Main Article Content
In 1981 and 1982 four arrays of 30 or 31 magnetometers were operated on the Baltic Shield in central and south-eastern Finland to measure the natural magnetic field variations. These measurements were used to deduce some information about the lateral variation of the electrical conductivity within the Earth's crust. The stations were situated between latitudes 56° and 64° geomagnetic north. As substorms often extend over this area, most magnetic disturbance events have strong external spatial gradients and are not suitable for determining the electrical conductivity distribution inside the Earth. Some magnetic disturbance events with only smooth external spatial gradients could be selected and used for further analysis. For 11 of these events (2–6 h long), the horizontal spatial wavenumber k has been calculated. The product of the wavenumber k and the inductive scale length C was then used as an acceptance criterion and as a weighting function in the calculation of single station transfer functions. Most of the data were not acceptable for the criterion k · |C| < 0.3 for periods longer than 500 s. Because of the small number of acceptable data the statistical significance was not sufficient for all sites. Despite these problems induction vectors and conducted hypothetical vertical field maps could be used to locate conductivity anomalies. Intensive induction was found in three zones in the area under investigation.
Authors who publish with this journal as of Vol. 63 agree to the following terms:
a. Authors share the copyright with this journal in equal parts (50% to the journal, 50% to the lead author), and grant the journal right of first publication, with the work after publication simultaneously licensed under Creative Commons Attribution License CC BY-NC-ND 4.0 that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this journal.
b. Authors may enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal, and a reference to this copyright notice.
c. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) during the submission process, as this can lead to productive exchanges and earlier and greater citation of published work and better sales of the copyright.
Authors retain copyright and grant the Journal of Geophysics right of first publication, with the work three years after publication simultaneously licensed under the Creative Commons BY-NC-ND 4.0 License that allows others to share the work (with an acknowledgment of the work's authorship and initial publication in this journal), except for commercial purposes and for creating derivatives.
Authors can enter into separate, additional, but non-commercial contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository, but not publish it in a book), with an acknowledgment of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) before and during the submission process, as that can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
This journal is one of a handful of scholarly journals that publish original scientific works under CC BY-NC-ND 4.0 - the only Creative Commons license affording the authors' intellectual property absolute worldwide protection.
Journal of Geophysics is published under the scholar-publishers model, meaning authors do not surrender their copyright to us. Instead, and unlike corporate publishers like Elsevier or Springer Nature that resell copyright to third-parties for up to $80,000 (per paper, per transaction!), the Journal of Geophysics authors share copyright equally with this journal.
Therefore, all the proceeds from reselling copyright to third parties get shared to equal parts (50% to the journal, 50% to the lead author). Under the Berne Convention, this protection is an inheritable right that lasts for as long as the rightsholder lives + 50 years.
By submitting to this journal, the lead author, on behalf of all co-authors, grants permission to this journal to represent all co-authors in negotiating copyright sales and collecting proceeds. The lead author should negotiate with his/her co-authors the modalities of distributing the lead author's portion of the proceeds. Usually, this is per pre-agreed percentage of each co-author's contribution to creating the copyrighted work. (more...)
Beamish, D. (1979) Source field effects of transfer functions at midlatitudes. Geophys. J. R. Astron. Soc. 58:117-134
Jones, A.G. (1977) Geomagnetic induction studies in southern Scotland. Ph.D. thesis, Dept. of Geophysics, Edinburgh, Univ. Edinburgh, Scotland
Jones, A.G. (1980) Geomagnetic induction studies in Scandinavia - I Determination of the inductive response function from the magnetometer array data. J. Geophys. 48:181-194
Jones, A.G. (1981) Geomagnetic induction studies in Svandinavia - II Geomagnetic depth sounding, induction vectors and coast effects. J. Geophys. 50:23-36
Jones, A.G., Olafsdottir, B., Tiikkainen, J. (1983) Geomagnetic induction studies in Scandinavia - Ill Magnetotelluric observations. J. Geophys. 54:35-50
Kuppers, F., Post, H. (1981) A second generation Gough-Reitzel magnetometer. J. Geomagn. Geoelectr. 33:225-237
Mersmann, U., Baumjohann, W., Kuppers, F., Lange, K. (1979) Analysis of an eastward electrojet by means of upward continuation of ground-based magnetometer data. J. Geophys. 45:281-298
Pajunpaa, K., Heikka, J., Korja, T. (1983) Magnetometer array studies in Finland. J. Geomagn. Geoelectr. (In press)
Porath, H., Oldenburg, D.W., Gough, D.I. (1970) Separation of magnetic variation fields and conductive structures in the western United States. Geophys. J.R. Astron. Soc. 19:237-260
Rokityansky, I.I., Yasin, N.D., Golod, M.I., Novicky, G.P., Rokityanskaya, D.A., Sokolov, S.Ya. (1979) Electric conductivity anomalies in S-Karelia. Geofz. Akad. Nauk USSR, 89:36-39 (In Russian)
Schmucker, U. (1970) Anomalies of geomagnetic variations in the south-western United States. Bull. Scripps Inst. Oceanogr., La Jolla, Calif. 13, 165 pp.
Schmucker, U. (1973) Regional induction studies: a review of methods and results. Phys. Earth Planet. Inter. 7:365-378
Woods, D.V., Lilley, F.E.M. (1979) Geomagnetic induction in central Australia. J. Geomagn. Geoelectr. 31:449-458
Zhang, P., Rasmussen, T., Korja, T., Koivukoski, K. (1983) Preliminary results from a MT study of a conductive zone in Finland. Paper presented at the symposium on the geoelectric model of the Baltic Shield, Oulu, Nov. 15-18