SDO image of the solar source at time of the event-associated type III radio burst. AIA 171 Å is shown in green and the HMI line-of-sight magnetic field (scaled to ±150 G) in black and red tinted colors. Jet is marked by arrow; a 5° Carrington grid is overlaid. The × symbols mark photospheric footpoints of field lines open to the ecliptic, and the + symbols mark footpoints of field lines open to other latitudes at the source surface (Section 5).