Measurements of motionally induced voltage in the coastal zone of the Throat of the White Sea

• Published in: Earth, planets, and space planets, and space, 2002-01, Vol.54 (5), p.433-441
• Main Authors: Palshin, N. A., Vanyan, L. L., Poray-Koshits, A. M., Matyushenko, V. A., Kaikkonen, P., Tiikkainen, J.
• Format: Article
• Language: English
• Subjects: Antennas; Coastal zone; Ice cover; Induced voltage; LF electric fields; Measuring instruments; Ocean currents; Reference signals; Sea currents; Temporal variability; Tidal circulation; Tidal currents; Wind tides
• ISSN: 1880-5981; 1343-8832; 1880-5981
• DOI: 10.1186/BF03353034

The theoretical relationship between non-local motionally induced voltages (MIV) and tidal currents is validated with observations of natural low-frequency electric field at the coast of the Throat of the White Sea (northwestern Russia). The Throat of the White Sea is a strait of 50-km width and about 500-km length with depths varying from 20 to 50 m connecting semi-closed White Sea basin with the Barents Sea. Strong tidal currents providing a reference signal for calibrating coastal measurements of non-local MIV characterize the Throat. The measurements were carried out simultaneously by means of two horizontal receiving on-land and land-sea antennas. Tidally driven MIV dominates in all time series obtained in the coastal zone of the Throat of the White Sea. Monitoring of non-local MIV within the coastal zone could be used for studies of wind tides, residual tidal circulation and temporal variability of a quasi-stationary current. MIV measurements offer an important advantage over traditional oceanographic methods (currents meters, etc.), because it works also in winter period (about 6 months) when the White Sea is covered by ice. The main disadvantage of this technique is a necessity to calibrate non-local MIV with some other oceanographic direct or remote measurements.