DOI QR코드

DOI QR Code

PROPAGATION OF SUDDEN IMPULSES IN A DIPOLAR MAGNETOSPHERE

  • LEE DONG-HUN (Department of Astronomy & Space Science and Institute of Natural Sciences Kyung Hee University) ;
  • SUNG SUK-KYUNG (Department of Astronomy & Space Science and Institute of Natural Sciences Kyung Hee University)
  • 발행 : 2003.06.01

초록

The magnetosphere is often perturbed by impulsive input such as interplanetary shocks and solar wind discontinuities. We study how these initial perturbations are propagating within the magnetosphere over various latitude regions by adopting a three-dimensional numerical dipole model. We examine the wave propagation on a meridional plane in a time-dependent manner and compare the numerical results with multi-satellite and ground observations. The dipole model is used to represent the plasmasphere and magnetosphere with a realistic Alfven speed profile. It is found that the effects of refraction, which result from magnetic field curvature and inhomogeneous Alfven speed, are' found to become important near the plasmapause. Our results show that, when the disturbances are assumed at the subsolar point of the dayside magnetosphere, the travel time becomes smaller to the polar ionosphere compared to the equatorial ionosphere.

키워드

참고문헌

  1. Araki, T. 1977, Global structure of geomagnetic sudden commencements, Planet. Space Sci., 25, 373 https://doi.org/10.1016/0032-0633(77)90053-8
  2. Araki, T. 1994, A physical model of the geomagnetic sudden commencement, in Solar Wind Sources of Magnetospheric Ultra-Low-Frequency Waves, Geophys. Monogr. Ser., ed M. J. Engebretson, K. Takahashi, & M. Scholer, (Washington, D. C. : AGU), 81, pp. 183-200
  3. Araki, T., Fujitani, S., Emoto, M., Yumoto, K., Shiokawa, K., Ichinose, T., Luehr, H., Orr, D., Milling, D. K., Singer, H., Rostoker, G., Tsunomura, S., Yamada, Y.,& Liu, C. F. 1997, Anomalous sudden commencement on March 24, 1991, J. Geophys. Res., 102, 14075 https://doi.org/10.1029/96JA03637
  4. Burlaga, L. F., & Ogilvie, K. W. 1969, Causes of sudden commencements and impulses, J. Geophys. Res., 74, 2815 https://doi.org/10.1029/JA074i011p02815
  5. Chen, L., & Hasegawa, A. 1974, A theory of long-period magnetic pulsations, 1, Steady state excitation of field line resonance, J. Geophys. Res., 79, 1024 https://doi.org/10.1029/JA079i007p01024
  6. Francis, W. E., Green, M. J., & Dessler, A. J. 1959, Hydromagnetic propagation of sudden commencements of magnetic storms, J. Geophys. Res., 64, 1643 https://doi.org/10.1029/JZ064i010p01643
  7. Hasegawa, A., Tsui, K. H., & Assis, A. S. 1983, A theory of long-period magnetic pulsations, Geophys. Res. Lett., 10, 765 https://doi.org/10.1029/GL010i008p00765
  8. Hudson, M. K., Kotelnikov, A. D., Li, X., Roth, I., Temerin, M., Wygant, J., Blake, J. B., & Gussenhoven, M. S. 1995, Simulation of proton radiation belt formation during the March 24, 1991 SSC, Geophys. Res. Lett., 22, 291 https://doi.org/10.1029/95GL00009
  9. Hudson, M. K., Elkington, S. IL, Lyon, J. G., Marchenko, V. A., Roth, I., Temerin, M., & Gussenhoven, M. S. 1996, MHD/Particle simulations of radiation belt formation during a storm sudden commencement, in Radiation Belts: Models and Standards, Geophys. Monogr. Ser., ed Lemaire,J. F., Heynderickx, D., & Baker, D. N. (Washington, D. C. : AGU), 97, pp. 57-62 https://doi.org/10.1029/GM097p0057
  10. Kikuchi, T., & Araki, T. 1979a, Transient response of uniform ionosphere and preliminary reverse impulse of geomagnetic storm sudden commencement, J. Atmos. Terr. Phys., 41, 917 https://doi.org/10.1016/0021-9169(79)90093-X
  11. Kikuchi, T., & Araki, T. 1979b, Horizontal transmission of the polar electric field to the equator, J. Atmos. Terr. Phys., 41, 927 https://doi.org/10.1016/0021-9169(79)90094-1
  12. Knott, K., Pedersen, A., & Wedeken, U. 1985, GEOS2 electric field observations during a sudden commencement and subsequent substorms, J. Geophys. Res., 90, 1283 https://doi.org/10.1029/JA090iA02p01283
  13. Lee, D.-H., & Kim, K. 2000, Propagation of sudden impulses in the magnetosphere: Linear waves, Adv. Space Res., 25(7/8), 1531 https://doi.org/10.1016/S0273-1177(99)00666-3
  14. Lee, D.-H., & Hudson, M. K. 2001, Numerical studies on the propagation of sudden impulses in the dipolemagnetosphere, J. Geophys. Res., 106, 8435 https://doi.org/10.1029/2000JA000271
  15. Lee, D.-H., & Lysak, R. L. 1989, Magnetospheric ULF wave coupling in the dipole model: The impulsive excitation, J. Geophys. Res., 94, 17097 https://doi.org/10.1029/JA094iA12p17097
  16. Lee, D.-H., & Lysak, R. L. 1999, MHD waves in a threedimensional dipolar magnetic fie1d: A search for Pi2 pulsations, J. Geophys. Res., 104, 28691 https://doi.org/10.1029/1999JA900377
  17. Li, X., Roth, I., Temerin, M., Wygant, J., Hudson, M. K., & Blake, J. B. 1993, Simulation of the prompt energization and transport of radiation belt particles during the March 24, 1991 SSC, Geophys. Res. Lett., 20, 2423 https://doi.org/10.1029/93GL02701
  18. Lysak, R. L., Song, Y., & Lee, D.-H. 1994, Generation of ULF waves by fluctuations in the magnetopause position, in Solar Wind Sources of Magnetospheric Ultra-Low-Frequency Waves, Geophys. Monogr. Ser., ed Engebretson, M. J., Takahashi, K., & Scholer, M. (Washington, D. C. : AGU), 81, pp. 273-281 https://doi.org/10.1029/GM081p0273
  19. Nishida, A. 1964, Ionospheric screening effects and sudden commencements, J. Geophys. Res., 69, 1761
  20. Nopper, R. W., Jr., Hughes, W. J., Maclennan, C. G., & McPherron, R. L. 1982, Impulse-excited pulsations during the July 29, 1977, event, J. Geophys. Res., 87, 5911 https://doi.org/10.1029/JA087iA08p05911
  21. Petrinec, S. M., K. Yumoto, H. L$\"{u}$hr, D. Orr, D. Milling, K. Hayashi, S. Kokubun, & Araki, T. 1996, The CME event of February 21, 1994: Response of the magnetic field at the Earth's surface, J. Geomagn. Geoelectr., 48, 1341
  22. Stegelmann, E. J., & von Keiischitzki, C. H. 1964, On the interpretation of the sudden commencement of geomagnetic storms, J. Geophys. Res., 69, 139 https://doi.org/10.1029/JZ069i001p00139
  23. Tamao, T. 1964, A htdromagnetic interpretation of geomagnetic SSC, Rep. lonos. Space Res. Jpn., 18, 16
  24. Wedeken, U., Voelker, H., Knott, K., & Lester, M. 1986, SSC-excited pulsations recorded near noon on GEOS 2 and on the ground (CDAW 6), J. Geophys. Res., 91, 3089 https://doi.org/10.1029/JA091iA03p03089
  25. Wilken, B., Goertz, C. K., Baker, D. N., Higbie, P. R., & Fritz, T. A. 1982, The SSC on July 29, 1977 and its propagation within the magnetosphere, J. Geophys. Res., 87, 5901 https://doi.org/10.1029/JA087iA08p05901
  26. Wilson, C. R., & Sugiura, M. 1961, Hydromagnetic interpretation of sudden commencements of magnetic storms, J. Geophys. Res., 66, 4097 https://doi.org/10.1029/JZ066i012p04097