- Open Access
Ground magnetic perturbations associated with the standing toroidal mode oscillations in the magnetosphere-ionosphere system
Earth, Planets and Space volume 52, pages 601–613 (2000)
The behavior of toroidal mode oscillations of standing Alfvén waves (refer to as standing Alfvén oscillations) in the coupled magnetosphere-ionosphere system is investigated using a trapezoid-shape magnetosphere model. It is found that the magnetic perturbation is transmitted across the ionosphere differently in the two cases where the ionospheric electric field perturbation is static (Pedersen conductivity > Hall conductivity) and where it is inductive (Pedersen conductivity < Hall conductivity). It is noted that the ionospheric Hall current for the inductive condition shields the magnetic field perturbation. The north-south asymmetry of the conjugate ground magnetic perturbations is calculated by using a trapezoid model with the ionospheric and magnetospheric parameters based on the IGRF and IRI. It is revealed that the ionospheric electric field is almost static for the fundamental mode oscillation, whereas inductive for the higher harmonic ones. It is also found that the north-south asymmetry of the ground magnetic perturbations depends not only on the L-value but also on magnetic longitude; this is because the ionosphere and magnetic field conditions are not uniform as a function of longitude.
Allan, W., Transient ULF pulsations: time dependence of magnetic fields observed at the ground, Ann. Geophys., 13, 938–945, 1995.
Allan, W. and F. B. Knox, A dipole field model for axisymmetric Alfvén waves with finite ionosphere conductivities, Planet. Space Sci., 27, 79–85, 1979a.
Allan, W. and F. B. Knox, The effect of finite ionosphere conductivities on axisymmetric toroidal Alfvén wave resonances, Planet. Space Sci., 27, 939–950, 1979b.
Bilitza, D., International Reference Ionosphere 1990, National Space Science Data center/World Data Center-A for Rockets and Satellites, 1990.
Buchert, S. C. and F. Budnik, Field-aligned current distributions generated by a divergent Hall current, Geophys. Res. Lett., 24, 297–300, 1997.
Chen, L. and A. Hasegawa, A theory of long-period magnetic pulsations 1. Steady state excitation of field line resonance, J. Geophys. Res., 79, 1024–1032, 1974.
Fujita, S., Modification of magnetic signals of short-period pulsations by the ionosphere, Mem. Nat. Inst. Polar Res., Special Issue, 36, 287–296, 1985.
Hughes, W. J. and D. J. Southwood, The screening of micropulsation signals by the atmosphere and ionosphere, J. Geophys. Res., 81, 3234–3240, 1976a.
Hughes, W. J. and D.J. Southwood, An illustration of modification of geomagnetic pulsation structure by the ionosphere, J. Geophys. Res., 81, 3241–3247, 1976b.
IAGA Division V, Working Group 8, International Geomagnetic Field, 1995 Revision, J. Geomag. Geoelectr., 47, 1257–1261, 1995.
Inoue, Y. and S. Horowitz, Magneto-ionic coupling in an inhomogeneous anisotropic medium, Radio Sci., 1, 427–440, 1966a.
Inoue, Y. and S. Horowitz, Numerical solution of full-wave equation with mode coupling, Radio Sci., 1, 957–970, 1966b.
Itonaga, M., A. Yoshikawa, and T.-I. Kitamura, Interaction between hydromagnetic waves and the anisotropically conducting ionosphere, J. Geomag. Geoelectr., 47, 459–474, 1995.
Lee, D.H. and R. L. Lysak, Magnetospheric ULF wave coupling in the dipole model: the impulsive excitation, J. Geophys. Res., 94, 17097–17103, 1989.
Newton, R. S., D. J. Southwood, and W. J. Hughes, Damping of geomagnetic pulsations by the ionosphere, Planet. Space Sci., 26, 201–209, 1978.
Nishida, A., Ionospheric screening effect and storm sudden commencement, J. Geophys. Res., 69, 1861–1874, 1964.
Nishida, A., Geomagnetic Diagnosis of the Magnetosphere, 256 pp., Springer Verlag, New York, 1978.
Poulter, E. M. and W. Allan, Transient ULF pulsation decay rates observed by ground based magnetometers: The contribution of spatial integration, Planet. Space Sci., 33, 607–616, 1985.
Rees, D., COSPER International Reference Atmosphere: 1986 Part I: Thermosphere Models, Advances in Space Research, 8, 1988.
Saito, H., N. Sato, Y. Tonegawa, T. Yoshino, and T. Saemundsson, Seasonal and diurnal dependence of Pc 3–5 magnetic pulsation power at geomagnetically conjugate stations in the auroral zones, J. Geophys. Res., 94, 6945–6948, 1989.
Samson, J. C. and G. Rostoker, Latitude-dependent characteristics of high-latitude Pc 4 and Pc 5 micropulsations, J. Geophys. Res., 77, 6133–6144, 1972.
Southwood, D. J., Some features of field line resonances in the magnetosphere, Planet. Space Sci., 22, 483–491, 1974.
Tamao, T, The structure of three-dimensional hydromagnetic waves in a uniform cold plasma, J. Geomag. Geoelectr., 16, 89–114, 1964.
Tamao, T, Transmission and coupling resonance of hydromagnetic disturbances in the non-uniform earth’s magnetosphere, Sci. Rep. Res. Inst. Tohoku Univ. Geophy., 17, 43–72, 1965.
Tamao, T, Magnetosphere-ionosphere interaction through hydromagnetic waves, Proc. Conf. Achievements of the IMS, 26–28 June 1984, Graz, Austria, ESA SP-217, 427–435, 1984.
Tamao, T, Direct contribution of oblique field-aligned currents to ground magnetic fields, J. Geophys. Res., 91, 183–189, 1986.
Yoshikawa, A. and M. Itonaga, Reflection of shear Alfvén waves at the ionosphere and the divergent Hall current, Geophys. Res. Lett., 23, 101–104, 1996.
Yoshikawa, A., M. Itonaga, and T. Kitamura, Effect of the ionospheric induction current on magnetohydrodynamic waves in the magnetosphere, Proc. NIPR Symp. Upper Atmos. Phys., 8, 49–59, 1995.
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, 28437–28457, 1999.
Yumoto, K., Y. Tanaka, T. Oguti, K. Shiokawa, Y. Yoshimura, A. Isono, B. J. Fraser, F. W. Menk, J. W. Lynn, M. Seto, and 210° MM Magnetic Observation Group, Globally coordinated magnetic observations along 210° magnetic meridian during STEP period: 1. Preliminary results of low-latitude Pc3’s, J. Geomag. Geoelectr., 44, 261–276, 1992.
Yumoto, K., A. Isono, K. Shiokawa, H. Matsuoka, Y. Tanaka, F. W. Menk, B. J. Fraser, and 210° Magnetic Meridian Magnetic Observation Group, Global cavity mode-like and localized field-line Pc3–4 oscillations stimulated by interplanetary impulses (Si/Sc): Initial results from the 210° MM magnetic observations, in Solar Wind Sources of Magnetospheric Ultra-Low-Frequency Waves, Geophys. Monogr, vol. 81, edited by M. J. Engebretson, K. Takahashi, and M. Scholer, pp. 335–344, AGU, Washington, D.C., 1994.
Ziesolleck, C. W. S., B. J. Fraser, F. W. Menk, and P. W. McNabb, Spatial characteristics of low-latitude Pc3–4 geomagnetic pulsations, J. Geophys. Res., 98, 197–207, 1993.
Now at Solar-Terrestrial Environment Laboratory, Nagoya University, 3-13, Honohara, Toyokawa, 442-8507, Japan.
About this article
Cite this article
Nakata, H., Fujita, S., Yoshikawa, A. et al. Ground magnetic perturbations associated with the standing toroidal mode oscillations in the magnetosphere-ionosphere system. Earth Planet Sp 52, 601–613 (2000). https://doi.org/10.1186/BF03351669
- Magnetic Inclination
- Inductive Condition
- Conjugate Point
- Hall Current
- Magnetic Perturbation