Add to ORKGThis is the fourth and final in a series of teachers guides designed to understand magnetometer data and the Time History of Events and Macroscale Interactions during Substorms (THEMIS) mission science, while meeting the needs of high school teachers teaching astronomy, physics, and physical science. It was developed with the goal that students can work directly with the THEMIS magnetometer data. The guide covers vectors, the x-y-z magnetometer plots, creating a prediction for aurora using the magnetometer data, calculating the total magnetic field strength and observing it over months, and the waves in Earth's magnetic field excited by large magnetic storms. Educational levels: High school, Undergraduate lower division