Multi-method observations and modelling of the three-dimensional currents associated with a very strong Ps6 event

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G. Gustafsson
W. Baumjohann
I. Iversen


A pulsation event has been studied which showed Ps6-type characteristics with a period of about 20 min. Data from a number of magnetometer and riometer measurements over a large area have been combined with balloon measurements of the electric field to obtain a detailed description of the ionospheric current system during the event. The pulsations reported here occured over an interval longer than 3 h and showed large magnetic variations, up to 700 nT.  A model of the three-dimensional current flow has been derived which agrees with the data. It is concluded that most of the magnetic disturbance measured on the ground is caused by Hall-currents.

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Gustafsson, G., Baumjohann, W., & Iversen, I. (1981). Multi-method observations and modelling of the three-dimensional currents associated with a very strong Ps6 event. Journal of Geophysics, 49(1), 138-145. Retrieved from


Akasofu, S-I. (1974) A study of auroral displays photographed from the DMSP-2 satellite and from the Alaska meridian chain of stations. Space Sci. Rev. 16:617-725

Bostrom, R. (1964) A model of the auroral electrojets. J. Geophys. Res. 69:4983-5000

Bostrom, R. (1977) Current systems in the ionosphere and magnetosphere. In: Brekkem, A. (Ed.) Radar probing of the auroral plasma, pp 257-284. Universitetsforlaget, Oslo

Baumjohann, W., Gustafsson, G., Kuppers, F. (1977) Large-amplitude rapid magnetic variations during a substorm (abstract only). EOS Trans. Am. Geophys. Union 58:718

Baumjohann, W. (1979) Spatially inhomogeneous current configurations as seen by the Scandinavian Magnetometer Array. In Proceeding of the International Workshop on Selected Topics of Magnetospheric
Physics. Japanese IMS Committee (Ed.) pp 35-40, Tokyo

Baumjohann, W., Kamide, Y. (1981) Joint two-dimensional observations of ground magnetic and ionospheric electric fields associated with auroral zone currents - 2. Three-dimensional current flow in the morning sector during substorm recovery. J. Geomagn. Geoclectr. (In press)

Fukushima, N. (1974) Equivalent current pattern for ground geomagnetic effect when the ionospheric conductivity is discontinuous at the foot of a field-aligned current sheet. Rep. Janos. Space Res. Jpn. 28:147-151

Fukushima, N. (1976) Generalized theorem for no ground magnetic effect of vertical currents connected with Pedersen currents in the uniformconductivity ionosphere. Rep. Ionos. Space Res. Jpn. 30:35-40

Gustafsson, G. (1970) A revised corrected geomagnetic coordinate system. Ark. Geofys. 5. 595-617

Horwitz, J.L., Doupnik, J.R., Banks, P.M. (1978a) Chatanika radar observations of the latitudinal distributions of amoral zone electric fields, conductivities, and currents. J. Gcophys. Res. 83:1463-1481

Horwitz, J.L., Doupnik, J.R., Banks, P.M. Kamide. Y., Akasofu, S-I. (1978b) The latitudinal distributions of auroral zone electric fields and ground magnetic perturbations and their response to variations in the interplanetary magnetic field. J. Geophys. Res. 83:2071-2084

Iijima, T., Potemra, T.A. (1976) The amplitude distribution of field-aligned currents at northern high latitudes observed by Triad. J. Geophys. Res. 81:2165-2174

Iijima, T., Potemra, T.A. (1978) Large-scale characteristics of field-aligned currents associated with substorms. J. Geophys. Res. 83:599-615

Iversen. I.B., Madsen, M.M., Ullaland, S., Bronstad, K., Bjordal, J. (1977) Electric field and X-ray measurements with balloons during a magnetic storm. Presented at IAGA Assembly

Kamide, Y., Brekke, A. (1977) Altitude of the eastward and westward auroral electrojets. J. Geophys. Res. 82:2851-2853

Kamide, Y., Rostoker, G. (1977) The spatial relationship of field-aligned currents and auroral electrojets to the distribution of nightside auroras. J. Geophys. Res. 82:5589-5608

Kawasaki, K., Rostoker, G. (1979) Perturbation magnetic fields and current systems associated with eastward drifting auroral structures. J. Geophys. Res. 84:1464-1480

Kiselev, B.V., Raspopov, O.M. (1976) Excitation of Pi3 type pulsations during substorm. In. Proceedings of IAGA meeting on unmanned observatories in Antarctica, T Nagata. ed. pp 88-96, Tokyo

Klumpar, D.M. (1979) Relationship between auroral particle distributions and magnetic field perturbations associated with field-aligned currents. J. Geophys. Res. 84:6524-6532

Klumpar, D.M., Burrows, J.R., Wilson, M.D. (1976) Simultaneous observations of field-aligned currents and particle fluxes in the post-midnight sector. Geophys. Res. Lett. 3:395-398

Kuppers, F., Untiedt, J., Baumjohann, W., Lange, K., Jones, A.G. (1979) A two-dimensional magnetometer array for ground-based observations of auroral zone electric currents during the International Magnetospheric Study (IMS). J. Geophys. 46:423-450

Mareschal, M. (1976) On the problem of simulating the earth's induction effects in modelling polar magnetic substorms. Rev. Geophys. Space Phys. 14:403-409

Raspopov, O.M. (1970) Sur la diagnostique des changes electriques dans la magnetosphere de la terre. Ann. Geophys. 26:75l-759

Saito, T. (1972) Some topics for the study of the mechanism of magnetospheric substorm by means of rocket observation in the auroral zone. Antarctic Record 43:65-69

Saito, T. (1974) Examination of the models for the substorm-associated magnetic pulsation Ps6. Sci. Rep. Tohuku Univ. Ser. 5 Geophys. 22:35-59

Saito, T. (1978) Long-period irregular magnetic pulsation. Pi3. Space Sci. Rev. 21:427-467

Saito, T., Yumoto, K. (1978) Comparison of the two-snake model with the observed polarization of the substorm associated magnetic pulsation Ps6. J. Geomagn. Geoelectr. 30:39-45

Snyder, A.L., Akasofu, S-I. (1974) Major auroral substorm features in the dark sector observed by a USAF DMSP satellite. Planet. Space Sci. 22:1511-1517

Sulzbacher, H., Baumjohann, W., Potemra, T.A. (1980) Coordinated magnetic observations of morning sector auroral zone currents with Triad and the Scandinavian Magnetometer Array· a case study. J. Geophys. 48:7-17

Tsunoda, R.T., Fremouw, E.J. (1976) Radar auroral substorm signatures. 2. East-west motions. J. Geo phys. Res. 81:6159-6168

Wescott, E.M., Stenbaek-Nielsen, H.C., Hallinan, T.J., Davis, T.N., Peek, H.M. (1976) The Skylab Barium plasma injection experiments. 2. Evidence for a double layer. J. Gcophys. Res. 81:4495-4502

Zaitsev, A.N., Bostrom, R. (1971) On methods of graphical displaying of polar magnetic disturbances. Planet. Space Sci. 19:643-649