Status of the Geomagnetic Network in the Czech Republic

A recent stage of the magnetic surveying activities in the Czech Republic was started in the fifties by setting up a fundamental network of the first order. It consists of 199 points, which have been stabilized by means of granite boundary stones.

Measurements of the vertical and horizontal components were carried out in 1957-58 and supplemented by reduced values of declination obtained at a former campaign. The network was re-occupied in 1976-1978 when three components D (by Matting & Wiesenberg theodolite), H (QHM) and Z (BMZ) were completed by the measurements of the total field F (by PPM). The latter allowed to correct random errors. The azimuth was determined by the Sun observations. The last magnetic survey in 1994-96 was carried out by a fluxgate theodolite and a proton precession magnetometer.

Since 1970 six selected point have been reoccupied approximately every 2 years. Last measurements were carried out in 2001. All measurements are reduced to the epoch yyyy.5 using data from geomagnetic observatory Budkov.

Contact: Pavel Hejda (ph@ig.cas.cz) and Josef Horacek (jhor@ig.cas.cz)
Geophysical Institute, Academy of Sciences, 141 31 Prague, Czech Republic