This system measures auroral radio emissions with a radio frequency interferometer. It consists of 17 antennas spaced over 50 acres about 1.5 km north of the site's main building, and is described in J. Hughes et al, Rev. Sci. Instr., Vol. 71, p. 3200, August 2000. Below, low-frequency hiss and correlated MF auroral burst observed during a substorm expansion event.		Jim LaBelle Dartmouth College Phone (603) 646-2973 jlabelle@einstein.dartmouth.edu