Geomagnetic refers to anything related to or associated with Earth's magnetic field. This includes phenomena such as geomagnetic storms, which are disturbances in our planet's magnetosphere caused by solar activity like coronal mass ejections from the sun. These events can have an impact on satellite operations and power grids, among other things. Additionally, geomagnetic refers to the measurement of Earth's magnetic field strength at a particular location using instruments such as magnetometers or proton precession magnetometers.