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This is an activity about changes in the Earth's magnetic field during magnetic storms. Learners will construct a soda bottle magnetometer, collect data, and analyze the results to detect magnetic storm events. The operation of the student-created instrument can be directly related to THEMIS (Time History of Events and Macroscale Interactions during Substorms) display measurements. In this activity, learners should ideally collect data over the course of an entire month. This is activity 17 in Exploring Magnetism: Earth's Magnetic Personality.