High latitude coronal mass ejections during the solar maximum 24

We examined high latitude CMEs using a catalog of prominence eruptions (PEs) detected automatically in the SDO/AIA 304 Å Images (https://cdaw.gsfc.nasa.gov/CME_list/autope/). The source locations are listed in the prominence catalog, so we could exclude the low-latitude CMEs but appeared in the high latitude due to the projection effects. There are 115 high latitude PEs (Latitude>= 60 degree), but we could identify 60 CMEs only. The CME association rate is similar to the that of prominence eruptions observed by microwave (Gopalswamy et al. 2003, ApJ, 586, 562). Yashiro et al. (2020, JASTP, 205, 105324) reported that the high-latitude PE speed decreased with decreasing average polar magnetic field strength, but we could not find such a clear relationship in the CME speed. The speed of high latitude CMEs are typically 400 km/s, but the CME speeds were occasionally high (e.g., ~700 km/s) when the prominence became jet-like CMEs. Because of the difference of the CME widths, the CME speed is not enough parameter to describe the CME kinematics. On the other hand, we found that the kinetic energy of the high latitude CMEs decreased with decreasing average magnetic field strength. Weaker field strengths indicate smaller amount of energy available to power the eruptions.