Practical 27-day plus space weather forecasting

The recent extended solar minimum period has provided an excellent multi-year period of recurrent space weather events. These events originate with solar coronal holes and through their high speed streams (HSS) interactions with the slow solar wind, generate a corotating interaction region (CIR) in the solar wind. The ensuing interactions of the HSS and CIR with the magnetophere create a very significant multi-day geospace weather response. Measurements of both thermospheric and ionosheric parameters show the weather response. In this presentation, the predictability of these events, their magnitude, their duration, and repeatability will be described. In addition, estimates of the energy deposition during such an event will be compared to those of substorms and geomagnetic storms.