T. S. Horbury, H. L. O’Brien, C. Greenaway, A. Roberts, A. Crabtree, M. (Matěj) Tomeš, M. Facchinelli, M. Finlayson, M. Bharatia, E. Fauchon-Jones, M. Tapley, S. Pope, D. Jones, I. Richter, S. Dalla, C. Russell, N. A. Schwadron, M. Gkioulidou, D. J. McComas
The magnetometer (MAG) is one of the ten scientific instruments on the Interstellar Mapping and Acceleration Probe (IMAP), which will take in situ and remote measurements from a Sun-Earth L1 halo orbit. MAG contributes to IMAP science goals of investigating the acceleration and propagation of energetic particles, as well as providing real-time space weather monitoring data. The magnetometer is a conventional dual sensor fluxgate instrument with a noise floor under 10 pT at 1 Hz, taking science measurements continuously at 2 vectors/s as well as a burst mode of 64 vectors/s for at least 8 hours per day. It also provides a real-time space weather monitoring product at 4 second cadence. We describe the requirements, design and performance of the instrument, including a novel lossless compression algorithm. Data products, processing and calibration plans are presented.