THE MAIN OBJECTIVE OF THIS PROPOSAL IS TO INVESTIGATE THE OCCURRENCE OF ELECTRON-ONLY RECONNECTION IN THE MAGNETOSHEATH AND ESTABLISH THE UNDERLYING PROPERTIES OF THIS PROCESS. WE WILL ADDRESS THE FOLLOWING KEY QUESTIONS: 1. WHAT ARE THE OBSERVABLE SIGNATURES THAT CAN THE OCCURRENCE OF ELECTRON-ONLY RECONNECTION IN THE EARTH S TURBULENT MAGNETOSHEATH? 2. WHAT IS THE RANGE OF RECONNECTION RATE ASSOCIATED WITH ELECTRON-ONLY RECONNECTION? THESE SCIENCE QUESTIONS WILL BE ADDRESSED WITH A COMPREHENSIVE SURVEY OF MAGNETOSHEATH CURRENT SHEETS OBSERVED BY THE MAGNETOSPHERIC MULTISCALE (MMS) MISSION COVERING A WIDE RANGE OF INFLOWING PLASMA PARAMETERS. MMS IS UNIQUELY CAPABLE TO FULLY RESOLVE ELECTRON-SCALE CURRENT SHEETS AND ABLE TO CONVINCINGLY IDENTIFY RECONNECTION EVENTS BECAUSE OF ITS ULTRA-HIGH-RESOLUTION PLASMA AND FIELD MEASUREMENTS. THERE ARE THOUSANDS OF MAGNETOSHEATH CURRENT SHEETS CAPTURED FROM SEPT 2015 TO MARCH 2020 BY MMS WHICH IS SUFFICIENT FOR THE PROPOSED STUDY. WE WILL FOCUS ON LARGE SETS OF INTENSE CURRENT SHEETS TO SEARCH FOR ELECTRON-ONLY RECONNECTION EVENTS. ONCE A SET OF ELECTRON-ONLY EVENTS HAVE BEEN RIGOROUSLY ED WE WILL USE THEM TO UNDERSTAND THE RANGE OF RECONNECTION RATE.