Physics – Optics
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16.1145m&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 16, Oct. 1989, p. 1145-1148.
Physics
Optics
19
Communication Cables, Geopotential, Magnetic Storms, Magnetospheric Instability, Transoceanic Communication, Atlantic Ocean, Fiber Optics
Scientific paper
Measurements of the cable power supply voltage at the North American end of the fiber-optic transatlantic telecommunications cable TAT-8 during the March 1989 magnetic storm have provided a measure of the large-scale changes in the total earth potential across the Atlantic during the storm interval. East-west potential changes as large as 700 V (0.12 V/km) peak-to-peak were observed, with many smaller-amplitude variations also seen. The largest variations in earth potential occurred during an extended interval of a very intense eastward electrojet (as measured by a magnetometer at the North American terminus of the cable). The eastward electrojet current probably exceeded 1 MA. The design of the TAT-8 cable power-feed equipment is sufficiently conservative that even such unusually large earth potentials were not a threat to the integrity of the communications system.
Kraus J. S.
Lanzerotti Louis J.
Maclennan Carol G.
Medford L. V.
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