Preliminary Results from the Sable Island Geomagnetic Coherence Experiment

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Authors
  1. Nelson, J.B.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
Previous experiments suggested that the geomagnetic field is coherent over distances of hundreds of kilometres at high-altitude over the ocean, but not at low-altitude where most magnetic anomaly detection (MAD) flights are conducted. The reason for this is not understood but computer simulations suggest that excess magnetic noise due to ocean dynamics or variations in the seafloor conductivity along the flight path could cause the effect. Detailed models are required to predict the magnitude of the effect in specific areas. Flights were conducted near Sable Island in August 2005 to gather a data set on which detailed computer simulations can be performed. The flights were conducted in areas where bathymetric and conductivity data exists, the magnetic properties of the seafloor are well known, a basestation could be set up relatively close by, and ocean dynamic processes can be modelled. This report describes the processing steps required to obtain the data set, and the preliminary results which will be compared to NRL Stennis computer simulations of ocean dynamic noise and conductivity anomaly effects.

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Keywords
Magnetic Anomaly Detection;Geomagnetic Field;Geomagnetic Noise Reduction;Aeromagnetic surveys
Report Number
DRDC-ATLANTIC-TM-2006-004 — Technical Memorandum
Date of publication
01 Jan 2006
Number of Pages
76
DSTKIM No
CA027254
CANDIS No
525341
Format(s):
CD ROM

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