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An update of Owens et al. (2008) shows that the relationship between thecoronal mass ejection (CME) rate and the heliospheric magnetic field strengthpredicts a field floor of less than 4 nT at 1 AU. This implies that the recordlow values measured during this solar minimum do not necessarily contradict theidea that open flux is conserved. The results are consistent with thehypothesis that CMEs add flux to the heliosphere and interchange reconnectionbetween open flux and closed CME loops subtracts flux. An existing modelembracing this hypothesis, however, overestimates flux during the currentminimum, even though the CME rate has been low. The discrepancy calls forreasonable changes in model assumptions.

Impact of coronal mass ejections, interchange reconnection, and disconnection on heliospheric magnetic field strength