Upstream Ultra‐Low Frequency Waves observed by MESSENGER's Magnetometer: Implications for Particle Acceleration at Mercury's Bow Shock

N. R. is an Assistant Research Scientistat NASA Goddard Space Flight Center,and University of Maryland Baltimore County hired through a cooperative agreement with Center for Research and Exploration in Space Sciences and Technology II. Support for this research was provided by NASA’s Planetary Science Division Research Program. D.J.G. and G.A.D. were supported by the NASA ROSES Discovery Data Analysis program under Grant NNX16AJ05G. MESSENGER Magnetometer data used in this study are publicly available through the Planetary Data System (https://pds-ppi.igpp.ucla.edu/index.jsp).