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This is an activity about using spectrogram plots as an indicator of magnetic activity on Earth. Learners will analyze spectrogram data and compare it to local Kp indices in an attempt to determine global magnetic storminess. This activity uses real data from the THEMIS (Time History of Events and Macroscale Interactions during Substorms) Magnetometer, and requires a computer with Internet access. This is activity 20 in the Exploring Magnetism: Earth's Magnetic Personality teachers guide.