Effect of Space

Weather observed in the Czech oil pipeline network

Hejda, P. and Pek, J.

Institute of Geophysics of the CAS, Prague, Czech



Although the buried pipelines are provided

with an insulating coating, there are always points where the

insulation is defective and the pipeline is threatened by corrosion.

For this reason, the pipelines are equipped with a cathodic protection

system which keeps the pipeline at a negative potential of about 1 to

2 volts in relation to the ground. The pipe to soil voltage in the

Czech oil pipelines is checked and recorded at about 80 stations. As

the pipelines represent long electric conductors they respond to

electric fields induced by variations of the geomagnetic field.

Variation of the pipe to soil voltage does not represent a real threat

for the pipeline, as it is usually a short time effect. However the

data contain interesting information about geomagnetically induced



Data from autumn 2005 to 2017 were analyzed. The data were cleaned

from variations caused by local sources or by artificial effects. This

was done by comparison with data from neighboring stations. The

variation of the pipe to soil voltages was classified by several

characteristics and compared with planar model of the geoelectric

field computed from geomagnetic variation observed at the Budkov

Observatory. It was also possible to compare several events with data

obtained by magnetotelluric field measurements. It is shown that the

effect of weak magnetic disturbances is negligible as the cathodic

protection can compensate it promptly. On the other hand, the signal

of strong magnetic storms is quite pronounced. The statistics as well

as selected events are presented.


no preference