Abstract
The presence of coronal magnetic fields connecting active regions is inferred from decimetric observations of solar noise storms with the Very Large Array (VLA) and from soft X-ray images taken by Yohkoh. Temporal changes in the noise storms appear to be correlated with some soft X-ray bursts detected by both Yohkoh and the GOES satellite. Combined analysis of the radio and X-ray data suggests a re-arrangement of the coronal magnetic field during the onset of impulsive noise storm burst emission. On one day during the combined VLA–Yohkoh–GOES observations, two widely-separated active regions appear to be connected by a faint trans-equatorial 91 cm source as well as two distinct soft X-ray loops. The two active regions show anti-correlated fluctuations in decimetric radio emission. On another day of combined VLA–Yohkoh observations, a series of 91 cm noise storm bursts are observed along the major axis of the associated noise storm continuum. Time sequences of Yohkoh soft X-ray images show a contraction of coronal loops prior to the onset of this series of bursts and a corresponding increase in the X-ray flux in the apparent footpoint of the overarching loop containing the noise storm. These observations imply that energy from a realignment of the magnetic field is being transferred, possibly by accelerated particles, along loops connecting separated active regions on the Sun.
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Bogod, V. M., Gelfreikh, G. B., Willson, R. F., Lang, K. R., Shatilov, V., and Tsvetkov, S. V.: 1992, Solar Phys. 141, 303.
Bogod, V. M., Garimov, V., Gelfreikh, G. B., Lang, K. R., Willson, R. F., and Kile, J. N.: 1995, Solar Phys. 160, 133.
Bray, R. J., Cram, L. E., Durrant, C. J., and Loughhead, R: E.: 1991, Plasma Loops in the Solar Corona, Cambridge University Press, Cambridge, p. 156.
Brueckner, G. E.: 1983, Solar Phys. 85, 243.
Daigne, G.: 1968, Nature 220, 567.
Hara, H., Tsuneta, S., Lemen, J. R., Acton, L. W., and McTiernan, J. M.: 1992, Publ. Astron. Soc. Japan 44, L135.
Hildner, E. et al.: 1986, in M. R. Kundu and B. E. (eds.), Energetic Phenomena on the Sun, NASA CP-2439, p. 6–1.
Hurford, G. J.: 1992, in J. T. Schmelz and J. C. Brown (eds.), The Sun: A Laboratory for Astrophysics, Kluwer Academic Publishers, Dordrecht, Holland, p. 299.
Kerdraon, A., Pick, M., Trottet, G., Sawyer, G., Illing, R., and House, L.: 1983, Astrophys. J. 265, L19.
Krucker, S., Benz, A. O., Aschwanden, M. J., and Bastian, T. S.: 1995, Solar Phys. 160, 151.
Kundu, M. R. and Gopalswamy, N.: 1990, Solar Phys. 129, 133.
Lang, K. R. and Willson, R. F.: 1987, Astrophys. J. 319, 514.
Lang, K. R., Willson, R. F., Kile, J. N., Lemen, J., Strong, K. T., Bogod, V. M., Gelfreikh, G. B., Ryabov, B. I., Hafizov, S. R., Abramov, V. E., and Svetkov, S. V.: 1993, Astrophys. J. 419, 398.
Lantos, P., Kerdraon, A., Rapley, G. G., and Bentley, R. D.: 1981, Astron. Astrophys. 10, 33.
McLean, D. J.: 1973, Proc. Astron. Soc. Australia 2, 227.
Raulin, J. P. and Klein, K.-L.: 1994, Astron. Astrophys. 281, 536.
Raulin, J. P., Willson, R. F., Kerdraon, A., Klein, K.-L., Lang, K. R., and Trottet, G.: 1991, Astron. Astrophys. 251, 298.
Sakurai, T.: 1982, Solar Phys. 76, 301.
Stewart, R. T., Brueckner, G. E., and Dere, K. P.: 1986, Solar Phys. 106, 107.
Tsuneta, S.: 1996, Astrophys. J. 456, L63.
Webb, D. F. and Kundu, M. R.: 1978, Solar Phys. 75, 305.
White, S. M., Thejappa, G., and Kundu, M. R.: 1992, Solar Phys. 138, 163.
Willson, R. F., Lang, K. R., and Gary, D. E.: 1993, Astrophys. J. 418, 490.
Willson, R. F., Kile, J. N., Donaldson, S., Lang, K. R., Bogod, V. M., Gelfreikh, G. B., Ryabov, B. I., and Hafizov, S. R.: 1996, Adv. Space Res. 17, 265.
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Willson, R.F., Kile, J.N. & Rothberg, B. VERY LARGE ARRAY OBSERVATIONS OF EVOLVING NOISE STORM SOURCES ON THE SUN. Solar Physics 170, 299–320 (1997). https://doi.org/10.1023/A:1004987224796
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DOI: https://doi.org/10.1023/A:1004987224796