Abstract
Interplanetary coronal mass ejections (ICMEs), the interplanetary counterpart of coronal mass ejections (CMEs), are most commonly identified by their enhanced magnetic field strengths and rotating magnetic field orientation. However, there are other frequent signatures in the plasma. We use a pair of these signatures, a linearly decreasing plasma bulk velocity and a cool (< 20 km s−1) ion thermal speed, to identify candidate ICMEs. Many ICMEs, identified through their magnetic signatures, are also found by their ion signatures alone. However, many are not. These missed ICMEs appear not to be expanding, even when they are accompanied by leading shocks. The ICMEs with both the magnetic and ion signatures appear to be expanding as judged from either set of observations. The most clearly defined ICMEs have transit times from the Sun and growth times to the observed size that are equal. These ropes fit the paradigm of compact magnetic structures arising low in the corona and expanding uniformly in time, as they travel at constant center of mass speed toward 1 AU.
Similar content being viewed by others
References
Burlaga, L. F.: 1991, in R. Schwenn and E. Marsch (eds.), Magnetic Clouds, Physics of the Inner Heliosphere II, Springer-Verlag, Berlin, pp. 1-22
Gosling, J. T.: 1990, in C. T. Russell et al. (eds.), 'Coronal Mass Ejections and Magnetic Flux Ropes in Interplanetary Space', Physics of Magnetic Flux Ropes, AGU, Washington, DC, pp. 343-364.
Gosling, J. T., Pizzo, V., and Bame, S. J.: 1973, J. Geophys. Res., 78, 2001.
Gosling, J. T., Baker, D. N., Bame, S. J., Feldman, W. C., and Zwickl, R. D.: 1987, J. Geophys. Res. 92, 8519.
Hundhausen, A. J.: 1988, in V. Pizzo, T. E. Holzer, and D. G. Scime (eds.), 'The Origin and Propagation of Coronal Mass Ejections', Proceedings of the Sixth International Solar Wind Conference, NCAR/TN-306+Proc., Boulder, Colorado, pp.181-214.
Kahler, S.: 1987, Rev. Geophys. 25, 663.
Lepping, R. P., Acuña, M. H., Burlaga, L. F., Farrell, W. M., Slavin, J. A., Schatten, K. H., Mariani, F., Ness, N. F., Neubauer, F. M., Whang, Y. C., Byrnes, J. B., Kennon, R. S., Panetta, P. V., Scheifele, J. S., and Warley, E. M.: 1995, Space Sci. Rev. 71, 207.
Montgomery, M. D., Asbridge, J. R., Bame, S. J., and Feldman, W. C.: 1974, J. Geophys. Res., 79, 3103.
Ogilvie, K. W., Chornay, D. J., Fritzenreiter, R. J., Hunsaker, F., Keller, J., Lobbell, J., Miller, G., Scudder, J. D., Sittler, J. E. C., Torbert, R. B., Bodet, O., Needell, G., Lazarus, A. J., Steinberg, J. T., Tappan, J. H., Mavretic, A., and Gergin, E.: 1995, in C. T. Russell (ed.), 'SWE, A Comprehensive Plasma Instrument for the WIND Spacecraft', The Global Geospace Mission, Kluwer Academic Publishers, Dordrecht, Holland, pp. 55-77.
Richardson, I. G. and Cane, H. V.: 1995, J. Geophys. Res. 100, 23 397.
Richardson, I. G., Farrugia, C. J., and Cane, H. V.: 1997, J. Geophys. Res. 102, 4691.
Riley, P., Gosling J. T., and Pizzo, V. J.: 2001, J. Geophys. Res., 106, 8291.
Riley, P., Gosling, J. T., McComas, D. J., and Forsyth, R. J.: 2000, J. Geophys. Res. 105, 12 617.
Wang, Y. M. and Sheeley, J. N. R.: 1990, Astrophys. J. 355, 726.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Russell, C., Shinde, A. ICME Identification from Solar Wind Ion Measurements. Sol Phys 216, 285–294 (2003). https://doi.org/10.1023/A:1026108101883
Issue Date:
DOI: https://doi.org/10.1023/A:1026108101883