Identifying the arrival of complex structures at 1AU using the seesaw space

The seesaw space, is an orthogonal space formed by the local and the global fluctuations of any of the four basic solar wind parameters: velocity, density, magnetic field and temperature. Basically, the method compares two ratios of fluctuations of each SW parameter in different time scales: local (one month) vs global(one year). We created this vectorial space to automatically identify the arrival of solar wind transients to any spacecraft. We have applied the seesaw analysis to the solar wind data of WIND spacecraft from 1992 to 2018. The norm of this space gives important information about the presence of a large disturbances in the solar wind and by applying a wavelet transform to this norm we are able to determine, without subjectivity, the duration of the compression region of these large transient structures. Furthermore, the method can determine if the structure corresponds to a single or complex (i.e. merged) event. In this work, we focus on complex structures and present a detailed analysis of the behavior of the solar wind parameters and their space weather effects for selected cases of study.