Abstract
Two distinct regions of shock-associated magnetic clouds, (i) magnetically turbulent regions formed due to interaction between magnetic cloud and ambient magnetic field i.e. turbulent interaction region (TIR), and magnetically quiet region called magnetic cloud have been considered separately and correlation of interplanetary plasma and field parameters, magnetic field strength (B) and solar wind speed (V), with cosmic ray intensity (I) have been studied during the passage of these two regions. A good correlation between B and I and between V and I has been obtained during the passage of sheath when the magnetic field is high and turbulent, while these correlation have been found to be poor during the passage of magnetic clouds when the field is strong and smooth. Further, there is a positive correlation between enhancement in field strength and its variance in the sheath region. These results strongly support the hypothesis that most Forbush decreases are due to scattering of particles by region of enhanced magnetic turbulence. These results also suggest that it will provide a better insight if not the magnetic field enhancement alone but in addition, the nature of magnetic field enhancement is also considered while correlating the field enhancements with depressions in cosmic rays.
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References
Ananth, A.G. and Venkatesan, D.: 1993, Solar Phys. 143, 273.
Badruddin: 1990, in: S. Gredzielski and D.E. Page (eds.), Physics of the Outer Heliosphere, Pergamon Press, Oxford, p. 183.
Badruddin: 1993, Proc. 23 rd Int. Cosmic Ray Conf. 3, 727.
Badruddin: 1997, Astrophys. Space Sci. 246, 171.
Badruddin: 1998, Planet. Space Sci. 46, 1015.
Badruddin: 2000, Nuovo Cim. C 23, 217.
Badruddin, Yadav, R.S. and Yadav, N.R.: 1986, Solar Phys. 105, 413.
Badruddin, Venkatesan, D. and Zhu, B.Y.: 1991, Solar Phys. 134, 203.
Barnes, A.: 1979, in: E.N. Parker, C.F. Kennel and L.J. Lanzerotti (eds.), Solar System Plasma Physics, North-Holland, 1, 251.
Barouch, E. and Burlaga, L.F.: 1975, J. Geophys. Res. 80, 449.
Bavassano, B., Iucci, N., Lepping, R.P., Signorini, C., Smith, E.J. and Villoresi, G.: 1994, J. Geophys. Res. 99, 4227.
Belcher, J.W. and Davis, L., Jr.: 1971, J. Geophys. Res. 76, 3534.
Burlaga, L.F., Sittler, E., Mariani, F. and Schwenn, R.: 1981, J. Geophys. Res. 86, 6673.
Burlaga, L.F., McDonald, F.B., Goldstein, M.L. and Lazarus, A.J.: 1985, J. Geophys. Res. 90, 12017.
Cane, H.V.: 1993, J. Geophys. Res. 98, 3509.
Cane, H.V., Richardson, I.G. and Von Rosenvinge, T.T.: 1996, J. Geophys. Res. 101, 21561.
Chih, P.P. and Lee, M.A.: 1986, J. Geophys. Res. 91, 2903.
Duggal, S.P., Pomerantz, M.A., Schaefer, R.K. and Tsao, C.H.: 1983, J. Geophys. Res. 88, 2973.
Iucci, N., Parisi, M., Storini, M. and Villoresi, G.: 1979, Nuovo Cim. C 2, 421.
Klein, L.W. and Burlaga, L.F.: 1982, J. Geophys. Res. 87, 613.
Kota, J. and Jokipii, J.R.: 1991, Geophys. Res. Lett. 18, 1797.
Lepping, R.P., Burlaga, L.F., Tsurutani, B.T., Ogilvie, L.V., Lazarus, A.J., Evans, D.S. and Klein, L.W.: 1991, J. Geophys. Res. 96, 4925.
LeRoux, J.A. and Potgieter, M.S.: 1989, Adv. Space Res. 9, 225.
LeRoux, J.A. and Potgieter, M.S.: 1991, Astron. Astrophys. 243, 531.
Lockwood, J.A., Webber, W.R. and Debrunner, H.: 1991, J. Geophys. Res. 96, 11587.
Munakata, K. and Nagashima, K.: 1979, Proc. 16 th Int. Cosmic Ray Conf. 3, 530.
Nishida, A.: 1982, J. Geophys. Res. 87, 6649.
Perko, J.S. and Burlaga, L.F.: 1992, J. Geophys. Res. 97, 4305.
Perko, J.S. and Burlaga, L.F.: 1993, J. Geophys. Res. 98, 6649.
Sanderson, T.R., Beek, J., Marsden, R.G., Tranquille, C., Wenzel, K.-P., McKibben, R. and Smith, E.J.: 1991, Proc. 21 st Int. Cosmic Ray Conf. 6, 255.
Venkatesan, D. and Badruddin: 1990, Space Sci. Rev. 52, 121.
Venkatesan, D., Shukla, A.K. and Agrawal, S.P.: 1982, Solar Phys. 81, 375.
Wada, M. and Suda, T.: 1981, Sci. rep. Inst. Phys. Chem. Res. Jpn. 74, 1.
Zhang, G. and Burlaga, L.F.: 1988, J. Geophys. Res. 93, 2511.
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Badruddin Transient Modulation of Cosmic Ray Intensity: Role of Magnetic Clouds and Turbulent Interaction Regions. Astrophysics and Space Science 281, 651–661 (2002). https://doi.org/10.1023/A:1015870315401
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DOI: https://doi.org/10.1023/A:1015870315401