The MEASURE Array currently consists of ten individual stations, eight of which were deployed specifically for the MEASURE array.

Two additional stations at Ottawa Canada (operated by the Canadian Geological Survey) and Fredricksburg Va (operated by the United States Geological Survey) are formally part of the array though Fredricksburg currently does not provide 1 sec data.

These 10 stations are arranged in such a way to create 5 pairs of closely spaced magnetometers (see Figure 1) ranging from an L of 1.7 to 3.3 (see Table 1).

The first stations (APL and JAX) came on line during the summer of 1998, with the rest of the stations coming on-line during the summer of 1999.

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