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Instrumentation

North America is the only contiguous continent that spans from low to high magnetic latitudes, and its mid-longitude region covers the widest latitudinal range. There are CANOPUS and IGPP-LANL magnetometers located along this longitude, but the gap between them need to be filled by new stations in order to make the full use of the normal-mode method, which requires short separation (roughly 100-300 km) between two adjacent stations.

The McMaC project will build 9 new magnetometer stations in the United States and Mexico roughly along 330 magnetic longitude. These new systems and the existing CANOPUS and IGPP-LANL stations at the same longitude will cover L-values from 1.3 to 11.7, forming an unprecedentedly long north-south magnetometer chain.

McMaC consists of 6 CARISMA stations, 2 IGPP-LANL stations, and 9 new stations.  Their locations are shown in the map below:

Station Geographic Latitude Geographic Longitude L
Rankin Inlet 62.82 267.89 11.67
Eskimo Point 61.11 265.95 9.70
Fort Churchill 58.76 265.92 7.83
Gillam 56.38 265.36 6.42
Island Lake 53.86 265.34 5.33
Pinawa 50.20 266.75 4.15
Glyndon 46.87 263.55 3.42
Cambridge 45.56 266.75 3.18
Worthington 43.6 264.4 2.86
Bennington 41.36 263.84 2.58
Americus 38.5 263.7 2.28
Purcell 35.0 262.6 1.99
Richardson 32.98 263.25 1.87
San Antonio 29.44 261.39 1.66
Lyford 26.4 262.2 1.53
Linares 24.8 260.4 1.46
Juriquilla 20.70 256.90 1.33

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