Abstract
Mirror mode structures occur in the solar wind either as an isolated magnetic field depression or as trains of magnetic holes (or peaks). Some trains have long durations and have been named mirror mode storms [1]. In this work we investigate mirror mode structures at 1 AU using STEREO A and B high resolution data. Magnetic field data were scanned to search for magnetic holes and peaks in a relatively steady ambient solar wind. We found several examples of mirror mode structures present in the ambient solar wind and also associated with SIRs. In order to study mirror mode origin, we present a case study with mirror mode structures present in the leading edge of a SIR during almost 8 hours corresponding to mirror mode storms. We analyze mirror mode shape and duration as well as plasma and magnetic field conditions that occur in the region surrounding mirror mode storms.
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