Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
권호 표지
DOI QR코드

DOI QR Code

ESTIMATE OF CORONAL MAGNETIC FIELD STRENGTH USING PLASMOID ACCELERATION MEASUREMENT

  • Jang, Min-Hwan (Department of Astronomy and Space Science, Kyung Hee University) ;
  • Choe, G.S. (School of Space Research, Kyung Hee University) ;
  • Lee, K.S. (Department of Astronomy and Space Science, Kyung Hee University) ;
  • Moon, Y.J. (School of Space Research, Kyung Hee University) ;
  • Kim, Kap-Sung (School of Space Research, Kyung Hee University)
  • Published : 2009.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

A method of estimating the lower bound of coronal magnetic field strength in the neighborhood of an ejecting plasmoid is presented. Based on the assumption that the plasma ejecta is within a magnetic island, an analytical expression for the force acting on the ejecta is derived. The method is applied to a limb coronal mass ejection event, and a lower bound of the magnetic field strength just below the CME core is estimated. The method is expected to provide useful information on the strength of reconnecting magnetic field if applied to X-ray plasma ejecta.

Keywords

References

  1. Batchelor, G. K., 1967, An Introduction to Fluid Dynamics (Cambridge: Cambridge University Press)
  2. Billings, D. E., 1966, A Guide to the Solar Corona (New York: Academic Press)
  3. Cargill, P. J., 2009, Coronal Magnetism: Difficulties and Prospects, Space Sci. Rev., 144, 413 https://doi.org/10.1007/s11214-008-9446-9
  4. Chen, J., et al., 2000, Magnetic Geometry and Dynamics of the Fast Coronal Mass Ejection of 1997 September 9, ApJ, 533, 481 https://doi.org/10.1086/308646
  5. Cho, K.-S., Lee, J., Gary, D. E., Moon, Y.-J., & Park, Y. D. 2007, Magnetic Field Strength in the Solar Corona from Type II Band Splitting, ApJ, 665, 799 https://doi.org/10.1086/519160
  6. Choe, G. S. & Cheng, C. Z., 2000, A Model of Solar Flares and Their Homologous Behavior, ApJ, 541, 449 https://doi.org/10.1086/309415
  7. Choe, G. S. & Lee, L. C., 1996, Evolution of Solar Magnetic Arcades. II. Effect of Resistivity and Solar Eruptive Processes, ApJ, 472, 372 https://doi.org/10.1086/178070
  8. Howard, R. A., Sheeley, N. R., Jr., Michels, D. J., & Koomen, M. J., 1985, Coronal Mass Ejections –1979-1981, J. Geophys. Res., 90, 8173 https://doi.org/10.1029/JA090iA09p08173
  9. Hundhausen, A. J., 1999, Coronal Mass Ejections, in The Many Faces of the Sun: A Summary of the Results from NASA's Solar Maximum Mission, ed. K. T. Strong, J. L. R. Saba, B. M. Haisch, & J. T. Schmelz (New York: Springer-Verlag), 143
  10. Judge, P. G., Casini, R., Tomczyk, S., Edwards, D. P., & Francis, E., 2001, Coronal Magnetometry: A Feasibility Study, NCAR/TN-446+STR (Boulder: National Center for Atmospheric Research)
  11. Kim, Y.-H., Bong, S.-C., Park, Y. D., Cho, K.-S., Moon, Y.-J., & Suematsu, Y., 2008, Estimation of Spicule Magnetic Field Using Observed MHDWaves by the Hinode SOT, JKAS, 41, 173 https://doi.org/10.5303/JKAS.2008.41.6.173
  12. Kim, Y.-H., Moon, Y.-J., Cho, K.-S., Kim, K.-S., & Park, Y. D., 2005, A Study of Flare-associated XRay Plasma Ejections. I. Association with Coronal Mass Ejections, ApJ, 622, 1240 https://doi.org/10.1086/428031
  13. Klein, K.-L., Khan, J. I., Vilmer, N., Delouis, J.-M., & Aurass, H., 1999, X-ray and Radio Evidence on the Origin of a Coronal Shock Wave, A&A, 346, L53
  14. Lee, J., 2007, Radio Emissions from Solar Active Regions, Space Sci. Rev., 133, 73 https://doi.org/10.1007/s11214-007-9206-2
  15. Lin, H., Kuhn, J. R., & Coulter, R., 2004, Coronal Magnetic Field Measurements, ApJ, 613, L177 https://doi.org/10.1086/425217
  16. Lin, H., Penn, M. J., & Tomczyk, S., 2000, A New Precise Measurement of the Coronal Magnetic Field Strength, ApJ, 541, L83 https://doi.org/10.1086/312900
  17. Lugaz, N., Manchester, W. B., IV, & Gombosi, T. I., 2005, The Evolution of Coronal Mass Ejection Density Structures, ApJ, 627, 1019 https://doi.org/10.1086/430465
  18. Ohyama, M., & Shibata, K. 1998, X-Ray Plasma Ejection Associated with an Impulsive Flare on 1992 October 5: Physical Conditions of X-Ray Plasma Ejection, ApJ, 499, 934 https://doi.org/10.1086/305652
  19. Petschek, H. E., 1964, Magnetic Field Annihilation, in Proceedings of the AAS-NASA Symposium on the Physics of Solar Flares, NASA Special Publication 50, ed. W. N. Hess (Washington, DC: NASA), 425
  20. Poland, A. I., Howard, R. A., Koomen, M. J., Michels, D. J., & Sheeley, N. R., Jr., 1981, Coronal Transients near Sunspot Maximum, Sol. Phys., 69, 169 https://doi.org/10.1007/BF00151264
  21. Shibata, K., Masuda, S., Hara, H., Yokoyama, T., Tsuneta, S., Kosugi, T., & Ogwara, Y., 1995, Hot-Plasma Ejections Associated with Compact-Loop Solar Flares, ApJ, 451, L83 https://doi.org/10.1086/309688
  22. Smerd, S. F., Sheridan, K. V., & Stewart, R. T., 1975, Split-Band Structure in Type II Radio Bursts from the Sun, Astrophys. Lett., 16, 23
  23. Solanki, S. K., 1993, Smallscale Solar Magnetic Fields – an Overview, Space Sci. Rev., 63, 1 https://doi.org/10.1007/BF00749277
  24. Sturrock, P. A., 1992, The Emerging Picture of Eruptive Solar Flares, in Eruptive Solar Flares, IAU Colloquium 133, Lecture Notes in Physics, 399, ed. Z. ˇSvestka, B. V. Jackson, & M. E. Machado (Berlin: Springer-Verlag), 397
  25. Tomczyk, S., et al., 2008, An Instrument to Measure Coronal Emission Line Polarization, Sol. Phys., 247, 411 https://doi.org/10.1007/s11207-007-9103-6
  26. Vourlidas, A., Subramanian, P., Dere, K. P., & Howard, R. A., 2000, Large-Angle Spectrometric Coronagraph Measurements of the Energetics of Coronal Mass Ejections, ApJ, 534, 456 https://doi.org/10.1086/308747
  27. Yashiro, S., Gopalswamy, N., Michalek, G., St. Cyr, O. C., Plunkett, S. P., Rich, N. B., & Howard, R. A., 2004, A Catalog of White Light Coronal Mass Ejections Observed by the SOHO Spacecraft, J. Geophys. Res., 109, 7105