Long Wire Communications

During severe magnetic storms, long-distance telephone and fax communications (by overland and underwater cables) can be disrupted. Outage problems occur as the disturbed rapid variations in geomagnetic field induce undesirable stray currents in the long telephone-wire connections that are the typical part of the full origin-to-reception communication system. At such times, some messages have been reduced to whispers, static, or complete blackout.

FIGURE 2.25 ► During a geomagnetic storm the upper atmospheric currents at high latitudes induce unwanted disturbance currents in electric power transmission lines, telephone lines, and long oil, gas, and water pipelines.

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