permanent magnetometer chain developed to routinely measure the field line resonance (FLR) frequency at low to mid-latitudes. This is accomplished by using the maximum phase difference technique that utilizes closely (150 to 300 km) spaced pairs of magnetometers separated in the north-south magnetic direction.

The five pairs of stations extend from central Florida (L = 1.7) to southern Ontario Canada(L=3.2). The fluxgate magnetometers use GPS receivers to sample the Earth's field at 1 Hz exactly on the second in order to measure small phase differences between stations. The stations are being utilized to study ULF wave propagation, substorms, sudden impulses, and the mass density of the inner magnetosphere.

The mass density of the inner magnetosphere is remotely determined by using the measured FLR frequency and models of the Earth's field. The array is 180o from the 210o Magnetic Meridian chain within the Circum-pan Pacific Magnetometer Network (CPMN), at the same meridian as the Magnetometer Array for Cusp and Cleft Studies (MACCS), and conjugate to the new South American Meridional B-Array (SAMBA) in South America and Antarctica.

This material is based upon work supported by the National Science Foundation under Grant No.0196223. "Any opinions, findings and conclusions or recomendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation (NSF)."

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