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Do cities have a unique magnetic pulse?

We present a comparative analysis of urban magnetic fields between two American cities: Berkeley (California) and Brooklyn Borough of New York City (New York). Our analysis uses data taken over a four-week period during which magnetic field data were continuously recorded using a fluxgate magnetomet...

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Published in:	Journal of applied physics 2022-05, Vol.131 (20)
Main Authors:	Dumont, V., Bowen, T. A., Roglans, R., Dobler, G., Sharma, M. S., Karpf, A., Bale, S. D., Wickenbrock, A., Zhivun, E., Kornack, T., Wurtele, J. S., Budker, D.
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Language:	English
Subjects:	Cross correlation Data analysis Fluxgate magnetometers Frequency analysis Frequency domain analysis Magnetic fields Magnetic measurement Magnetic signatures Magnetism Magnetoresistivity
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creator	Dumont, V. Bowen, T. A. Roglans, R. Dobler, G. Sharma, M. S. Karpf, A. Bale, S. D. Wickenbrock, A. Zhivun, E. Kornack, T. Wurtele, J. S. Budker, D.
description	We present a comparative analysis of urban magnetic fields between two American cities: Berkeley (California) and Brooklyn Borough of New York City (New York). Our analysis uses data taken over a four-week period during which magnetic field data were continuously recorded using a fluxgate magnetometer with 70 pT/ Hz noise. We identified significant differences in the magnetic signatures. In particular, we noticed that Berkeley reaches a near-zero magnetic field activity at night, whereas magnetic activity in Brooklyn continues during nighttime. We also present auxiliary measurements acquired using magnetoresistive vector magnetometers (VMRs), with the noise of 300 pT/ Hz, and demonstrate how cross correlation, and frequency-domain analysis, combined with data filtering can be used to extract urban-magnetometry signals and study local anthropogenic activities. Finally, we discuss the potential of using magnetometer networks to characterize the global magnetic field of cities and give directions for future development.
doi_str_mv	10.1063/5.0088264
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subjects	Cross correlation Data analysis Fluxgate magnetometers Frequency analysis Frequency domain analysis Magnetic fields Magnetic measurement Magnetic signatures Magnetism Magnetoresistivity
title	Do cities have a unique magnetic pulse?
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