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By volume, more than 99% of the solar system has not been imaged at radiofrequencies. Almost all of this space (the solar wind) can be traversed by fastelectrons producing radio emissions at frequencies lower than the terrestrialionospheric cutoff, which prevents observation from the ground. To date, radioastronomy-capable space missions consist of one or a few satellites, typicallyfar from each other, which measure total power from the radio sources, butcannot produce images with useful angular resolution. To produce such images,we require arrays of antennas distributed over many wavelengths (hundreds ofmeters to kilometers) to permit aperture synthesis imaging. Such arrays couldbe free-flying arrays of microsatellites or antennas laid out on the lunarsurface. In this white paper, we present the lunar option. If such an arraywere in place by 2020, it would provide context for observations during SolarProbe Plus perihelion passes. Studies of the lunar ionosphere's density andtime variability are also important goals. This white paper applies to theSolar and Heliospheric Physics study panel.

A Radio Observatory on the Lunar Surface for Solar studies (ROLSS)