Abstract
It is shown that the long-duration X-ray events tend to ignore the sunspot cycle. This is particularly true for events with durations of 6 hr or more.
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Acton, L. W., Chubb, T. A., Kreplin, R. W., and Meekins, J. F.: 1963, J. Geophys. Res. 68, 3335.
Cane, H. V.: 1985, J. Geophys. Res. (in press).
Gosling, J. T., Asbridge, J. R., Bame, S. J., Feldman, W. C., and Zwickl, R. D.: 1980, J. Geophys. Res. 85, 3431.
Howard, R. A., Sheeley Jr., N. R., Koomen, M. J., and Michels, D. J.: 1985, J. Geophys. Res. (in press).
Joselyn, J. and Bryson, J. F.: 1980, in M. Dryer and E. Tandberg-Hanssen (eds.), ‘Solar and Interplanetary Dynamics’, IAU Symp. 91, 413.
Kahler, S. W.: 1977, Astrophys. J. 214, 891.
Kahler, S. W., Hildner, E., and Van Hollebeke, M. A. I.: 1978, Solar Phys. 57, 429.
Kahler, S. W., Sheeley, Jr., N. R., Howard, R. A., Koomen, M. J., Michels, D. J., McGuire, R. E., von Rosenvinge, T. T., and Reames, D. V.: 1984, J. Geophys. Res. 89, 9683.
Kahler, S. W., Cliver, E. W., Cane, H. V., McGuire, R. E., Stone, R. E., and Sheeley, Jr., N. R.: 1985, Astrophys. J. (submitted).
Kihldahl, K.: 1984, private communication.
Kreplin, R. W., Chubb, T. A., and Friedman, H.: 1962, J. Geophys. Res. 67, 2231.
Munro, R. H., Gosling, J. T., Hildner, E., MacQueen, R. M., Poland, A. I., and Ross, C. L.: 1979, Solar Phys. 61, 201.
Pallavicini, R., Serio, S., and Vaiana, G. S.: 1977, Astrophys. J. 216, 108.
Sanahuja, B., Domingo, V., Wenzel, K. P., Joselyn, J. A., and Keppler, E.: 1983, Solar Phys. 84, 321.
Schwenn, R., Rosenbauer, H., and Muhlhauser, K. H.: 1980, Geophys. Res. Letters 7, 201.
Sheeley, Jr., N. R., Bohlin, J. D., Brueckner, G. E., Purcell, J. D., Scherrer, V. E., Tousey, R., Smith, Jr., J. B., Speich, D. M., Tandberg-Hanssen, E., Wilson, R. M., DeLoach, A. C., Hoover, R. B., and McGuire, J. P.: 1975, Solar Phys. 45, 377.
Sheeley, Jr., N. R., Howard, R. A., Koomen, M. J., and Michels, D. J.: 1983, Astrophys. J. 272, 349.
Sheeley, Jr., N. R., Howard, R. A., Koomen, M. J., Michels, D. J., Schwenn, R., Muhlhauser, K. H., and Rosenbauer, H.: 1985, J. Geophys. Res. 90, 163.
Smith, H. J. and Smith, E. v. P.: 1963, Solar Flares, MacMillan, New York, p. 71.
Solar-Geophysical Data: 1969–1983, Comprehensive Reports of NRL/SOLRAD and SMS/GOES X-ray flux, NOAA, Boulder, Colo, U.S.A.
Webb, D. F., Krieger, A. S., and Rust, D. M.: 1976, Solar Phys. 48, 159.
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Koomen, M.J., Sheeley, N.R., Howard, R.A. et al. The frequency of long-duration solar X-ray events. Sol Phys 97, 375–379 (1985). https://doi.org/10.1007/BF00165996
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DOI: https://doi.org/10.1007/BF00165996