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The Variable Structure of the X-ray Corona as Viewed by Yohkoh

Published online by Cambridge University Press:  12 April 2016

Kazunari Shibata*
Affiliation:
Solar Physics Division, National Astronomical Observatory, Mitaka, Tokyo 181, Japan

Abstract

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Recent findings on the variable structure of the corona by the soft X-ray telescope on board Yohkoh are reviewed, with emphasis upon the structure and evolution of active regions, and the long term evolution of the global structure of the corona.

Type
Observational Programs for Solar and Stellar Irradiance Variability
Copyright
Copyright © Kluwer 1994

References

Acton, L., Tsuneta, S., Ogawara, Y., Bentley, R., Bruner, M., Canfield, R., Cul-Hane, L., Doschek, G., Hiei, E., Hirayama, T., Hudson, H., KosuGi, T., Lang, J., Lemen, J., Nishimura, J., Makishima, K., Uchida, Y. & Watanabe, T. 1992 The Yohkoh Mission for high-energy solar physics. Science 258, 618625.CrossRefGoogle ScholarPubMed
Antonucci, E. 1994 Variations of coronal radiations in X-ray related to coronal holes, active region loop systems, bright points. In The Sun as a Variable Star: Solar and Stellar Ir-radiance Variations (ed. Pap, J.M., Fröhlich, C., Hudson, H.S. & Solanki, S.J.). Cambridge University Press, in press.Google Scholar
Chou, D.Y. 1993 Structure of emerging flux regions. In The Magnetic and Velocity Fields of Solar Active Regions (ed. Zirin, H., Ai, G. & Wang, H.). Astronomical Society of the Pacifie Conference Series Vol. 46, pp. 471478.Google Scholar
Hanaoka, Y. Kurokawa, H., Enome, S., Nakajima, H., Shibasaki, K., Nishio, M., Takano, T., Torii, C., Sekiguchi, H., Kawashima, S., Bushimata, T., Shinohara, N., Irimajiri, Y., Koshiishi, H., Shiomi, Y., Nakai, Y., Funakoshi, Y., Kitai, R., Ishiura, K. & Kimura, G. 1993 Simultaneous observations of a prominence eruption fol-lowd by a coronal arcade formation in radio, soft X-rays and Ha. Publ. Astron. Soc. Japan, in press.Google Scholar
Hara, H., Tsuneta, S., Lemen, J.R., Acton, L.W. & Mctiernan, J.M. 1992 High-temperature plasmas in active regions observed with the Soft X-ray Telescope aboard Yohkoh. Publ. Astr. Soc. Japan 44, L135L140.Google Scholar
Hara, H. 1993 The X-ray intensity distribution of the corona and its variability associated with solar activity. In New Look at the Sun with Emphasis on Advanced Observations of Coronal Dynamics and Flares - What Do We See with YOHKOH and Nobeyama Radioheliograph -. Univ. Academy Press, in press.Google Scholar
Harvey, K.L. & Martin, S.F. 1973 Ephemeral active regions. Solar Phys. 32, 389402.Google Scholar
Harvey, K.L., Nitta, S., Strong, K.T. & Tsuneta, S. 1993 The relationship of X-ray bright points to the photospheric magnetic fields. In X-ray Solar Physics from Yohkoh (ed. Uchida, Y., Hudson, H., Watanabe, T. & Shibata, K.). Univ. Academy Press, in press.Google Scholar
Hayashi, J. 1992 Rotation of coronal holes. Undergraduate thesis (in Japanese), Dept. Astronomy, Univ. Tokyo.Google Scholar
Hiei, E., Hundhausen, A.J. & Sime, D.G. 1993 Reformation of a coronal helmet streamer by magnetic reconnection after a coronal mass ejection. J. Geophys. Res., in press.Google Scholar
Hudson, H.S. 1991 Solar flares, microflares, nanofiares, and coronal heating. Solar Phys. 133, 357369.Google Scholar
Hudson, H.S. 1994 Spatial resolution of solar total irradiance variability: The Yohkoh white-light observations. In The Sun as a Variable Star: Solar and Stellar Irradiance Variations (ed. Pap, J.M., Fröhlich, C., Hudson, H.S. & Solanki, S.K.). Cambridge University Press, in press.Google Scholar
Hudson, H.S. 1993 The Yohkoh context for high-energy particles in solar flares. In Proc. Watervale Workshop on Solar Flares, in press.Google Scholar
Ishido, Y., Shibata, K., Tanaka, N. & Kurokawa, H. 1992 Observation of EFRs using SXT. In Proc. of “Study of Solar Active Phenomena induced by Magnetic Shear - New Results of Yohkoh Observations -” held in Mitaka, Tokyo, Japan at Feb. 12 – 14; in 1992, pp. 145149.Google Scholar
Kawai, G., Kurokawa, H., Tsuneta, S., Shimizu, T., Shibata, K., Acton, L.W., Strong, K.T. & Nitta, N. 1992 Comparison between Ha and Yohkoh soft X-ray images of emerging flux regions. Publ. Astr. Soc. Japan, 44, L193L198.Google Scholar
Kawai, G. 1993 Emerging flux regions observed in soft X-ray and H-alpha. In New Look at the Sun with Emphasis on Advanced Observations of Coronal Dynamics and Flares - What Do We See with YOHKOH and Nobeyama Radioheliograph -, in press.Google Scholar
Klimchuk, J.A., Acton, L.W., Harvey, K.L., Hudson, H.S., Kluge, K.L., Sime, D.G., Strong, K.T. & Watanabe, Ta. 1993 Coronal eruptions observed by Yohkoh. In X-ray Solar Physics from Yohkoh (ed. Uchida, Y., Hudson, H., Watanabe, T. & Shibata, K.). Univ. Academy Press, in press.Google Scholar
Kozuka, Y., Watanabe, Ta, Kojima, M., Ohyama, M., Tsuneta, S., Saito, T. & Watari, S. 1993 Large scale coronal and solar wind structures. In X-ray Solar Physics from Yohkoh (ed. Uchida, Y., Hudson, H., Watanabe, T. & Shibata, K.). Univ. Academy Press, in press.Google Scholar
Matsumoto, R., Tajima, T., Shibata, K. & Kaisig, M. 1993 Three-dimensional magneto-hydrodynamics of the emerging magnetic flux in the solar atmosphere. Astrophys. J. 414, 357371.Google Scholar
McAllister, A., Uchida, Y., Tsuneta, S., Strong, K.T., Acton, L.W., Hiei, E., Bruner, M.E., Watanabe, Ta. & Shibata, K. 1992 The structure of the coronal soft X-ray source associated with the dark filament disappearance of 1991 September 28 using the Yohkoh Soft X-ray Telescope. Publ. Astr. Soc. Japan 44, L205L210. Google Scholar
Nitta, N., Bastian, T.S., Aschwanden, M.J., Harvey, K.L. & Strong, K.T. 1992 Simultaneous observations of coronal bright points in X-ray and radio wavelengths. Publ. Astr. Soc. Japan 44, L167L172.Google Scholar
Ogawara, Y., Takano, T., Kato, T., Kosugi, T., Tsuneta, S., Watanabe, T., Kondo, I. & Uchida, Y. 1991 The Solar-A Mission: An overview. Solar Phys. 136, 116.Google Scholar
Ogawara, Y., Acton, L.W., Bentley, R.D., Bruner, M.E., Culhane, J.L., Hiei, E., Hirayama, T., Hudson, H.S., Kosugi, T., Lemen, J.R., Strong, K.T., Tsuneta, S., Uchida, Y., Watanabe, T. & Yoshimori, M. 1992 The status of Yohkoh in orbit: An introduction to the initial scientific results. Publ. Astr. Soc. Japan 44, L41L44.Google Scholar
Parker, E.N. 1988 Nanofiares and the solar X-ray corona. Astrophys. J. 330, 474479.CrossRefGoogle Scholar
Rosner, R., Tucker, W.H. & Vaiana, G.S. 1978 Dynamics of the quiescent solar corona. Astrophys. J. 220, 643665.Google Scholar
Saito, T., Ohki, T., Olmsted, C. & Akasofu, S.I. 1989 A representation of the magnetic neutral line on the solar source surface in terms of the Sun’s axial dipole at the center and two equatorial dipoles in the photosphere. J. Geophys. Res. 94, 1499314999.Google Scholar
Saito, T., Minami, S., Kozuka, Y., Takahashi, T., Hudson, H., Tsuneta, S. & Watan-Abe, T. 1993 Large-scale structure of the solar plasma corona - An analysis of it Yohkoh SXT images -. In Proc. of the Fourth International Conference on Plasma Physics and Controlled Nuclear Fusion (ESA SP-351). pp. 215218.Google Scholar
Shimizu, T., Tsuneta, S., Acton, L.W., Lemen, J.R. & Uchida, Y. 1992 Transient brightenings in active regions observed by the Soft X-ray Telescope on Yohkoh. Publ. Astr. Soc. Japan 44, L147L153.Google Scholar
Shibata, K., Tajima, T., Steinolfson, R. & Matsumoto, R. 1989 Two-dimensional mag-netohydrodynamic model of emerging magnetic flux in the solar atmosphere. Astrophys. J. 345, 584596.CrossRefGoogle Scholar
Shibata, K. 1991 Theoretical models of solar flares. In Flare Physics in Solar Activity Maximum 22 (ed. Uchida, Y., Canfield, R., Watanabe, T. & Hiei, E.). Lecture Note in Physics No. 387, Springer Verlag, pp. 205218.Google Scholar
Shibata, K., Nozawa, S. & Matsumoto, R. 1992a Magnetic reconnection associated with emerging magnetic flux. Publ. Astr. Soc. Japan 44, 265272.Google Scholar
Shibata, K., Ishido, Y., Acton, L.W., Strong, K.T., Hirayama, T., Uchida, Y., Mcallister, A.H., Matsumoto, R., Tsuneta, S., Shimizu, T., Hara, H., Sakurai, T., Ichimoto, K., Nishino, Y. & Ogawara, Y. 1992b Observation of X-ray jets with the Yohkoh Soft X-ray Telescope. Publ. Astr. Soc. Japan 44, L173L179.Google Scholar
Shibata, K., Nitta, N., Matsumoto, R., Tajima, T., Yokoyama, T., Hirayama, T. & Hudson, H. 1993a Two types of interaction between emerging flux and coronal magnetic field. In X-ray Solar Physics from Yohkoh (ed. Uchida, Y., Hudson, H., Watanabe, T. & Shibata, K.). Univ. Academy Press, in press.Google Scholar
Shibata, K., Nitta, N., Strong, K.T., Matsumoto, R., Yokoyama, T., Hirayama, T., Hudson, H. & Ogawara, Y. 1993b A gigantic coronal jet ejected from a compact active region in a coronal hole. Nature, submitted.Google Scholar
Shibata, K., Nitta, N. & Hara, H. 1993c Characteristics of active regions appearing in coronal holes, to be submitted.Google Scholar
Slater, G. & Lemen, J. 1993, private communication.Google Scholar
Strong, K.T. &, Harvey, K.L., Hirayama, T., Nitta, N., Shimizu, T. & Tsuneta, S. 1992 Observations of the variability of coronal bright points by the Soft X-ray telescope on Yohkoh. Publ. Astr. Soc. Japan 44, L161L166.Google Scholar
Sturrock, P.A., Kaufman, P., Moore, R.L. & Smith, D.F. 1984 Energy release in solar flares. Astrophys. J. 94, 341357.Google Scholar
Sturrock, P.A. 1992 Emerging picture of eruptive solar flares. In Proc. IAU Colloq. No. 133, “Eruptive Solar Flares” (ed. Svestka, Z., Jackson, B.L. & Machado, M.E.). Spring-Verlag, pp. 397409.Google Scholar
Su, Q., Hirayama, T., Shibata, K., Ichimoto, K., Tsuneta, S., Hara, T., Acton, L. & Lemen, J. 1993 Soft X-ray loops at the beginning of a rapidly growing sunspot group, in preparation.Google Scholar
Svestka, Z. & Howard, R. 1979 Interconnecting loops: morphology of the sudden brightenings. Solar Phys. 63, 297318.Google Scholar
Takahashi, T. 1993 Long-term variation of large scale solar X-ray structures with the Soft X-ray Telescope aboard Yohkoh satellite. Master thesis (in Japanese), Dept. of Astronomy, Univ. of Tokyo.Google Scholar
Timothy, A.F., Krieger, A.S. & Vaiana, G.S. 1975 The structure and evolution of coronal holes. Solar Phys. 42, 135156.CrossRefGoogle Scholar
Tsuneta, S., Acton, L.W., Bruner, M., Lemen, J., Brown, W., Caravalho, R., Catura, R., Freeland, S., Jurcevich, B., Morrison, M., Ogawara, Y., Hirayama, T. & Owens, J. 1991 The Soft X-ray Telescope for the Solar A Mission. Solar Phys. 136, 3767.Google Scholar
Tsuneta, S., Takahashi, T., Acton, L.W., Bruner, M.E., Harvey, K.L. & Ogawara, Y. 1992 Global restructuring of the coronal magnetic fields observed with the Yohkoh Soft X-ray Telescope. Publ. Astr. Soc. Japan 44, L211L214.Google Scholar
Tsuneta, S., Hara, H., Shimizu, T., Acton, L.W., Strong, K.T., Hudson, H. & Ogawara, Y. 1992 Observation of solar flare at the limb with the Yohkoh Soft X-ray Telescope. Publ. Astr. Soc. Japan 44, L63L69.Google Scholar
Tsuneta, S. & Lemen, J.R. 1993 Dynamics of the solar corona observed with the Yohkoh Soft X-ray Telescope. In Proc. “Advances in Stellar and Solar Coronal Physics” (ed. Linsky, J. & Serio, S.). Kluwer, in press.Google Scholar
Tsuneta, S. 1993 Highlights of Yohkoh results. In Proc. of the Fourth International Conference on Plasma Physics and Controlled Nuclear Fusion (ESA SP-351). pp. 7583.Google Scholar
Uchida, Y., McAllister, A., Strong, K.T., Ogawara, Y., Shimizu, T., Matsumoto, R. & Hudson, H. 1992 Continual expansion of the active-region corona observed by the Soft X-ray Telescope on Yohkoh. Publ. Astr. Soc. Japan 44, L155L160.Google Scholar
Uchida, Y. 1993 Some initial results from the Yohkoh observations of solar high-temperature and high-energy phenomena. In Proc. of COSPAR Symp., in press.Google Scholar
Watanabe, Ta., Kozuka, Y., Ohyama, M., Kojima, M., Yamaguchi, K., Watari, S., Tsuneta, S., Joselyn, J.A., Harvey, K.L., Acton, L.W. & Klimchuk, J.A. 1992 Coronal/interplanetary disturbances associated with disappearing solar filaments. Publ. Astr. Soc. Japan 44, L199L204.Google Scholar
Webb, D.F. 1981 Active region structures in the transition region and corona. In Proc. Skylab Workshop “Solar Active Region” (ed. Orrall, F.Q.). U. Colorado Press, pp. 165198.Google Scholar
Yokoyama, T. & Shibata, K. 1993 Numerical simulation of magnetic reconnection associated with emerging flux in the solar atmosphere. In Proc. of the Fourth International Conference on Plasma Physics and Controlled Nuclear Fusion (ESA SP-351). pp. 203206.Google Scholar
Zwaan, C. 1987 Elements and patterns in the solar magnetic field. Ann. Rev. Astr. Ap. 25, 83111.CrossRefGoogle Scholar