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Recurrent Solar Modulation of the Galactic Cosmic Rays and the Anomalous Nuclear Component in Three Dimensions of the Heliosphere

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Abstract

Ulysses Mission investigations, extending from pole-to-pole of the Sun and inner heliosphere in the period 1993-1996, have led to discoveries that will change dramatically models to account for the physical phenomena underlying the 26-day modulation of galactic cosmic rays and anomalous nuclear components and their propagation modes. These new findings also relate to the propagation of low energy nucleons and electrons accelerated by corotating interaction region shocks. Also included are some unpublished measurements that will need to be taken into account in any model for the 26-day modulation phenomena. This report is a brief summary of the principal results from the solar wind, magnetic field and charged particle investigations, and their alternate interpretations.

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References

  • Balogh, A., et al., 1992, 'The Magnetic Field Investigation on the Ulysses Mission: Instrumentation and Preliminary Scientific Results', Astron. Astrophys. Suppl. Series 92, 221.

    Google Scholar 

  • Bame, S.J. et al., 1992, 'The Ulysses Solar Wind Plasma Experiment', Astron. Astrophys. Suppl. Series 92, 237.

    Google Scholar 

  • Bame, S.J., Goldstein, B.E., Gosling, J.T., Harvey, J.W., McComas, D.J., Neugebauer, M. and Phillip, J.L.: 1993, Geophys. Res. Lett. 20, 2323.

    Google Scholar 

  • Barnes, C.W. and Simpson, J.A.: 1976, 'Evidence for Interplanetary Acceleration of Nucleons in Corotating Interaction Regions, Astrophys. J. 210, L91.

    Google Scholar 

  • Fisk, L.: 1996, 'Motion of the Foot Prints of Heliospheric Magnetic Fields at the Sun: Implications for Recurrent Energetic Particle Events at High Heliographic Latitudes', J. Geophys. Res. 101, 15,547.

    Google Scholar 

  • Fonger, W.H.: 1953, 'Cosmic Radiation Intensity-Time Variations and Their Origin: II, Energy Dependence of 27-Day Variations', Phys. Rev. 91, 351

    Google Scholar 

  • Forsyth, R.J., Balogh, A., Horbury, T.S., Erdös, G., Smith, E.J., and Burton, M.E.: 1996, 'The Heliospheric Magnetic Field at Solar Minimum: Ulysses Observations from Pole to Pole', Astron. Astrophys. 316, 287.

    Google Scholar 

  • Hoeksema, T.: 1996, 'source for Solar Magnetic Field: http://quake.stanford.edu/~wso.

  • Jokipii, J.R. and Kóta, J.: 1995, 'Three-Dimensional Cosmic-Ray Simulations: Heliographic Latitude and Current-Sheet Tilt', Space Sci. Rev. 72, 379.

    Google Scholar 

  • Keppler, E., et al.: 1996, 'The Ulysses Energetic Particle Composition Experiment EPAC', Astron. Astrophys. Suppl. Series 92, 317.

    Google Scholar 

  • Kóta, J. and Jokipii, J.R.: 1995, 'Corotating Variations of Cosmic Rays Near the South Heliospheric Pole', Science 268, 1024.

    Google Scholar 

  • Kunow, H., et al.: 1995, 'High Energy Cosmic Ray Nuclei Results on Ulysses: 2. Effects of a Recurrent High Speed Stream from the Southem Coronal Hole', Astron. Astrophys. Suppl. Series 92, 397

    Google Scholar 

  • Lanzerotti, L.J.: 1992, 'Heliospheric Instrument for Spectra, Composition and Anisotropy at Low Energy', Astron. Astrophys Suppl. Series 92, 49.

    Google Scholar 

  • McKibben, R.B., Simpson, J.A., Zhang, M., Bame, S. and Balogh, A.: 1995, 'Ulysses Out-of-Ecliptic Observations of “27-Day” Variations in High Energy Cosmic Ray Intensity', Space Sci. Rev. 72, 403.

    Google Scholar 

  • Pizzo, V.J.: 1994, 'Global Quasi-Steady Dynamics of the Distant Solar Wind, 1 and 2', J. Geophys. Res. 99, 4173.

    Google Scholar 

  • Quenby, J.J., Witcombe, A., Drolias, B., Frõnz, M. and Keppler, E.: 1996, 'Coronal Diffusion and High Solar Latitude Recurrent Energetic Particle Increases', Astron. Astrophys. 316, 506.

    Google Scholar 

  • Roelof, E.C., Simnett, G.M. and Tappin, S.J.: 1996, 'The Regular Structure of Shock-Accelerated ~ 40-100 keV Electrons in the High Latitude Heliosphere', Astron. Astrophys. 316, 481.

    Google Scholar 

  • Sanderson, T.R., et al.: 1995, 'The Ulysses South Polar Pass: Energetic Ion Observations', Geophys. Res. Lett. 22, 3357.

    Google Scholar 

  • Simpson, J.A. et al.: 1992, 'The Ulysses Cosmic Ray and Solar Particle Investigation', Astron. Astrophys. Suppl. Series 92, 365.

    Google Scholar 

  • Simpson, J.A., et al.: 1995, 'Cosmic Ray and Solar Particle Investigations Over the South Solar Polar Regions of the Sun', Science 268, 1019.

    Google Scholar 

  • Simpson, J.A.: 1997, 'A Brief History of Recurrent Modulation of the Galactic Cosmic Rays: (1937-1990)', Space Sci. Rev., this volume.

  • Smith, E.J. and Marsden, R.G.: 1995, 'Ulysses Observations from Pole-to-Pole: An Introduction', Geophys. Res. Lett. 22, 3297.

    Google Scholar 

  • Smith, E.J. et al.: 1993, 'Disappearance of the Heliospheric Sector Structure at Ulysses', Geophys. Res. Lett. 21, 2327.

    Google Scholar 

  • Zhang, M., Simpson, J.A., McKibben, R.B., Johns, T.S., Smith, E.J. and Phillips. J.L: 1995, 'Ulysses Observations of 26-Day Intensity Variations of Cosmic Rays and Anomalous Helium Over the South Pole', Proc. 24th Int'l. Cosmic Ray Conf. (Rome) 4, 956.

    Google Scholar 

  • Zhang, M.: 1997, 'A Linear Relationship Between the Latitude Gradient and 26-Day Recurrent Variations in the Fluxes of Galactic Cosmic Rays and Anomalous Nuclear Components: I. Observations', Astrophys. J. 488, 841.

    Google Scholar 

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Simpson, J. Recurrent Solar Modulation of the Galactic Cosmic Rays and the Anomalous Nuclear Component in Three Dimensions of the Heliosphere. Space Science Reviews 83, 7–19 (1998). https://doi.org/10.1023/A:1005055505768

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