Mercury, the closest planet to the Sun, has a magnetic field similar to Earth’s, though much weaker. One interesting region in this magnetic field is called the “cusp,” where particles from the solar wind—charged gas from the Sun—can enter Mercury’s magnetic shield and interact with the planet’s environment. In this study, we combine two different techniques to detect when and where Mercury’s cusp forms. One method looks at how the magnetic field changes, and the other examines how particles behave in that region. By comparing and improving these techniques, we aim to better understand how the cusp forms, how large it is, and how it changes depending on the conditions in space around Mercury. The results may also help prepare for future space missions (BepiColombo) and improve our ability to compare Mercury’s magnetic environment with Earth’s.