World Library  

Add to Book Shelf
Flag as Inappropriate
Email this Book

Evidence of Standing Waves During a Pi2 Pulsation Event Observed on Cluster : Volume 24, Issue 10 (20/10/2006)

By Collier, A. B.

Click here to view

Book Id: WPLBN0004001354
Format Type: PDF Article :
File Size: Pages 15
Reproduction Date: 2015

Title: Evidence of Standing Waves During a Pi2 Pulsation Event Observed on Cluster : Volume 24, Issue 10 (20/10/2006)  
Author: Collier, A. B.
Volume: Vol. 24, Issue 10
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


APA MLA Chicago

Blomberg, L. G., Sutcliffe, P. R., Collier, A. B., & W. Hughe, A. R. (2006). Evidence of Standing Waves During a Pi2 Pulsation Event Observed on Cluster : Volume 24, Issue 10 (20/10/2006). Retrieved from

Description: School of Physics, University of KwaZulu-Natal, Durban, South Africa. Observations of Pi2 pulsations at middle and low latitudes have been explained in terms of cavity mode resonances, whereas transients associated with field-aligned currents appear to be responsible for the high latitude Pi2 signature.

Data from Cluster are used to study a Pi2 event observed at 18:09 UTC on 21 January 2003, when three of the satellites were within the plasmasphere (L=4.7, 4.5 and 4.6) while the fourth was on the plasmapause or in the plasmatrough (L=6.6). Simultaneous pulsations at ground observatories and the injection of particles at geosynchronous orbit corroborate the occurrence of a substorm.

Evidence of a cavity mode resonance is established by considering the phase relationship between the orthogonal electric and magnetic field components associated with radial and field-aligned standing waves. The relative phase between satellites located on either side of the geomagnetic equator indicates that the field-aligned oscillation is an odd harmonic. Finite azimuthal Poynting flux suggests that the cavity is effectively open ended and the azimuthal wave number is estimated as m~13.5.

Evidence of standing waves during a Pi2 pulsation event observed on Cluster

Saito, T., Sakurai, T., and Koyama, Y.: Mechanism of association between Pi2 pulsation and magnetospheric substorm, J. Atmos. Terr. Phys., 38, 1265–1277, 1976.; Sakurai, T. and McPherron, R. L.: Satellite Observations of Pi 2 Activity at Synchronous Orbit, J. Geophys. Res., 88, 7015–7027, 1983.; Akasofu, S.-I.: Polar and Magnetospheric Substorms, vol. 11 of Astrophysics and Space Science Library\/, D. Reidel, Dordrecht, Holland, 1968.; Akasofu, S.-I. (Ed.): Dynamics of the Magnetosphere, D. Reidel, 1980.; Allan, W.: Phase variation of ULF pulsations along the geomagnetic field-line, Planet. Space Sci., 30, 339–346, 1982.; Allan, W., Poulter, E. M., and White, S. P.: Hydromagnetic wave coupling in the magnetosphere–-Plasmapause effects on impulse-excited resonances, Planet. Space Sci., 34, 1189–1200, 1986.; Allan, W., Menk, F. W., Fraser, B. J., Li, Y., and White, S. P.: Are low-latitude Pi2 pulsations cavity/waveguide modes?, Geophys. Res. Lett., 23, 765–768, 1996.; Balogh, A., Dunlop, M. W., Cowley, S. W. H., Southwood, D. J., Thomlinson, J. G., Glassmeier, K. H., Musmann, G., Lühr, H., Buchert, S., Acu na, M. H., Fairfield, D. H., Slavin, J. A., Riedler, W., Schwingenschuh, K., and Kivelson, M. G.: The Cluster Magnetic Field Investigation, Space Sci. Rev., 79, 65–91, 1997.; Baumjohann, W. and Glaßmeier, K.-H.: The transient response mechanism and Pi2 pulsations at substorm onset–Review and outlook, Planet. Space Sci., 32, 1361–1370, 1984.; Behrens, J. and Glaßmeier, K.-H.: Deconvolution as a method for the separation of Pi2 pulsations from background field variations, J. Geophys., 59, 195–201, 1986.; Chen, L. and Hasegawa, A.: A Theory of Long-Period Magnetic Pulsations, 1. Steady State Excitation of Field Line Resonance, J. Geophys. Res., 79, 1024–1032, 1974.; Chi, P. J. and Russell, C. T.: Phase skipping and Poynting flux of continuous pulsations, J. Geophys. Res., 103, 29 479–29 492, 1998.; Cummings, W. D., Deforest, S. E., and McPherron, R. L.: Measurements of the Poynting Vector of Standing Hydromagnetic Waves at Geosynchronous Orbit, J. Geophys. Res., 83, 697–706, 1978.; Escoubet, C. P., Fehringer, M., and Goldstein, M.: The Cluster mission, Ann. Geophys., 19, 1197–1200, 2001.; Fukunishi, H.: Polarization Changes of Geomagnetic Pi 2 Pulsations Associated With the Plasmapause, J. Geophys. Res., 80, 98–110, 1975.; Glassmeier, K.-H., Buchert, S., Motschmann, U., Korth, A., and Pedersen, A.: Concerning the generation of geomagnetic giant pulsations by drift-bounce resonance ring current instabilities, Ann. Geophys., 17, 338–350, 1999.; Gupta, J. and Stening, R. J.: Some Characteristics of Irregular Micropulsations Pi2 at High Latitude Stations, Can. J. Phys., 49, 2338–2349, 1971.; Gustafsson, G., Boström, R., Holback, B., Holmgren, G., Lundgren, A., Stasiewicz, K., Åhlén, L., Mozer, F. S., Pankow, D., Harvey, P., Berg, P., Ulrich, R., Pedersen, A., Schmidt, R., Butler, A., Fransen, A. W. C., Klinge, D., Thomsen, M., Fälthammar, C.-G., Lindqvist, P.-A., Christenson, S., Holtet, J., Lybekk, B., Sten, T. A., Tanskanen, P., Lappalainen, K., and Wygant, J.: The Electric Field and Wave Experiment for the Cluster Mission, Space Sci. Rev., 79, 137–156, 1997.; Jacobs, J. A., Kato, Y., Matsushita, S., and Troitskaya, V. A.: Classification of Geomagnetic Micropulsations, J. Geophys. Res., 69, 180–181, 1964.; Keiling, A., Wygant, J. R., Cattell, C., Kim, K.-H., Russell, C. T., Milling, D. K., Temerin, M., Mozer, F. S., and Kletzing, C. A


Click To View

Additional Books

  • The Role of External Triggers in Flow Sh... (by )
  • Separatrix Regions of Magnetic Reconnect... (by )
  • Global Magnetospheric Response to an Int... (by )
  • An Observational Study of a Shallow Grav... (by )
  • Meteorological Impacts of Sea-surface Te... (by )
  • Ring Current Decay Time Model During Geo... (by )
  • A Diagnostic Study of Monsoon Energetics... (by )
  • On the Collocation Between Dayside Auror... (by )
  • Simultaneous Radar and Spaced Receiver V... (by )
  • Letter to the Editor: a Comparison of F-... (by )
  • Characteristics of the Near-tail Dawn Ma... (by )
Scroll Left
Scroll Right


Copyright © World Library Foundation. All rights reserved. eBooks from World Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.