LWA1 (“Long Wavelength Array Station 1”) is a compact array radio telescope operating in the 10-88 MHz band, collocated with the EVLA in central New Mexico. LWA1 currently consists of 256 dual-polarization active dipole antennas in a 100 m x 110 m elliptical footprint, plus 5 additional “outrigger” dual-polarization active dipole antennas on 150-500 m baselines. Each dipole is individually digitized and then formed into 4 beams using a delay-and-sum technique. The beams can be pointed independently; thus in some sense LWA1 is actually 4 radio telescopes. It is also possible to record the individual dipole signals. LWA1 science includes pulsars, astrophysical transients, the Sun, Jupiter, the ionosphere, and more. LWA1 is jointly operated by the University of New Mexico and Virginia Tech, with participation from the U.S. Naval Research Lab.

LWA (without the “1”) is a proposed long-baseline aperture synthesis instrument that would consist of many “stations”, each similar to LWA1.  See also UNM’s LWA web site.

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