Corotating shocks in inner heliosphere

Two possible corotating shocks in the inner heliosphere where the solar wind is composed of low 8 plasma are reported. In the region where the solar wind is slightly super Alfvenic, reverse corotating fast MHD shocks can form at the leading edge of a high speed stream. These shocks possess a switch on mechanism for amplification of tangential small scale fluctuations. The second one is the coronal slow shocks which may be imbedded in large coronal holes at low altitide in the sub Alfvenic region.