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This is the final report submitted to NASA for a Probe-class concept study ofthe "Farside Array for Radio Science Investigations of the Dark ages andExoplanets" (FARSIDE), a low radio frequency interferometric array on thefarside of the Moon. The design study focused on the instrument, a deploymentrover, the lander and base station, and delivered an architecture broadlyconsistent with the requirements for a Probe mission. This notionalarchitecture consists of 128 dipole antennas deployed across a 10 km area by arover, and tethered to a base station for central processing, power and datatransmission to the Lunar Gateway, or an alternative relay satellite. FARSIDEwould provide the capability to image the entire sky each minute in 1400channels spanning frequencies from 150 kHz to 40 MHz, extending down two ordersof magnitude below bands accessible to ground-based radio astronomy. The lunarfarside can simultaneously provide isolation from terrestrial radio frequencyinterference, auroral kilometric radiation, and plasma noise from the solarwind. This would enable near-continuous monitoring of the nearest stellarsystems in the search for the radio signatures of coronal mass ejections andenergetic particle events, and would also detect the magnetospheres for thenearest candidate habitable exoplanets. Simultaneously, FARSIDE would be usedto characterize similar activity in our own solar system, from the Sun to theouter planets. Through precision calibration via an orbiting beacon, andexquisite foreground characterization, FARSIDE would also measure the Dark Agesglobal 21-cm signal at redshifts from 50-100. It will also be a pathfinder fora larger 21-cm power spectrum instrument by carefully measuring the foregroundwith high dynamic range.

NASA Probe Study Report: Farside Array for Radio Science Investigations of the Dark ages and Exoplanets (FARSIDE)