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We report moderate magnetic flux of 450G < Bf < 750G (3sigma) on the nearbyM5.5 flare star Proxima Centauri. A high resolution UVES spectrum was used tomeasure magnetic flux from Zeeman broadening in absorption lines of molecularFeH around 1mu. The magnetic flux we find is relatively weak compared withclassical strong flare stars, but so are Proxima's flaring rates and actualemission levels. We compare what is known about the rotation rate, Rossbynumber, and activity levels in this star to relations between these quantitiesthat have been recently being developed more generally for M dwarfs. Weconclude that the magnetic flux is higher than the best estimates of the Rossbynumber from period measurements. On the other hand, the activity levels onProxima Centauri are at the high end of what could be expected based on themeasured field, but not so high as to exceed the natural scatter in theserelations (other stars lie along this high envelope as well).

The moderate magnetic field on the flare star Proxima Centauri