Abstract
Several features of the August 1972 events are studied using neutron monitor data together with solar wind streamlines calculated on the basis of an approximate kinematic approach. Examination of the evolution of these streamlines shows that the streamline which passes from the Earth undergoes dramatic changes during the main phase of these events. In a few hours this streamline, which was estimated with HEOS-2 solar wind velocity data, was decreased (i.e., compressed) to a total radial extend of 0.2 AU (at the beginning of 5 August), although its initial length was 1 AU. An exact MHD time-dependent solution by Dryer et al. (1978a) gives similar results.
The relative cosmic ray increase (3–7 UT, 5 August), immediately after the deep F.d., is attributed to trapping and acceleration of particles between two shock waves. Similar acceleration was found by Pomerantz and Duggal (1974) and Levy et al. (1976) for another cosmic ray increase during this event.
The extremely large solar wind velocities during the main phase of the event are not only due to the large energy of the flare but also to the fact that the ambient solar wind was already almost empty because of the sweeping action of previous shock waves.
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Agrawal, S. P., Ananth, A. G., Bemalkhedkar, M. N., Kargathra, L. V., and Rao, U. R.: 1974, J. Geophys. Res. 72, 2269.
Apostolakis, A., Mavromichalaki, H., and Moussas, X.: 1973, in H. E. Coffey (ed.), Collected Data Reports on August 1972 Solar Terrestrial Events, Report UAG 28, World Data Center A, p. 454.
Barnes, C. W. and Simpson, J. A.: 1976, Astrophys. J. 210, L91.
Bertsch, D. L., Biswas, S., and Reames D. V.: 1974, Solar Phys. 39, 479.
Cattaneo, M. B., Cerulli-Irelli, P., Diodato L., Egidi A., Moreno G., and Hedgecock, P. C.: 1974, in D. E. Page (ed.), Correlated Interplanetary and Magnetospheric Observations, D. Reidel Publ. Co., Dordrecht, Holland, p. 555.
Dryer, M.: 1974, Space Sci. Rev. 15, 403.
Dryer, M.: 1975, Space Sci. Rev. 17, 277.
Dryer, M., Eviatar, A., Frohlich, A., Jacobs, A., and Joseph, J. H.: 1975, J. Geophys. Res. 80, 2001.
Dryer, M., Smith, Z. K., Steinolfson, R. S., Mihalov, J. D., Wolfe, J. H., and Chao, J.-K.: 1976, J. Geophys. Res. 81, 4651.
Dryer, M., Candelaria, C., Smith, Z. K., Steinolfson, R. S., Smith, E. J., Wolfe, J. H., Mihalov, J. D., and Rosenau, P.: 1978a, J. Geophys. Res. 83, 532.
Dryer, M., Shea, M. A., Smart, D. F., Collard, H. R., Mihalov, J. D., Wolfe, J. H., and Warwick, J. W.: 1978b, J. Geophys. Res. 83, 1165.
ESRO: 1972, General Report, p. 39.
Golsing, J. T., Hundhausen, A. J., and Bame, S. J.: 1976, J. Geophys. Res. 81, 2111.
Hundhausen, A. J. and Gentry, R. A.: 1969, J. Geophys. Res. 74, 2908.
Hundhausen, A. J. and Golsing, J. T.: 1976, J. Geophys. Res. 81, 1436.
Intriligator, S. D.: 1977, J. Geophys. Res. 82, 603.
Kremser, G., Pfotzer, G., Kirsch, E., Spect, H., Riedlev, N., and Zirm, K.: 1974, in D. E. Page (ed.), Correlated Interplanetary and Magnetospheric Observations, D. Reidel Publ. Co., Dordrecht, Holland, p. 603.
Lanzerotti, L. J. and Maclennan, C. G.: 1974, in D. E. Page (ed.), Correlated Interplanetary and Magnetospheric Observations, D. Reidel Publ. Co., Dordrecht, Holland, p. 587.
Levy, E. H., Duggal, S.P., and Pomerantz, M.A.: 1976, J. Geophys. Res. 81, 51.
Lincoln, J. V. and Leighton, R. B.: 1972, Preliminary Compilation of Data for Retrospective World Interval July 26–August 14, 1972, Report UAG 21, World Data Center A for Solar Terrestrial Physics.
Lockwood, J. A.: 1971, Space Sci. Rev. 12, 658.
McDonald, F. B., Teegarden, B. J., Trainor, J. H., and von Rodenvinge, T. T.: 1976, Astrophys. J. 203, L149.
Mihalov, J. D., Colburn, D. S., Colland, H. R., Smith, B. F., Sonnet, C. P., and Wolfe, J. H.: 1974, in D. E. Page (ed.), Correlated Interplanetary and Magnetospheric Observations, D. Reidel Publ. Co., Dordrecht, Holland, p. 545.
Moussas, X. and Quenby, J. J.: 1980, under preparation.
Otaola, J., Gall, R., and Perez-Enriquez, R.: 1977a, 15th Intern. Cosmic Rays Conf., (Plovdiv) 3, 25.
Otaola, J., Gall, R., and Perez-Enriquez, R.: 1977b, STIP/1977, in M. A. Shea, D. F. Smart, and S. T. Wu (eds.), AFGL-TR-77-0309, Hanscom, Mass., p. 253.
Pomerantz, M. A. and Duggal, S. P.: 1974, J. Geophys. Res. 79, 913.
Smith, E. J.: 1976, Space Sci. Rev. 19, 661.
Smith, E. J. and Wolfe, J. H.: 1977, in M. A. Shea, D. F. Smart, and S. T. Wu (eds.), Study of Travelling Interplanetary Phenomena, D. Reidel Publ. Co., Dordrecht, Holland, p. 227.
Smith, E. J., Leverett, D. Jr., Coleman, P. J. Jr., Colburn, D. S., Dyal, P., and Jones, D. E.: 1977, J. Geophys. Res. 82, 1077.
Steinolfson, R. S., Dryer, M., and Nakagawa, Y.: 1975a, J. Geophys. Res. 80, 1223.
Steinolfson, R. S., Dryer, M., and Nakagawa, Y.: 1975b, J. Geophys. Res. 80, 1989.
Tverskoy, B. A.: 1967, Zh. Eksp. Teor. Fiz. 52, 483 (1968, Soviet Phys. JETP 25, 317).
Van Hollebeke, M. A. I., McDonald, F. B., Trainor, J. H., and von Rosenvinge, T. T.: 1977, NASA Technical Memorandum 78040.
Venkatesan, D., Mathews, T., Lanzerotti, L. J., Fairfield, D. H., and Bostrom, C. O.: 1975, J. Geophys. Res. 80, 1715.
Vernov, S. N., Chudakov, A. E., Vakulov, P. V., Gorchakov, E. V., Kontor, N. N., Logachev, Yu. I., Lyubimov, G. P., Pereslegina, N. V., and Timofeev, G. A.: 1970a, Acta Phys. Acad. Sci. Hungaricae 29, Supl. 459.
Vernov, S. N., Chudakov, A. E., Vakulov, P. V., Gorchakov, E. V., Kontor, N. N., Logachev, Yu. I., Lyubimov, G. P., Pereslegina, N. V., and Timofeev, G. A.: 1970b, in V. Manno and D. E. Page (eds.), Intercorrelated Satellite Observations Related to Solar Events, D. Reidel Publ. Co., Dordrecht, Holland, p. 53.
Wu, S. T., Dryer, M., and Han, S. M.: 1976, Solar Phys. 49, 187.
Yeroshenko, Ye. G. and Ivanov, K. G.: 1977, Geomagn. Aeron. 16, 488.
Zastenker, G. N., Vaisberg, O. L., Cambou, F., Temny, V. V., and Khokhlov, N. Z.: 1975, Report D-188, Academy of Sciences, USSR, Space Research Institute, Moscow.
Zastenker, G. N., Temny, V. V., and d'Uston, C.: 1976, Report PR-294, Academy of Sciences USSR, Space Research Institute, Moscow.
Zastenker, G. N., Temny, V. V., d'Uston, C., and Bosqued, J. M.: 1978, J. Geophys. Res. 83, 1035.
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Work performed partly at the University of Athens and partly at Imperial College of Science and Technology.
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Moussas, X. Particle trapping and acceleration during the August 1972 event. Sol Phys 67, 163–180 (1980). https://doi.org/10.1007/BF00146691
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DOI: https://doi.org/10.1007/BF00146691