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We report on the photospheric evolution of an intermediate-scale (~4 Mmfootpoint separation) magnetic bipole, from emergence to decay, observed in thequiet Sun at high spatial 0".3 and temporal (33 s) resolution. The observationswere acquired by the IMaX imaging magnetograph during the first science flightof the Sunrise balloon-borne solar observatory. The bipole flux content is 6 x10^17 Mx, representing a structure bridging the gap between granular scalebipoles and the smaller ephemeral regions. Footpoints separate at a speed of3.5 km s-1 and reach a maximum distance of 4.5 Mm before the field dissolves.The evolution of the bipole is revealed to be very dynamic: we found a propermotion of the bipole axis and detected a change of the azimuth angle of90{\deg} in 300 seconds. The overall morphology and behaviour are in agreementwith previous analyses of bipolar structures emerging at granular scale, but wealso found several similarities with emerging flux structures at larger scale.The flux growth rate is 2.6 x 15 Mx s-1, while the mean decay rate is one orderof magnitude smaller. We describe in some detail the decay phase of the bipolefootpoints which includes break up into smaller structures, interaction withpre-existing fields leading to cancellation but appears to be dominated by anas-yet unidentified diffusive process that removes most of the flux with anexponential flux decay curve. The diffusion constant (8 x 10^2 km^2 s-1)associated with this decay is similar to the values used to describe the largescale diffusion in flux transport models.

astrophysical journal/the astrophysical journal

The frontier between Small-scale bipoles and Ephemeral Regions in the  solar photosphere: Emergence and Decay of an Intermediate-scale bipole  observed with IMaX/SUNRISE