Main Article Content
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.
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...)
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