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An interpretation of induced electric currents in long pipelines caused by natural geomagnetic sources of the upper atmosphere An interpretation of induced electric currents in long pipelines caused by natural geomagnetic sources of the upper atmosphere

Electric currents in long pipelines can contribute to corrosion effects that limit the pipe's lifetime. One cause of such electric currents is the geomagnetic field variations that have sources in the Earth's upper atmosphere. Knowledge of the general behavior of the sources allows a prediction of the occurrence times, favorable locations for the pipeline effects, and long-term...
Authors
W.H. Campbell

Comments on 'Remarks on the secular change in the energy density spectrum of the geomagnetic field' by Joachim Meyer. Comments on 'Remarks on the secular change in the energy density spectrum of the geomagnetic field' by Joachim Meyer.

Meyer has discussed only the Rn aspect of the Alldredge (1984) paper he is criticising. He has ignored the pictorial demonstration of the need for higher harmonics to properly describe the secular variation field than the main field as demonstrated. This more or less independent demonstration supports the general conclusion of that paper.
Authors
L.R. Alldredge
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