Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
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STUDY OF FLARE-ASSOCIATED X-RAY PLASMA EJECTIONS : II. MORPHOLOGICAL CLASSIFICATION

  • KIM YEON-HAN (Korea Astronomy Observatory) ;
  • MOON Y.-J. (Korea Astronomy Observatory) ;
  • CHO K.-S. (Korea Astronomy Observatory) ;
  • BONG SU-CHAN (Korea Astronomy Observatory) ;
  • PARK Y.-D. (Korea Astronomy Observatory, Big Bear Solar Observatory, NJIT)
  • Published : 2004.12.01
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Abstract

X-ray plasma ejections often occurred around the impulsive phases of solar flares and have been well observed by the SXT aboard Yohkoh. Though the X-ray plasma ejections show various morphological shapes, there has been no attempt at classifying the morphological groups for a large sample of the X-ray plasma ejections. In this study, we have classified 137 X-ray plasma ejections according to their shape for the first time. Our classification criteria are as follows: (1) a loop type shows ejecting plasma with the shape of loops, (2) a spray type has a continuous stream of plasma without showing any typical shape, (3) a jet type shows collimated motions of plasma, (4) a confined ejection shows limited motions of plasma near a flaring site. As a result, we classified the flare-associated X-ray plasma ejections into five groups as follows: loop-type (60 events), spray-type (40 events), jet-type (11 events), confined ejection (18 events), and others (8 events). As an illustration, we presented time sequence images of several typical events to discuss their morphological characteristics, speed, CME association, and magnetic field configuration. We found that the jet-type events tend to have higher speeds and better association with CMEs than those of the loop-type events. It is also found that the CME association (11/11) of the jet-type events is much higher than that (5/18) of the confined ejections. These facts imply that the physical characteristics of the X-ray plasma ejections are closely associated with magnetic field configurations near the reconnection regions.

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References

  1. Hanaoka, Y. 2000, Radio and X-ray Observations of Double Loop Flares, Adv. Space Res., 26(3), 453 https://doi.org/10.1016/S0273-1177(99)01105-9
  2. Kim, Y.-H., Moon, Y.-J., Cho, K. -S., & Park, Y. D. 2004, Study of Flare-Associated X-ray Plasma Ejections: I Their Associations with CMEs, ApJ, in press (Paper I)
  3. Nitta, N. 1996, A Study of Major Flares Observed by Yohkoh, in ASP conf. ser. 111, Magnetic Reconnection in the Solar Atmosphere, ed. Bentley, R. D. & Mariska, J. T. (San Francisco: ASP), 156
  4. Ohyama, M. & Shibata, K. 1996, X-ray Plasma Ejections in an Eruptive Flare, in Magnetodynamic Phenomena in the Solar Atmosphere, ed. Y. Uchida, T. Kosugi, & H. S. Hudson (Dordrecht: Kluwer), 525
  5. Ohyama, M, & Shibata, K. 1997, Preflare Heating and Mass Motion in a Solar Flare Associated with Hot Plasma Ejection: 1993 November 11 C9.7 Flare, PASJ, 49, 249
  6. Ohyama, M, & Shibata, K. 1998, X-ray Plasma Ejection Associated with an Impulsive Flare on 1992 October 5: Physical Conditions ofX-ray Plasma Ejection, ApJ, 499, 934 https://doi.org/10.1086/305652
  7. Ohyama, M., Shibata, K., Yokoyama, T., & Shimojo, M. 1997, X-ray Plasma Ejections and Jets from Solar Com-pact Flares Observed with the YOHKOH Soft X-ray Telescope, Adv. Space Res., 19, 1849 https://doi.org/10.1016/S0273-1177(97)00086-0
  8. Shibata, K., Masuda, S., Shimojo, M., Hara, H., Yokoyama, T., Tsuneta, S., Kosugi, T., & Ogawara, Y. 1995, Hot-Plasma Ejections Associated with Compact-Loop Solar Flares, ApJ, 451, L83
  9. Svestka, Z., Farnik, F, Hudson, H., Uchida, Y., Hick, P., & Lemel, J. R. 1995, Large-Scale Active Coronal Phenomena in Yohkoh SXT Images: I. Post-Flare Giant Arches Rising with Constant Speed, Sol. Phys., 161, 331
  10. Tsuneta, S. 1997, Moving Plasmoid and Formation of the Neutral Sheet in a Solar Flare, ApJ, 483, 507 https://doi.org/10.1086/304236
  11. Tsuneta, S., Acton, L., Bruner, M., Lemen, J., Brown, W., Caravalho, R., Catura, R., Freeland, S., Jurcevich, B., & Owens, J. 1991, The Soft X-ray Telescope for the SOLAR-A Mission, Sol. Phys., 136, 37 https://doi.org/10.1007/BF00151694

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