Consequently, we find that the wave occurrence rate increases with Mercury’s heliocentric distance. These conditions are consistent with larger foreshock size and reflection of solar wind protons, their most likely source. Here, we report that 0.05–0.41 Hz quasi-monochromatic waves are mostly present under quasi-radial and relatively low intensity Interplanetary Magnetic Field, based on 17 Mercury years of MESSENGER Magnetometer data. However, an open question remains in regards to understanding favorable conditions for these planetary foreshocks waves. ![]() ![]() Studies of Mercury’s foreshock have analyzed in detail the properties of ultra-low frequency waves.
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