Abstract
The spectra of galactic cosmic rays that are observed inside the heliosphere result from the interaction of the spectra present in the local interstellar medium with the structured but turbulent magnetic field carried by the solar wind. Observational tests of solar modulation theory depend on comparisons between spectra inside and outside the heliosphere. Our knowledge of the local interstellar spectra are indirect, using extrapolations of interplanetary spectra measured at high energies where solar modulation effects are minimal and modeling of the physical processes that occur during particle acceleration and transport in the interstellar medium. The resulting estimates of the interstellar spectra can also be checked against observations of the effects that cosmic rays have on the chemistry of the interstellar medium and on the production of the diffuse galactic gamma-ray background. I review the present understanding of the local galactic cosmic-ray spectra, emphasizing the constraints set by observations and the uncertainties that remain.
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References
A.A. Abdo et al., Astrophys. J. 703, 1249 (2009)
M. Ackermann et al., Phys. Rev. D 82, 092004 (2010)
O. Adriani et al., Nature 458, 607 (2009)
O. Adriani et al., Phys. Rev. Lett. 105, 121101 (2010)
M. Aguilar et al., Phys. Rep. 366, 331 (2002)
F. Aharonian, Phys. Rev. Lett. 101, 261104 (2008)
F. Aharonian, et al., Astron. Astrophys. 508, 561 (2009)
M. Boezio et al., Astrophys. J. 532, 653 (2000)
M. Ave et al., Astrophys. J. 697, 106 (2009)
I. Büsching et al., Astrophys. J. 619, 314 (2005)
R.D. Blandford, J.P. Ostriker, Astrophys. J. 221, L29 (1978)
J. Chang et al., Nature 456, 362 (2008)
A. Dalgarno, Proc. Natl. Acad. Sci. USA 103, 12269 (2006)
A.J. Davis et al., in Acceleration and Transport of Energetic Particles in the Heliosphere: ACE 2000 Symposium, vol. CP528, ed. by R.A. Mewaldt et al. (Am. Inst. of Phys., Melville, 2000), p. 421
V.A. Dogiel et al., Astron. Astrophys. 508, 1 (2009)
M.A. DuVernois, Astrophys. J. 559, 296 (2001)
L.A. Fisk, J. Geophys. Res. 76, 1 (1971)
J.S. George et al., Astrophys. J. 698, 1666 (2009)
A.E. Glassgold, W.D. Langer, Astrophys. J. 193, 73 (1974)
L.J. Gleeson, W.I. Axford, Astrophys. J. 154, 1011 (1968)
K. Herbst et al., J. Geophys. Res. 115, D00120 (2010). doi:10.1029/2009JD012557
J.C. Higdon, R.E. Lingenfelter, in Acceleration and Transport of Energetic Particles in the Heliosphere: ACE 2000 Symposium, vol. CP528, ed. by R.A. Mewaldt et al. (Am. Inst. of Phys., Melville, 2000), p. 429
N. Indriolo et al., Astrophys. J. 671, 1736 (2007)
N. Indriolo et al., Astrophys. J. 694, 257 (2009)
J.R. Jokipii, Rev. Geophys. Space Phys. 9, 27 (1971)
J.R. Jokipii, E.H. Levy, W.B. Hubbard, Astrophys. J. 213, 861 (1977)
T. Kamae et al., Astrophys. J. 647, 692 (2006)
N. Kawanaka, K. Ioka, M. Nojiri, Astrophys. J. 710, 958 (2010)
T. Kobayashi et al., Astrophys. J. 601, 340 (2004)
A.W. Labrador, R.A. Mewaldt, Astrophys. J. 480, 371 (1997)
P.C. Liewer et al., in Space Technology and Applications International Forum—2000, vol. CP504, ed. by M.S. El-Gend (Am. Inst. of Phys., Melville, 2000), p. 911
B.J. McCall et al., Nature 422, 501 (2003)
R.L. McNutt et al., in Space Technology and Applications International Forum—2000, vol. CP504, ed. by M.S. El-Gend (Am. Inst. of Phys., Melville, 2000), p. 917
R.L. McNutt et al., Acta Astron. (2010). doi:10.1016/j.actaastro.2010.07.005
M. Meneguzzi, J. Audouze, H. Reeves, Astron. Astrophys. 15, 337 (1971)
R.A. Mewaldt, P.C. Liewer, in The Outer Heliosphere: The Next Frontiers, ed. by K. Scherer et al. COSPAR Colloquia Series, vol. 11. (Pergamon, Amsterdam, 2001), p. 451
M. Mori, Astropart. Phys. 31, 341 (2009)
I.V. Moskalenko, A.W. Strong, Astrophys. J. 493, 694 (1998)
I.V. Moskalenko, A.W. Strong, J.F. Ormes, M.S. Potgieter, Astrophys. J. 565, 280 (2002)
B.B. Nath, P.L. Biermann, Mon. Not. R. Astron. Soc. 267, 447 (1994)
S.M. Niebur et al., J. Geophys. Res. 108, 8033 (2003)
M. Padovani, D. Galli, A.E. Glassgold, Astron. Astrophys. 501, 619 (2009)
M. Pohl, J.A. Esposito, Astrophys. J. 507, 327 (1998)
R. Ramaty, Astron. Astrophys. Suppl. Ser. 120, 373 (1996)
J.P. Roberts, J. Cosmol. Astropart. Phys. 2, 29 (2011)
M. Simon, A. Molnar, S. Roesler, Astrophys. J. 499, 250 (1998)
A.W. Strong, I. Moskalenko, V.S. Ptuskin, Annu. Rev. Nucl. Part. Sci. 57, 285 (2007)
A.W. Strong, I. Moskalenko, O. Reimer, Astrophys. J. 2004, 962 (2004)
B.J. Teegarden, K. Watanabe, Astrophys. J. 646, 965 (2006)
N. Tomassetti et al., Proc. ICRC 31th (Lodz) (2009). arXiv:1009.1908v1
S. Torii et al., Astrophys. J. 559, 973 (2001)
S. Torii et al. (2008). arXiv:0809.0760v1
I.G. Usoskin et al., J. Geophys. Res. 110, A12108 (2005). doi:10.1029/2005JA011250
W.R. Webber, Astrophys. J. 506, 329 (1998)
W.R. Webber, P.R. Higbie, J. Geophys. Res. 113, A11106 (2008). doi:10.1029/2008JA013386
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Wiedenbeck, M.E. Cosmic-Ray Energy Spectra and Time Variations in the Local Interstellar Medium: Constraints and Uncertainties. Space Sci Rev 176, 35–46 (2013). https://doi.org/10.1007/s11214-011-9778-8
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DOI: https://doi.org/10.1007/s11214-011-9778-8