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Solar Physics

, Volume 48, Issue 2, pp 361–380 | Cite as

Direction-finding measurements of type III radio bursts out of the ecliptic plane

  • Mark M. Baumback
  • William S. Kurth
  • Donald A. Gurnett
Article

Abstract

Direction-finding measurements with the plasma wave experiments on the HAWKEYE 1 and IMP 8 satellites are used to find the source locations of type III solar radio bursts in heliocentric latitude and longitude in a frequency range from 31.1 kHz to 500 kHz. IMP 8 has its spin axis perpendicular to the ecliptic plane; hence, by analyzing the spin modulation of the received signals the location of the type III burst projected into the ecliptic plane can be found. HAWKEYE 1 has its spin axis nearly parallel to the ecliptic plane; hence, the location of the source out of the ecliptic plane may also be determined. Using an empirical model for the emission frequency as a function of radial distance from the sun the three-dimensional trajectory of the type III radio source can be determined from direction-finding measurements at different frequencies. Since the electrons which produce these radio emissions follow the magnetic field lines from the Sun these measurements provide information on the three-dimensional structure of the magnetic field in the solar wind. The source locations projected into the ecliptic plane follow an Archimedean spiral. Perpendicular to the ecliptic plane the source locations usually follow a constant heliocentric latitude. When the best fit magnetic field line through the source locations is extrapolated back to the Sun this field line usually originates within a few degrees from the solar flare which produced the radio burst. With direction-finding measurements of this type it is also possible to determine the source size from the modulation factor of the received signals. For a type III event on June 8, 1974, the half angle source size was measured to be ∼60° at 500 kHz and ∼40° at 56.2 kHz as viewed from the Sun.

Keywords

Flare Solar Wind Source Location Solar Flare Radio Emission 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Alexander, J. K., Malitson, H. H., and Stone, R. G.: 1969, Solar Phys. 8, 388.Google Scholar
  2. Alvarez, H., Haddock, F. T., and Lin, R. P.: 1972, Solar Phys. 26, 468.Google Scholar
  3. Alvarez, H., Lin, R. P., and Bame, S. J.: 1975, Solar Phys. 44, 485.Google Scholar
  4. Coleman, P. J. Jr. and Rosenberg, R. L.: 1971, J. Geophys. Res. 76, 2917.Google Scholar
  5. Fainberg, J., Evans, L. G., and Stone, R. G.: 1972, Science 178, 743.Google Scholar
  6. Fainberg, J. and Stone R. G.: 1970, Solar Phys. 15, 433.Google Scholar
  7. Fainberg, J. and Stone, R. G.: 1971, Solar Phys. 17, 392.Google Scholar
  8. Fainberg, J. and Stone, R. G.: 1974, Space Sci. Rev. 16, 145.Google Scholar
  9. Frank, L. A. and Gurnett, D. A.: 1972, Solar Phys. 27, 446.Google Scholar
  10. Ginzburg, V. L. and Zhelezniakov, V. V.: 1958, Sov. Astron.-AJ 2, 653.Google Scholar
  11. Gurnett, D. A. and Frank, L. A.: 1975, Solar Phys. 45, 477.Google Scholar
  12. Haddock, F. T. and Alvarez, H.: 1973, Solar Phys. 29, 183.Google Scholar
  13. Haddock, F. T. and Graedel, T. E.: 1970, Astrophys. J. 160, 293.Google Scholar
  14. Hartz, T. R.: 1964, Ann. Astrophys. 27, 831.Google Scholar
  15. Hartz, T. R.: 1969, Planet. Space Sci. 17, 267.Google Scholar
  16. Kaiser, M. L.: 1975, The Solar Elongation Distribution of Low Frequency Radio Bursts, Goddard Space Flight Center preprint X-693-75-99.Google Scholar
  17. Kundu, M. R.: 1965, Solar Radio Astronomy, Interscience, New York.Google Scholar
  18. Lin, R. P.: 1970, Solar Phys. 12, 266.Google Scholar
  19. Lin, R. P.: 1974, Space Sci. Rev. 16, 189.Google Scholar
  20. Lin, R. P., Evans, L. G., and Fainberg, J.: 1973, Astrophys. Lett. 14, 191.Google Scholar
  21. Newkirk, G. Jr.: 1967, Ann. Rev. Astron. Astrophys. 5, 213.Google Scholar
  22. NOAA: December 1974, Solar-Geophysical Data 364, Part II.Google Scholar
  23. NOAA: January 1975, Solar-Geophysical Data 365, Part II.Google Scholar
  24. Parker, E. N.: 1963, Interplanetary Dynamical Processes, Interscience, New York.Google Scholar
  25. Parker, E. N.: 1964, ‘The penetration of Galactic Cosmic Rays into the Solar System’, in The Solar Wind, Pergamon Press, Oxford.Google Scholar
  26. Parker, E. N.: 1965, Space Sci. Rev. 4, 666.Google Scholar
  27. Rosenberg, R. L. and Winge, C. R. Jr.: 1974, ‘The Latitude Dependencies of the Solar Wind’, Solar Wind Three, Institute of Geophysics and Planetary Physics, UCLA, 300.Google Scholar
  28. Schatten, K. H.: 1972, ‘Large-scale properties of the interplanetary Magnetic Field’, Solar Wind, NASA publication SP-308, 65.Google Scholar
  29. Schatten, K. H., Ness, N. F., and Wilcox, J. M.: 1968, Solar Phys. 5, 240.Google Scholar
  30. Slysh, V. I.: 1967, Cosmic Research (English transl.) 5, 759.Google Scholar
  31. Smith, D. F.: 1970, Adv. Astron. Astrophys. 7, 147.Google Scholar
  32. Smith, D. F.: 1974, Space Sci. Rev. 16, 91.Google Scholar
  33. Stone, R. G.: 1974, ‘Traveling Solar Radio Bursts’, in Solar Wind Three, Institute of Geophys. and Planetary Phys., UCLA, 72.Google Scholar
  34. Suess, S. T.: 1974, ‘Three Dimensional Modeling’, in Solar Wind Three, Institute of Geophys. and Planetary Phys., UCLA, 311.Google Scholar
  35. Suess, S. T., Hundhausen, A. F., and Pizzo, V.: 1975, J. Geophys. Res. 80, 2023.Google Scholar
  36. Suess, S. T. and Nerney, S. F.: 1975, Geophys. Res. Lett. 2, 75.Google Scholar
  37. Van Allen, J. A. and Krimigis, S. M.: 1965, J. Geophys. Res. 70, 5737.Google Scholar
  38. Wild, J. P.: 1950, Aust. J. Sci. Res. A3, 541.Google Scholar
  39. Wild, J. P. and McCready, L. L.: 1950, Aust. J. Sci. Res. A3, 387.Google Scholar
  40. Wild, J. P., Murray, J. D., and Rowe, W. C.: 1954, Aust. J. Phys. 7, 439.Google Scholar
  41. Wild, J. P., Sheridan, K. V., and Neylan, A. A.: 1959, Aust. J. Phys. 12, 369.Google Scholar

Copyright information

© D. Reidel Publishing Company 1976

Authors and Affiliations

  • Mark M. Baumback
    • 1
  • William S. Kurth
    • 1
  • Donald A. Gurnett
    • 1
  1. 1.Department of Physics and AstronomyThe University of IowaIowa CityU.S.A.

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