Differences in the spectra of anomalous cosmic ray helium nuclei in two solar magnetic polarity cycles

Journal of Geophysical Research: Space Physics

Volumn 110, Issue A7, 2005, Pages

  Webber, W R ^a   Cummings, A C ^b   Stone, E C ^b   McDonald, F B ^c   Lal, N ^d   Heikkila, B ^d  

^a NEW MEXICO STATE UNIVERSITY   (United States)

^b CALIFORNIA INSTITUTE OF TECHNOLOGY   (United States)

^c University of Maryland   (United States)

^d NASA GODDARD SPACE FLIGHT CENTER   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 33746368670     PISSN: None     EISSN: 21699402     Source Type: Journal    
DOI: 10.1029/2005JA011123     Document Type: Article

References (27)

1. Caballero-Lopez, R. A., and H. Moraal (2004), Limitations of the force field equation to describe cosmic ray modulation, J. Geophys. Res., 109, A01101,doi:10.1029/2003JA010098.
2. Christian, E. R., A. C. Cummings, and E. C. Stone (1988), Evidence for anomalous cosmic ray hydrogen, Astrophys. J., 334, L77-L80.
3. Christian, E. R., A. C. Cummings, and E. C. Stone (1995), Observations of anomalous cosmic-ray hydrogen from the Voyager spacecraft, Astrophys. J., 446, L105-L108.
4. Cummings, A. C., and E. C. Stone (1995), Elemental composition of the anomalous cosmic ray component, Proc. Int. Conf. Cosmic Rays 24th, 4, 497-500.
5. Cummings, A. C., and E. C. Stone (2001), Onset of solar modulation in the outer heliosphere as seen in anomalous cosmic rays, Proc. Int. Conf. Cosmic Rays 27th, 1, 4251-4254.
6. Cummings, A. C., E. C. Stone, and W. R. Webber (1984), Evidence that the anomalous cosmic ray component is singly ionized, Astrophys. J., 287, L99-L102.
7. Cummings, A. C., E. C. Stone, and C. D. Steenberg (2002), Composition of anomalous cosmic rays and other heliosphere ions, Astrophys. J., 578, 194-210.
8. Fisk, L. A., B. Kozlovsky, and R. Ramaty (1974), An interpretation of the observed oxygen and nitrogen enhancements in low energy cosmic rays, Astrophys. J., 190, L35-L38.
9. Florinski, V., and J. R. Jokipii (2003), Cosmic ray spectra at spherical termination shocks, Astrophys. J., 591, 454-460.
10. Jokipii, J. R. (1990), The anomalous component of cosmic rays, in Physics of the Outer Heliosphere, edited by S. Grzedzielski and D. E. Page, pp. 169-178, Elsevier, New York.
11. Hill, M. E., D. C. Hamilton, J. E. Mazur, and S. M. Krimigis (2003), Anomalous cosmic ray intensity variations in the inner and outer heliosphere during the solar cycle 22 recovery phase (1991-1999), J. Geophys. Res., 108(A10), 8037, doi:10.1029/2003JA009914.
12. Hovestadt, D., D. Vollmer, G. Gloeckler, and C. Y. Fan (1973), Differential energy spectra of low-energy (<8.5 MeV per Nucleon) heavy cosmic rays during solar quiet times, Phys. Rev. Lett., 31, 650-653.
13. Krimigis, S. M., et al. (2003), Voyager exited the solar wind at a distance of 85 AU from the Sun, Nature, 426, 45-48.
14. McDonald, F. B., et al. (1974), The anomalous abundance of cosmic ray nitrogen and oxygen at low energies, Astrophys. J., 187, L105-L108.
15. McDonald, F. B., H. Moraal, J. P. L. Reinecke, N. Lal, and R. E. MeGuirc (1992), The cosmic radiation in the heliosphere at successive solar minima, J. Geophys. Res., 97, 1557-1570.
16. McDonald, F. B., A. Lukasiak, and W. R. Webber (1995), Pioneer 10 and Voyager 1 observation of anomalous cosmic ray hydrogen in the outer heliosphere, Astrophys. J., 446, L101-L104.
17. McDonald, F. B., et al. (2001), Cosmic rays in the heliosphere over the solar minimum of cycle 22, Proc. Int. Conf. Cosmic Rays 27th, 1, 3830-3833.
18. McDonald, F. B., et al. (2003), Enhancements of energetic particles near the heliospheric termination shock, Nature, 426, 48-51.
19. Moraal, H., and C. D. Steenberg (1999), Basic properties of anomalous cosmic ray spectra, Proc. Int. Conf. Cosmic Rays 26th, 7, 543-547.
20. Pesses, M. E., J. R. Jokipii, and D. Eichler (1981), Cosmic ray drift, shock wave acceleration and the anomalous component of cosmic rays, Astrophys. J., L85-L88.
21. Potgieter, M. S., and U. W. Langner (2003), Modulation of anomalous protons with increasing solar activity, Adv. Space Res., 32, 687-692.
22. Stone, E. C., and A. C. Cummings (1999), A tilt model for anomalous cosmic rays and the location of the solar wind termination shock, Proc. Int. Conf. Cosmic Rays 26th, 7, 500-503.
23. Stone, E. C., and A. C. Cummings (2003), The approach of Voyager 1 to the termination shock, Proc. Int. Conf. Cosmic Rays 28th, 1, 3889-3892.
24. Stone, E. C., A. C. Cummings, D. C. Hamilton, M. E. Hill, and S. M. Krimigis (1999), Voyager observations of anomalous and galactic cosmic rays during 1998, Proc. Int. Conf. Cosmic Rays 26th, 7, 551-554.
25. Webber, W. R., F. B. McDonald, T. T. von Rosenvingc, and R. A. Mewaldt (1981), A study of the temporal and radial dependences of the anomalous helium and oxygen nuclei, Proc. Int. Conf. Cosmic Rays 17th, 10, 92-95.
26. Webber, W. R., et al. (1998), Anomalous cosmic rays and the 22-year solar modulation cycle, in Cosmic Rays in the Heliosphere, Space Sci. Ser. Of ISSI, vol. 3, edited by L. A. Fisk et al., pp. 194-199, Springer, New York.
27. Webber, W. R., F. B. McDonald, and A. Lukasiak (2003), Voyager 2 measurements in the outer heliosphere of the energy spectra of cosmic ray nuclei from <100 MeV/nucleon to more than 1 GeV/nucleon, Astrophys. J., 599, 582-595.