P. GEORGESCU, J.-L. LE MOUËL, M. MANDEA
(REZUMAT)
Efectele perturbatoare, generate de caile ferate asupra achizitiei de date
la observatoarele geomagnetice situate în apropierea lor, sunt bine
cunoscute. Conditiile actuale de precizie, impuse de catre programul INTERMAGNET,
subliniaza importanta acestei probleme în prezent. Aceasta lucrare
prezinta o estimare generala a efectelor electrice si magnetice generate
de caile ferate, cu privire speciala asupra intensitatii lor. Sunt calculate,
pentru prima data, perturbatiile câmpului electric în cazul unui
subsol stratificat pe orizontala, subliniind, de asemenea, influenta lungimii
caii ferate asupra amplitudinii acestor perturbatii. Formulele elaborate
sunt puse la dispozitia celor interesati în aceasta problema.
Key words: electric field, magnetic perturbations, D.C. Railway
Electrified railways, especially when fed with D.C. current, have been known for long time to endanger magnetic observatories settled in the vicinity. This is still true nowadays that standards required from data issued from observatories (such as the ones demanded by the INTERMAGNET program) have been upgraded. The paper is devoted to a general assessment of the electric and magnetic effects which can be generated by the railway, with special emphasis on their magnitude. For the first time, it is shown how the perturbations of the electric field can be calculated in the case of a stratified substratum. It is also underline the influence of the railway length to the magnitude of electric and magnetic perturbations. Formulae are given which, we hope, could be of some use to people in charge of observatories.