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Coronal Mass Ejections continuously drag closed magnetic field lines awayfrom the Sun, adding new flux to the interplanetary magnetic field (IMF). Wepropose that the outward-moving blobs that have been observed in helmetstreamers are evidence of ongoing, small-scale reconnection in streamer currentsheets, which may play an important role in the prevention of an indefinitebuildup of the IMF. Reconnection between two open field lines from both sidesof a streamer current sheet creates a new closed field line, which becomes partof the helmet, and a disconnected field line, which moves outward. The blobsare formed by plasma from the streamer that is swept up in the trough of theoutward moving field line. We show that this mechanism is supported byobservations from SOHO/LASCO. Additionally, we propose a thorough statisticalstudy to quantify the contribution of blob formation to the reduction of theIMF, and indicate how this mechanism may be verified by observations withSOHO/UVCS and the proposed NASA STEREO and ESA Polar Orbiter missions.Comment: 7 pages, 2 figures; accepted by The Astrophysical Journal Letters;  uses AASTe

Can Streamer Blobs Prevent the Buildup of the Interplanetary Magnetic Field?