The 2009 DRDC/NRL ocean dynamics experiment – Analysis of airborne and undersea magnetic data

  1. Nelson, J.B.
  2. Avera, W.
  3. Liang, R.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
The 2009 ocean dynamics experiment, conducted off the coast of New Jersey, was a collaborative effort between DRDC Atlantic and the Naval Research Laboratory. The purpose of the experiment was to measure both undersea and airborne magnetic fields in the same area where oceanographic measurements such as ocean water flow, temperature, and conductivity were measured. The goal was to determine if ocean-generated magnetic fields predicted from the oceanographic measurements could be correlated with the magnetic measurements. Two magnetometer-equipped aircraft were used to gather the airborne data and proton magnetometers on the seafloor were used to collect the in-water magnetic data. Acoustic Doppler Current Profilers (ADCPs) and conductivity-temperature depth profilers were used to measure the oceanographic quantities. The aeromagnetic data were corrected for magnetic noise from the aircraft, geology, deviations from the intended flight track, and geomagnetic activity. The two aircraft magnetic residuals matched quite closely in both amplitude and phase in many places, but in other places the phase match was poor. This produced an overall poor coherence between the two residuals. However, cross-spectral analysis showed that there was a statistical correlation between the two aircraft residuals in the frequency band 0.02-0.05 Hz (corresponding to 5000-2000 m wavelength for an aircraft flying at 100 m/s). Both the amplitude (0.1-0.2 nT) and wavelength were consistent with the ADC

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Report Number
DRDC-ATLANTIC-TM-2010-198 — Technical Memorandum
Date of publication
01 Dec 2010
Number of Pages
Electronic Document(PDF)

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