Abstract
We report observations by the Large Angle Spectrometric Coronagraph (LASCO) on the SOHO spacecraft of three coronal green-line transients that could be clearly associated with coronal mass ejections (CMEs) detected in Thomson-scattered white light. Two of these events, with speeds >25 km s-1, may be classified as ‘whip-like’ transients. They are associated with the core of the white-light CMEs, identified with erupting prominence material, rather than with the leading edge of the CMEs. The third green-line transient has a markedly different appearance and is more gradual than the other two, with a projected outward speed <10 km s-1. This event corresponds to the leading edge of a ‘streamer blowout’ type of CME. A dark void is left behind in the emission-line corona following each of the fast eruptions. Both fast emission-line transients start off as a loop structure rising up from close to the solar surface. We suggest that the driving mechanism for these events may be the emergence of new bipolar magnetic regions on the surface of the Sun, which destabilize the ambient corona and cause an eruption. The possible relationship of these events to recent X-ray observations of CMEs is briefly discussed.
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Brueckner, G. E. and 14 co-authors: 1995, Solar Phys. 162, 357.
Delaboudinière, J.-P. and 27 co-authors: 1995, Solar Phys. 162, 291.
DeMastus, H. L., Wagner, W. J. and Robinson, R. D.: 1973, Solar Phys. 31, 449.
Dunn, R. B.: 1971, in C. Macris (ed.), Physics of the Solar Corona, D. Reidel Publ. Co., Dordrecht, Holland, p. 114.
Esser, R., Brickhouse, N. S., Habbal, S. R., Altrock, R. C., and Hudson, H. S.: 1995, J. Geophys. Res. 100, 19829.
Fisher, R. R.: 1977, Solar Phys. 55, 135.
Gopalswamy, N., Hanaoka, Y., Kundu, M. R., Enome, S., Lemen, J. R., Akioka, M., and Lara, A.: 1997, Astrophys. J. 475, 348.
Hiei, E., Hundhausen, A. J., and Sime, D. G.: 1993, Geophys. Res. Letters 20, 2785.
Howard, R. A., Sheeley, N. R., Jr., Koomen, M. J., and Michels, D. J.: 1985, J. Geophys. Res. 90, 8173.
Hudson, H. S., Acton, L. W., and Freeland, S. L.: 1996, Astrophys. J. 470, 629.
Hudson, H. S. and Webb, D. F.: 1997, in N. U. Crooker, J. A. Jocelyn, and J. Feynman (eds.), Coronal Mass Ejections: Causes and Consequences, AGU Geophysical Monograph Series, AGU, Washington, DC, in press.
Klimchuk, J. A., Acton, L. W., Harvey, K. L., Hudson, H. S., Kluge, K. L., Sime, D. G., Strong, K. T., and Watanabe, T.: 1994, in Y. Uchida, T. Watanabe, K. Shibata and H. S. Hudson (eds), X-ray Solar Physics from Yohkoh, Universal Academy Press, New York, p. 181.
Mason, H. E.: 1975, Monthly Notices Roy Astron. Soc. 170, 651.
Schwenn, R. and 23 co-authors: 1997, Solar Phys. 175, 667 (this issue).
Sheeley, N. R., Jr. and 18 co-authors: 1997, Astrophys. J. 484, 472.
Sime, D. G., Hiei, E., and Hundhausen, A. J.: 1994, in Y. Uchida, T. Watanabe, K. Shibata and H. S. Hudson (eds), X-ray Solar Physics from Yohkoh, Universal Academy Press, New York, p. 197.
Simnett, G. M. and 18 co-authors: 1997, Solar Phys. 175, 685 (this issue).
Steinolfson, R. S.: 1992, J. Geophys. Res. 97, 10811.
Uchida, Y., McAllister, A., Strong, K. T., Ogawara, Y., Shimizu, T., Matsumoto, R., and Hudson, H. S.: 1992, Publ. Astron. Soc. Japan 44, L155.
Wagner, W. J.: 1987, Solar Phys. 114, 81.
Wagner, W. J., Hansen, R. T., and Hansen, S. F.: 1974, Solar Phys. 34, 453.
Wagner, W. J., Illing, R. M. E., Sawyer, C. B., House, L. L., Sheeley, N. R., Jr., Howard, R. A., Koomen, M. J., Michels, D. J., Smartt, R. N., and Dryer, M.: 1983, Solar Phys. 83, 153.
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Plunkett, S.P., Brueckner, G.E., Dere, K.P. et al. The Relationship of Green-Line Transients to White-Light Coronal Mass Ejections. Sol Phys 175, 699–718 (1997). https://doi.org/10.1023/A:1004981125702
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DOI: https://doi.org/10.1023/A:1004981125702