We have been repeatedly surveying areas thousands of km from the coast. I think critical to use magnetic data from laboratories in the continent who also might be influenced by local thunderstorms. One possible way is to attach a magnetometer to an oceanographic anchored buoy.
I can analyze if an anomaly is real by observing its behavior in two paralel lines but that will not account for diurnal variation at the day of each acquisition. Therefore, amplitude and any estimates for depth might be erroneous.
My regards, Oderson/Geol. Survey of Brazil
To evaluate magnetic diurnal variation in marine surveys thousands of kilometers from the nearest magnetometer on the coast, you would need to use a combination of different techniques and approaches. Here are some possible methods:
It's important to note that each of these methods has its limitations and uncertainties, and combining multiple approaches can help to improve the accuracy of magnetic variation measurements. Additionally, regular calibration of the instruments used and careful data processing are critical to ensure the reliability of the results.
Dear Shaheen, thank you very much for your valuable comments. We will possibly combine a magnetometer attached to a buoy and European satellite data from Swar.
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