CMEs and Peculiar Flux Emergence in the Periphery of Huge Monopolar Sunspots

Huge monopolar sunspots with persistent flux emergence are identified to be very CME-prolific. To understand the nature of the flux appearance in the periphery of such huge monopolar sunspots, we scrutinize the long time-sequence of MDI magnetograms taken with high resolution mode for super active regions NOAA AR8375 and 9236, respectively. A peculiar type of flux emergence is discovered. Around each of the huge monopolar sunspots, there appeared several unusual EFRs (emerging flux regions) which emanated out from the parent sunspot, grow and separated along the sunspot periphery. The opposite polarity flux traveled several ten's of kilometers at the speed of approximate 0.3 - 0.5 km/s, in the opposite direction along the path encircling the sunspot. Their total magnetic flux is in the order of 10^20 Mx. These unusual EFRs show the same magnetic orientation, but emerge successively in some preferred locations, and interact one another, forming the multi-fold magnetic neutral lines. It is at these locations that the flare/CMEs initiated in the region. For AR8375, detailed calculation shows that they have the same helicity sign with their parent sunspot. It is tentatively suggested the peculiar flux emergence is the signature of tightly twisted flux ropes encircling the huge monopolar sunspot in the sub-photospheric layers.