The 2D structure of long-lasting quasi-radial IMF event in the near-Earth region

The long-lasting radial Interplanetary Magnetic Field (rIMF) event has captured the attention of scientists for over two decades because of its unique effect on the magnetosphere. However, our understanding of the structure of this event in the interplanetary space is still limited. Previous studies denote that the traditional approach of shifting the L1 observation into the nose of the bow shock might not be suitable for the rIMF events due to their special orientation. This paper shows our results based on Wind, ACE, and STEREO observations. We estimate the correlation length of solar wind parameters for rIMF and compare it with the values under a Parker-spiral orientation. Moreover, the results show that the average width of the rIMF events in the Y_GSE direction reaches hundreds of R_E.