Abstract
A recurrent Hα surge was observed on 7 October, 1991 on the western solar limb with the Meudon MSDP spectrograph. The GOES satellite recorded X-ray subflares coincident with all three events. During two of the surges high-resolutionYohkoh Soft X-ray Telescope (SXT) images have been taken. Low X-ray loops overlying the active region where the surges occurred were continuously restructuring. A flare loop appeared at the onset of each surge event and somewhat separated from the footpoint of the surge. The loops are interpreted as causally related to the surges. It is suggested that surges are due to magnetic reconnection between a twisted cool loop and open field lines. Cold plasma bubbles or jets squeezed among untwisting magnetic field lines could correspond to the surge material. No detection was made of either X-ray emission along the path of the surges or X-ray jets, possibly because of the finite detection threshold of theYohkoh SXT.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Chiuderi-Drago, F., Mein, N., and Pick, M.: 1986,Solar Phys. 97, 389.
Gu, X. M., Lin, J., Li, K. J., Xuan, J. Y., Luan, T., and Li, Z. K.: 1994,Astron. Astrophys. 282, 240.
Hara, H., Tsuneta, S., Lemen, J. R., Acton, L. W., and McKiernan, J. M.: 1992,Publ. Astron. Soc. Japan,44, L135.
Harrison, R.A., Rompolt, B., and Garczynska, I.: 1988,Solar Phys. 116, 61.
Heyvaerts, J., Priest, E. R., and Rust, D. M.: 1977,Astrophys. J. 216, 123.
Heristchi, D. and Mouradian, Z.: 1992,Solar Phys. 142, 21.
Hollweg, J., Jackson, S., and Galloway, D.: 1982,Solar Phys. 75, 35.
Kurokawa, H.: 1988,Vistas Astron.,31, 67.
Kurokawa, H. and Kawai, G.: 1993,The Magnetic and Velocity Fields of Solar Active Regions, Astronomical Society of the Pacific Conference Series,46, 507.
Mein, P.: 1977,Solar Phys. 54, 45.
Mouradian, Z., Martres, M. J., and Soru-Escaut, I.: 1983,Solar Phys. 87, 309.
Raadu, M.A., Malherbe, J. M., Schmieder, B., and Mein, P.: 1987,Solar Phys. 109, 59.
Rust, D. M., Webb, D. F., and MacCombie, W: 1977,Solar Phys. 54, 53.
Sakurai, T. and Koyano, H.: 1992,Solar Vector Magnetograms 1991, Okayama Astrophys. Obs., National Astron. Obs., Japan.
Schadee, A. and Martin, S. F.: 1986, in D. F. Neidig (ed.),The Lower Atmosphere of Solar Flares, NSO Publication, 360.
Schmieder, B., Vial, J. C., Mein, P., and Tandberg-Hanssen, E.: 1983,Astron. Astrophys. 127, 337.
Schmieder, B., Malherbe, J. M., Mein, P., and Tandberg-Hanssen, E.: 1984,Solar Phys. 94, 133.
Schmieder, B., Simnett, G. M., Mein, P., and Tandberg-Hanssen, E.: 1988,Astron. Astrophys. 201, 327.
Schmieder, B., van Driel-Gesztelyi, L., Gerlei, O., and Simnett, G. M.: 1993,Solar Phys. 146, 163.
Schmieder, B., Golub, L., and Antiochos, S. K.: 1994,Astrophys. J. 425, 326.
Shibata, K. and Uchida, Y.: 1986,Solar Phys. 103, 299.
Shibata, K., Nozawa, S., and Matsumoto, R.: 1992,Publ. Astron. Soc. Japan,44, 265.
Shibata, K., Yokoyama, T., and Shimojo, M.: 1994, in S. Enome and T. Hirayama (eds.),Kofu Meeting Proceedings, Nobeyama Radio Observatory Report No. 360, p. 75.
Shibata, K., Nishikawa, T., Kitai, R., and Suematsu, Y.: 1982,Solar Phys. 77, 121.
Shibata, K., Ishido, Y., Acton, L. W.et al.: 1992,Publ. Astron. Soc. Japan,44, L173.
Steinolfson, R. S., Schmahl, E. J., and Wu, S. T.: 1979,Solar Phys. 63, 187.
Sterling, A. C., Mariska, J. T., Shibata, K., and Suematsu, Y.: 1991,Astrophys. J. 381, 313.
Sterling, A. C., Shibata, K., and Mariska, J. T.: 1993,Astrophys. J. 407, 778.
Švestka, Z., Fárník, F., and Tang, F.: 1990,Solar Phys. 127, 149.
Tsuneta, S., Acton, L. W.et al.: 1991,Solar Phys. 136, 37.
Yokoyama, T. and Shibata, K.: 1993, ESA SP351, 203.
Yokoyama, T. and Shibata, K.: 1994, in S. Enome and T. Hirayama (eds.),Kofu Meeting Proceedings, Nobeyama Radio Observatory Report No. 360, p. 367.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Schmieder, B., Shibata, K., Van Driel-Gesztelyi, L. et al. Hα surges and associated Soft X-ray loops. Sol Phys 156, 245–264 (1995). https://doi.org/10.1007/BF00670226
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00670226