Fig. 6
From: NetPICOmag: A low-cost networked magnetometer and its applications
Magnetic northward components from subauroral AUTUMN site RED (Red Deer), NPM sites ATH (Athabasca) and GPR (Grande Prairie), and corresponding auroral zone THEMIS network sites SMI (Fort Smith) and SIM (Fort Simpson). An extremely high degree of coherence is clear, with the auroral zone signals slightly delayed in time compared to the subauroral signals. GPR data is shown with raw counts in order to show that the resolution of NPM, although inferior to that of fluxgates, is suited for studying large-amplitude ULF pulsations. For other sites the scale in nT is identical. The NPM instruments have an intrinsic noise level of order 1 nT, higher than that of the fluxgate instruments at RED, SIM, and SMI.