Skip to main content
Earth, Planets and Space
Download PDF
  • E-Letter
  • Published:

Effects of ionospheric damping on MHD wave mode structure

Earth, Planets and Space volume 56, pages e33–e36 (2004)Cite this article

Abstract

We calculate the mode structure of magnetospheric MHD waves on a meridional plane. We have added the effect of ionospheric dissipation to the three-dimensional dipole field MHD model of Lee and Lysak (1999); this model allows a realistic Alfven speed profile for the plasmasphere and realistic boundary conditions at the outer boundaries that vary with respect to local time. Using power spectra and plots of spatial mode structure, we show that the two-dimensional transverse modes on the dipolar meridian are strongly affected by ionospheric damping, but the compressional modes are not. The location of field line resonances spreads wide as the damping increases, but the compressional mode structure remains stable.

References

  • Allan, W., Phase variation of ULF pulsations along a geomagnetic field line, Planet. Space Sci., 30, 339, 1982.

    Article  Google Scholar 

  • Allan, W. and F. B. Knox, The effects of finite ionospheric conductivities on axisymmetric toroidal Alfven waves resonances, Planet. Space Sci., 27, 939, 1979.

    Article  Google Scholar 

  • Baransky, L. N., J. E. Borovkov, M. B. Gokhberg, S. M. Krylov, and V. A. Troitskaya, High resolution method of direct measurement of the magnetic field lines’ eigenfrequencies, Planet. Space Sci., 33, 1369, 1985.

    Article  Google Scholar 

  • Budnik, F., M. Stellmacher, K.-H. Glassmeier, and S. C. Buchert, Ionospheric conductance distribution and MHD wave structure: Observation and model, Ann. Geophysicae, 16, 140, 1998.

    Article  Google Scholar 

  • Chappell, C. R., The terrestrial plasma source: A new perspective in solar-terrestrial processes from Dynamics Explorer, Rev. Geophys., 26, 229, 1988.

    Article  Google Scholar 

  • Chi, P. J. and Russell, An interpretation of the cross-phase spectrum of geomagnetic pulsations by the field line resonance theory, Geophys. Res. Lett., 25, 4445, 1998.

    Article  Google Scholar 

  • Denton, R. E., M. R. Lessard, R. Anderson, E. G. Miftakhova, and J. W. Hughes, Determining the mass density along magnetic field lines from toroidal eigenfrequencies: Polynomial expansion applied to CRRES data, J. Geophys. Res., 106, 29,915, 2001.

    Article  Google Scholar 

  • Ellis, P. and D. J. Southwood, Reflection of Alfven waves by nonuniform ionospheres, Planet. Space Sci., 31, 10,717, 1983.

    Article  Google Scholar 

  • Fujita, S., T. Mizuta, M. Itonaga, A. Yoshikawa, and H. Nakata, Propagation property of transient MHD impulses in the magnetosphere-ionosphere system: The 2D model of the Pi2 pulsation, Geophys. Res. Lett., 28, 2161, 2001.

    Article  Google Scholar 

  • Hughes, J.W. and D. J. Southwood, The screening of micropulsation signals by the atmosphere and ionosphere, J. Geophys. Res., 81, 3234, 1976.

    Article  Google Scholar 

  • Lee, D. H. and K. Kim, Compressional MHD waves in the magnetosphere: A new approach, J. Geophys. Res., 104, 12,379, 1999.

    Article  Google Scholar 

  • Lee, D. H. and R. L. Lysak, Magnetospheric ULF wave coupling in the dipole model: The impulsive excitation, J. Geophys. Res., 94, 17,097, 1989.

    Article  Google Scholar 

  • Lee, D. H. and Lysak, MHD waves in a three-dimensional dipolar magnetic field: A search for Pi2 pulsations, J. Geophys. Res., 104, 28,691, 1999.

    Article  Google Scholar 

  • Newton, R. S., D. J. Southwood, and W. Hughes, Damping of geomagnetic pulsations by the ionosphere, Planet. Space Sci., 26, 201, 1978.

    Article  Google Scholar 

  • Osaki, H., K. Takahashi, H. Fukunishi, T. Nagatsuma, Oya, A. Matsuoka, and D. K. Milling, Pi2 pulsations observed from the Akebono satellite in the plasmasphere, J. Geophys. Res., 103, 17,605–17,615, 1998.

    Article  Google Scholar 

  • Southwood, D. J. and M. G. Kivelson, Damping standing Alfve’n waves in the magnetosphere, J. Geophys. Res., 106, 10,829, 2001.

    Article  Google Scholar 

  • Sutcliffe, P. R. and K. Yumoto, On the cavity mode nature of low-latitude Pi 2 pulsations, J. Geophys. Res., 96, 1543, 1991.

    Article  Google Scholar 

  • Takahashi, K., Ohtani, and B. J. Anderson, Statistical analysis of Pi 2 pulsations observed by the AMPTE CCE spacecraft in the inner magnetosphere, J. Geophys. Res., 100, 21,929, 1995.

    Article  Google Scholar 

  • Takahashi K., D.-H. Lee, M. Nose’, Anderson, and W. J. Hughes, CRRES electric field study of the radial mode structure of Pi2 pulsations, J. Geophys. Res., 108, 1210, doi:10.1029/2002JA009761, 2003.

    Article  Google Scholar 

  • Waters, C. L., F. W. Menk, and B. J. Fraser, Low latitude geomagnetic field line resonance: Experiment and modeling, J. Geophys. Res., 99, 17,547, 1995.

    Article  Google Scholar 

  • Yeoman, T. K. and D. Orr, Phase and spectral power of mid-latitude Pi 2 pulsations: Evidence for a plasmaspheric cavity resonance, Planet. Space Sci., 37, 1367, 1989.

    Article  Google Scholar 

  • Yoshikawa, A., M. Itonaga, S. Fujita, H. Nakata, and K. Yumoto, Eigenmode analysis of field line oscillations interacting with the ionosphere-atmosphere-solid earth electromagnetic coupled system, J. Geophys. Res., 104, 28,437, 10.1029/1999JA900287, 1999.

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Department of Astronomy and Space Science, Kyung Hee University, Korea

    D. -H. Lee & K. -H. Kim

  2. Department of Physics and Astronomy, Dartmouth College, USA

    R. E. Denton

  3. The Johns Hopkins University Applied Physics Laboratory, USA

    K. Takahashi

Authors
  1. D. -H. Lee
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. K. -H. Kim
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. R. E. Denton
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. K. Takahashi
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to D. -H. Lee.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Lee, D.H., Kim, K.H., Denton, R.E. et al. Effects of ionospheric damping on MHD wave mode structure. Earth Planet Sp 56, e33–e36 (2004). https://doi.org/10.1186/BF03352541

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1186/BF03352541

Key words