Analyzing and correcting for contaminating magnetic fields at the Brorfelde geomagnetic observatory due to high voltage DC power lines

作者：Maule Cathrine Fox^*; Thejll Peter; Neska Anne; Matzka Juergen; Pedersen Lars William; Nilsson Anna

来源：Earth Planets and Space, 2009, 61(11): 1233-1241.

DOI：10.1186/bf03352976

• Geomagnetism
• magnetic observatory
• power lines
• K-index

The magnetic field observations made at the geomagnetic observatory Brorfelde (BFE), Denmark, are subject to disturbances of several nT caused by two single wire high-voltage DC power lilies connecting Scandinavia with Central Europe. We have analysed how the magnetic disturbances relate to the Currents in the power lilies and found a linear relationship. Using linear regression oil carefully selected parts of the available data series we have determined the factors of proportionality. Based oil the simple relationship between the Currents in the power lilies and the observed magnetic disturbances, we have derived a method to correct the observatory data for a significant part of the disturbances. In addition we have investigated the influence of the disturbances oil the determination of the K-index of the observatory. We found that the K-index based oil the original disturbed data compared to the K-indices Calculated from corrected data was different in 4% of the 3-hour intervals for the investigated period.

• 出版日期2009