Magnetometer array observations of a giant pulsation event

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K.-H. Glasmeier


On 19 November 1976 a rather well developed giant pulsation event occurred at about 0600 MLT over northern Scandinavia. Results of observations obtained with a dense network of magnetometer stations are reported. The method of analysis is based on the concept of the analytical signal. The disturbance region was strongly localised. The amplitudes of the horizontal components show a pronounced difference: the amplitude maximum of the N-S component is clearly moving to the west while that of the E-W component is nearly fixed relative to the array. The frequency of the event decreased with time. Both the frequency decrease and the drift of the amplitude maximum are interpreted in terms of bounce - resonance instability. The spatial polarisation pattern found is in agreement with the fieldline-resonance theory in that the sense of rotation of the horizontal disturbance vector is as predicted by the theory. At the region of maximum amplitudes the pulsation is linearly polarised in E-W direction, as observed by other workers. This does not agree with the fieldline-resonance model. Apparent azimuthal wave numbers of the horizontal components show that the event analysed is a westward-travelling wave. The wave numbers are as large as predicted by Olson and Rostoker's (1978) empirically derived relation between the E-W wave number and the frequency of pc 4-5 pulsations.

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Glasmeier, K.-H. (1980). Magnetometer array observations of a giant pulsation event. Journal of Geophysics, 48(1), 127-138. Retrieved from


Annexstad, J.O., Wilson, C.R. (1968) Characteristics of pg micropulsations at conjugate points. J. Geophys. Res. 73:1805-1818

Born, M., Wolff, E. (1975) Principles of optics. 5th edn. Pergamon Press, Oxford

Brice, N.M. (1967) Bulk motion in the magnetosphere. J. Geophys. Res. 72:5193-5211

Chen, L., Hasegawa, A. (1974) A theory of long-period magnetic pulsations, 1. Steady state excitation of fieldline resonance. J. Geophys. Res. 79:1024-1032

Dungey, J.W. (1964) Effects of electromagnetic perturbations on particles trapped in the radiation belts. Space Sci. Rev. 4:199-222

Eleman, F. (1967) Studies of giant pulsations, continuous pulsations and pulsation trains in the geomagnetic field. Ark. Geofys. 5:231-282

Farnbach, J.S. (1975) The complex envelope in seismic signal analysis. Bull. Seismol. Soc. Am. 65:951-962

Fischer, F.A. (1969) Einfuhrung in die statistische Ubertragungstheorie. Bibliographisches Institut, Mannheim-Zurich

Fukushima, N. (1976) Ground magnetic effect of field-aligned currents connected with ionospheric currents. Geophysics Research Laboratory, Univ. Tokio, UT-GRL-76-01

Gabor, D. (1946) Theory of communication. J. Inst. Elec. Eng. 93:429-457

Gough, D.I., Reitzel, J.S. (1967) A portable three-component magnetic variometer. J. Geomagn. Geoelectr. 19:203-215

Green, C.A. (1976) The longitudinal phase variation of midlatitude pc 3-4 micropulsations. Planet. Space Sci. 24:79-85

Green, C.A. (1978) Meridional characteristics of a pc 4 micropulsation event in the plasmasphere. Planet. Space Sci. 26:955-967

Green, C.A. (1979) Observations of pg pulsations in the northern auroral zone and at lower latitude conjugate regions. Planet. Space Sci. 27:63-77

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

Hamlin, D.A., Karplus, R., Vik, R.C., Watson, K.M. (1961) Mirror and azimuthal drift frequencies for geomagnetically trapped particles. J. Geophys. Res. 66:1-4

Harang, L. (1936) Oscillations and vibrations in the magnetic records at high-latitude stations. Terr. Magn. Atmos. Electr. 41:329-336

Heacock, R.R., Henderson, D.J., Reid, J.S., Kivinen, M. (1976) Type IPDP pulsation events in the late evening-midnight sector. J. Geophys. Res. 81:273-280

Hillebrand, O. (1974) Registrierung von Riesenpulsationen in Skandinavien und Analyse der Daten. Diss. Math.-Nat. Fak. Univ. Gottingen

Hillebrand, O. (1976) Spatial characteristics of giant pulsations. J. Geophys. 42:257-269

Hughes, W.J. (1974) The effect of the atmosphere and ionosphere on long-period magnetospheric microspulsations. Planet. Space Sci. 22:1157-1172

Hughes, W.J., McPherron, R.D., Barfield, J.N., Mauk, B.H. (1979) A compressional pc 4 pulsation observed by three satellites in geostationary orbit near local midnight. Planet. Space Sci. 27:821-840

Inoue, Y. (1973) Wave polarisations of geomagnetic pulsations observed in high latitudes on the earth's surface. J. Geophys. Res. 78:2959-2976

Jacobs, J.A. (1970) Geomagnetic micropulsations. Springer, Berlin-Heidelberg-New York

Jacobs, J.A., Sinno, K. (1960) World-wide characteristics of geomagnetic micropulsations. Geophys. J.R. Astron. Soc. 3:333-353

Jacobs, J.A., Watanabe, T. (1966) Amplification of hydromagnetic waves in the magnetosphere by a cyclotron instability process with applications to the theory of hydromagnetic whistlers. J. Atmos. Terr. Phys. 28:235-253

Jones, A.G., Olafsdottir, B. (1979) Geomagnetic induction studies in northern Scandinavia (Abstract). Geophys. J.R. Astron. Soc. 57:265

Kodera, K., Gendrin, R., de Villedary, C. (1977) Complex representation of a polarised signal and its application to the analysis of ULF-waves. J. Geophys. Res. 82:1245-1255

Kuppers, F., Post, H. (1980) A second generation Gough-Reitzel magnetometer. J. Geomagn. Geoelectr. (In press)

Kuppers, F., Untiedt, J., Baumjohann, W., Lange, K., Jones, A.G. (1979) A two-dimensional magnetometer array for groundbased observations of auroral zone electric currents during the International Magnetometer Study (IMS). J. Geophys. 46:429-450

Mier-Jedrzejowicz, W.A.C., Southwood, D.J. (1979) The east-west structure of mid-latitude geomagnetic pulsations in the 8-25 mHz band. Planet. Space Sci. 27:617-630

Obayashi, T., Jacobs, J.A. (1958) Geomagnetic pulsations and the earth's outer atmosphere. Geophys. J.R. Astron. Soc. 1:53-63

Obertz, P., Raspopov, O.M. (1968) Study of the spatial characteristics of type pc 5 geomagnetic pulsations. Geomagn. Aeron. (USSR) 8:424-427

Ol', A.L. (1963) Long periodic gigantic geomagnetic field pulsations. Geomagn. Aeron. (USSR) 3:90-95

Orr, D., Matthew, J.A.D. (1971) The variation of geomagnetic micropulsation periods with latitude and the plasma-pause. Planet. Space Sci. 19:897-905

Olson, J.V., Rostoker, G. (1978) Longitudinal phase variations of pc4-5 pulsations. J. Geophys. Res. 83:2481-2488

Prince, C.E., Bostick, F.X. (1964) Ionospheric transmission of transeversely propagated plane waves at micro-pulsation frequencies and theoretical power spectrums. J. Geophys. Res. 69:3213-3234

Radoski, H.R. (1967) Highly asymmetric MHD resonances: The guided poloidal mode. J. Geophys. Res. 72:4026-4027

Rolf, B. (1931) Giant micropulsations at Abisko. Terr. Magn. Atmos. Electr. 36:9-14

Rostoker, G., Lam, H.-L., Olson, J.V. (1979) Pc 4 giant pulsations in the morning sector. J. Geophys. Res. 84:5153-5166

Samson, J.C., Jacobs, J.A., Rostoker, G. (1971) Latitude-dependent characteristics of high-latitude pc 4 and pc 5 micropulsations. J. Geophys. Res. 76:3675-3683

Schmucker, U. (1978) Auswerteverfahren Goettingen. In: Elektromagnetische Tiefenforschung, Kolloquium Neustadt/Weinstrasse, pp. 163-188. Hrsg. · Haak, V., lnstitut fur Geophysikalische Wissenschaften, Berlin und Homilius, J., Niedersachsisches Landesamt fur Bodenforschung Hannover

Schulz, M., Lanzerotti, L.J. (1974) Particle diffusion in the radiation belts. Springer-Verlag, Berlin-Heidelberg-New York

Southwood, D.J. (1974) Some features of fieldline resonances in the magnetosphere. Planet. Space Sci. 22:483-491

Southwood, D.J. (1976) A general approach to low-frequency mstability in the ring current plasma. J. Geophys. Res. 81:3340-3348

Southwood, D.J. (1977) Localised compressional hydromagnetic waves in the magnetospheric ring current. Planet. Space Sci. 25:549-554

Southwood, D.J., Dungey, J.W., Ethington, R.J. (1969) Bounce resonant interaction between pulsations and trapped particles. Planet. Space Sci. 17:349-361

Walker, A.D.M., Greenwald, R.A., Stuart, W.F., Green, C.A. (1979) Stare auroral radar observations of pc 5 geomagnetic pulsations. J. Geophys. Res. 84:3373-3388

Wilson, C.R. (1966) Conjugate three-dimensional polarisation of highlatitude micropulsations from a hydromagnetic wave-ionospheric current model. J. Geophys. Res. 71:3233-3249