Advertisement

Coronal Magnetic Field Measurements Through Gyroresonance Emission

  • Stephen M. White
Part of the Astrophysics and Space Science Library book series (ASSL, volume 314)

Abstract

This article reviews the use of gyroresonance emission at radio wavelengths to measure coronal magnetic fields. The spiralling motion of electrons in the 200–2000 G fields in the solar corona produces sufficient opacity to render the corona optically thick, making it easy to recognize such sources in microwave images from their coronal brightness temperatures. Where gyroresonance sources are present they may be used as sensitive probes of the magnetic field strength above active regions, and this unique capability is one of the strengths of radio observations. Typically a gyroresonance radio source shows the temperature on an optically thick surface of constant magnetic field within the corona. Since each radio frequency corresponds to a different magnetic field strength, the coronal structure can be “peeled away” by using different frequencies.

Keywords

Sun solar corona solar magnetic fields solar radio emission 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Akhmedov, Sh. B., Gelfreikh, G. B., Bogod, V. M., & Korzhavin, A. N. 1982, Solar Phys, 79Google Scholar
  2. Alissandrakis, C. E. & Kundu, M. R. 1984, A&A, 139, 271ADSGoogle Scholar
  3. Alissandrakis, C. E., Kundu, M. R., & Lantos, P. 1980, A&A, 82, 30ADSGoogle Scholar
  4. Amari, T., Boulmezaoud, T. Z., & Mikic, Z. 1999, A&A, 350, 1051ADSGoogle Scholar
  5. Aschwanden, M. J. & Bastian, T. S. 1994, ApJ, 426, 425ADSCrossRefGoogle Scholar
  6. Bornatici, M., Cano, R., de Barbieri, O., & Engelmann, F. 1983, Nucl. Fusion, 23, 1153CrossRefGoogle Scholar
  7. Bray, R. J. & Loughhead, R. E. 1964, Sunspots, Chapman & Hall, LondonGoogle Scholar
  8. Brosius, J. W. & Holman, G. D. 1989, ApJ, 342, 1172CrossRefADSGoogle Scholar
  9. Chiuderi Drago, F., Alissandrakis, C. E., & Hagyard, M. 1987, Solar Phys, 112, 89CrossRefADSGoogle Scholar
  10. Gary, D. E. & Hurford, G. J. 1994, ApJ, 420, 903CrossRefADSGoogle Scholar
  11. Gary, D. E., Zirin, H., & Wang, H. 1990, ApJ, 355, 321CrossRefADSGoogle Scholar
  12. Gary, G. A. 1989, ApJ Supp., 69, 323.ADSCrossRefGoogle Scholar
  13. Gelfreikh, G. B. & Lubyshev, B. I. 1979, Sov. Astron., 23, 316ADSGoogle Scholar
  14. Ginzburg, V. L. & Zheleznyakov, V. V. 1961, Sov. Astron., 5, 1ADSGoogle Scholar
  15. Hurford, G. J. 1986, in Solar Flares and Coronal Physics Using P/OF as a Research Tool, (Tandberg-Hanssen, E., Wilson, R. M., and Hudson, H. S., eds.), NASA Conf. Pub. 2421, 191Google Scholar
  16. Jiao, L., McClymont, A. N., & Mikić, Z. 1997, Solar Phys, 174, 311CrossRefADSGoogle Scholar
  17. Kakinuma, T. & Swarup, G. 1962, ApJ, 136, 975CrossRefADSGoogle Scholar
  18. Klimchuk, J. A. 2000, Solar Phys, 193, 53CrossRefADSGoogle Scholar
  19. Klimchuk, J. A. & Canfield, R. C. 1994, in Solar Active Region Evolution: Comparing Models with Observations, (Balasubramanian, K. S. & Simon, G. W., eds.), PASP Conf. Ser. 68, 233Google Scholar
  20. Krüger, A., Hildebrandt, J., & Fürstenberg, F. 1985, A&A, 143, 72ADSGoogle Scholar
  21. Lantos, P. 1972, Solar Phys, 22, 387CrossRefADSGoogle Scholar
  22. Lee, J., McClymont, A. N., Mikić, Z., White, S. M., & Kundu, M. R. 1998, ApJ, 501, 853CrossRefADSGoogle Scholar
  23. Lee, J., White, S. M., Gopalswamy, N., & Kundu, M. R. 1997, Solar Phys, 174, 175CrossRefADSGoogle Scholar
  24. Lee, J., White, S. M., Kundu, M. R., Mikić, Z., & McClymont, A. N. 1999, ApJ, 510, 413CrossRefADSGoogle Scholar
  25. Lee, J. W., Hurford, G. J., & Gary, D. E. 1993, Solar Phys, 144, 45ADSCrossRefGoogle Scholar
  26. Lin, H., Penn, M. J., & Tomczyk, S. 2000, ApJ, 541, L83CrossRefADSGoogle Scholar
  27. McClymont, A. N. & Mikić, Z. 1994, ApJ, 422, 899CrossRefADSGoogle Scholar
  28. Melrose, D. B. 1980, Plasma Astrophysics, Gordon and Breach, New YorkGoogle Scholar
  29. Metcalf, T. R., Jiao, L., McClymont, A. N., Canfield, R. C., & Uitenbroek, H. 1995, ApJ, 439, 474CrossRefADSGoogle Scholar
  30. Mok, Y., Lionello, R., Mikic, Z., & Linker, J. A. 2004, ApJ, submitted.Google Scholar
  31. Robinson, P. A. 1991, Solar Phys, 136, 343CrossRefADSGoogle Scholar
  32. Robinson, P. A. & Melrose, D. B. 1984, Aust. J. Phys., 37, 675ADSGoogle Scholar
  33. Schmahl, E. J., Kundu, M. R., Strong, K. T., Bentley, R. D., Smith, J. B., & Krall, K. R. 1982, Solar Phys, 80, 233CrossRefADSGoogle Scholar
  34. Schmelz, J. T., Holman, G. D., Brosius, J. W., & Willson, R. F. 1994, ApJ, 434, 786CrossRefADSGoogle Scholar
  35. Semel, M. & Skumanich, A. 1998, A&A, 331, 383ADSGoogle Scholar
  36. Shibasaki, K., Enome, S., Nakajima, H., Nishio, M., Takano, T., Hanaoka, Y., Torii, C., Sekiguchi, H.,, Kawashima, S., Bushimata, T., Shinohara, N., Koshiishi, H., Shiomi, Y., Irimajiri, Y., Leka, K. D., & Canfield, R. C. 1994, Publ. Astron. Soc. Japan, 46, L17ADSGoogle Scholar
  37. Vourlidas, A. 1996, Ph. D. thesis, New Mexico Inst. of Mining and Technology, unpublished.Google Scholar
  38. White, S. M. & Kundu, M. R. 1997, Solar Phys, 174, 31CrossRefADSGoogle Scholar
  39. White, S. M., Kundu, M. R., & Gopalswamy, N. 1991, ApJ, 366, L43CrossRefADSGoogle Scholar
  40. White, S. M., Kundu, M. R., & Gopalswamy, N. 1992, ApJ Supp., 78, 599ADSCrossRefGoogle Scholar
  41. Zheleznyakov, V. V. 1962, Sov. Astron. J., 6, 3ADSGoogle Scholar
  42. Zheleznyakov, V. V. 1970, Radio Emission of the Sun and the Planets, Pergamon Press Ltd., OxfordGoogle Scholar
  43. Zlotnik, E. Ya. 1968a, Sov. Astron., 12, 245ADSGoogle Scholar
  44. Zlotnik, E. Ya. 1968b, Sov. Astron., 12, 464ADSGoogle Scholar
  45. Zlotnik, E. Ya., Kundu, M. R., & White, S. M. 1996, Radiophysics and Quantum Electronics, 39, 255CrossRefADSGoogle Scholar

Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Stephen M. White
    • 1
  1. 1.Department of AstronomyUniversity of MarylandCollege ParkUSA

Personalised recommendations