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Solar Physics

, 294:32 | Cite as

Helium Suppression in Impulsive Solar Energetic-Particle Events

  • Donald V. ReamesEmail author
Article

Abstract

We have studied the element abundances and energy spectra of the small “He-poor” impulsive solar energetic-particle (SEP) events, comparing them with other impulsive SEP events with more-normal abundances of He. He-poor events can have abundances as low as He/O ≈ 2, while both impulsive and gradual SEP events usually have source abundances of \(30 \leq \mbox{He/O} \leq 100\) with mean values of ≈ 50 – 60. He/C ratios are not only low, but often decrease with energy in He-poor events. Abundance enhancement patterns of other elements with atomic numbers \(6 \leq Z \leq 56\), and likely values of their mass-to-charge ratios \(A\)/\(Q\), are generally unaltered in He-poor events, as are the probable source-plasma temperatures of 2.5 – 3.2 MK for all impulsive SEP events. One He-poor event is also an example of a rarer C-poor event with \(\mbox{C/O} = 0.08 \pm 0.04\), suppressed by a factor over five from the mean. We discuss suggestions of a possible \(A\)/\(Q\) threshold during acceleration and of the sluggish ionization of He entering the corona, because of its uniquely high first ionization potential (FIP), but the suppression of He and the decline of He/C with energy is difficult to explain if both He and C are fully ionized with \(A\mbox{/}Q = 2\) as expected at 2.5 – 3.2 MK. Although less dramatic, a possible excess enhancement of Ne in some impulsive SEP events is also considered. Possible causes of the large ≈ 30% spectral and abundance variations in impulsive events are also discussed. However, the physics of the He-poor events remains a mystery.

Keywords

Solar energetic particles Solar system abundances Solar flares 

Notes

Acknowledgements

The author thanks Chee Ng and Steve Kahler for helpful comments on this manuscript.

Disclosure of Potential Conflicts of Interest

The author declares he has no conflicts of interest.

References

  1. Asplund, M., Grevesse, N., Sauval, A.J., Scott, P.: 2009, The chemical composition of the Sun. Annu. Rev. Astron. Astrophys. 47, 481. DOI. ADSCrossRefGoogle Scholar
  2. Bochsler, P.: 2009, Composition of matter in the heliosphere. Proc. IAU Sympos. 257, 17. DOI. ADSCrossRefGoogle Scholar
  3. Breneman, H.H., Stone, E.C.: 1985, Solar coronal and photospheric abundances from solar energetic particle measurements. Astrophys. J. Lett. 299, L57. DOI. ADSCrossRefGoogle Scholar
  4. Bučík, R., Innes, D.E., Mall, U., Korth, A., Mason, G.M., Gómez-Herrero, R.: 2014, Multi-spacecraft observations of recurrent 3He-rich solar energetic particles. Astrophys. J. 786, 71. DOI. ADSCrossRefGoogle Scholar
  5. Bučík, R., Innes, D.E., Chen, N.H., Mason, G.M., Gómez-Herrero, R., Wiedenbeck, M.E.: 2015, Long-lived energetic particle source regions on the Sun. J. Phys. Conf. Ser. 642, 012002. DOI. CrossRefGoogle Scholar
  6. Bučík, R., Innes, D.E., Mason, G.M., Wiedenbeck, M.E., Gómez-Herrero, R., Nitta, N.V.: 2018, 3He-rich solar energetic particles in helical jets on the Sun. Astrophys. J. 852, 76. DOI. ADSCrossRefGoogle Scholar
  7. Caffau, E., Ludwig, H.-G., Steffen, M., Freytag, B., Bonofacio, P.: 2011, Solar chemical abundances determined with a CO5BOLD 3D model atmosphere. Solar Phys. 268, 255. DOI. ADSCrossRefGoogle Scholar
  8. Chen, N.H., Bučík, R., Innes, D.E., Mason, G.M.: 2015, Case studies of multi-day 3He-rich solar energetic particle periods. Astron. Astrophys. 580, 16. DOI. CrossRefGoogle Scholar
  9. Cliver, E.W., Kahler, S.W., Reames, D.V.: 2004, Coronal shocks and solar energetic proton events. Astrophys. J. 605, 902. DOI. ADSCrossRefGoogle Scholar
  10. Desai, M.I., Giacalone, J.: 2016, Large gradual solar energetic particle events. Living Rev. Solar Phys.. DOI. CrossRefGoogle Scholar
  11. Desai, M.I., Mason, G.M., Dwyer, J.R., Mazur, J.E., Gold, R.E., Krimigis, S.M., Smith, C.W., Skoug, R.M.: 2003, Evidence for a suprathermal seed population of heavy ions accelerated by interplanetary shocks near 1 AU. Astrophys. J. 588, 1149. DOI. ADSCrossRefGoogle Scholar
  12. DiFabio, R., Guo, Z., Möbius, E., Klecker, B., Kucharek, H., Mason, G.M., Popecki, M.: 2008, Energy-dependent charge states and their connection with ion abundances in impulsive solar energetic particle events. Astrophys. J. 687, 623. DOI. ADSCrossRefGoogle Scholar
  13. Drake, J.F., Cassak, P.A., Shay, M.A., Swisdak, M., Quataert, E.: 2009, A magnetic reconnection mechanism for ion acceleration and abundance enhancements in impulsive flares. Astrophys. J. Lett. 700, L16. DOI. ADSCrossRefGoogle Scholar
  14. Fisk, L.A.: 1978, 3He-rich flares – a possible explanation. Astrophys. J. 224, 1048. DOI. ADSCrossRefGoogle Scholar
  15. Gosling, J.T.: 1993, The solar flare myth. J. Geophys. Res. 98, 18937. DOI. ADSCrossRefGoogle Scholar
  16. Kahler, S.W., Reames, D.V., Sheeley, N.R. Jr.: 2001, Coronal mass ejections associated with impulsive solar energetic particle events. Astrophys. J. 562, 558. DOI. ADSCrossRefGoogle Scholar
  17. Kahler, S.W., Sheeley, N.R. Jr., Howard, R.A., Koomen, M.J., Michels, D.J.: 1984, Associations between coronal mass ejections and solar energetic proton events. J. Geophys. Res. 89, 9683. DOI. ADSCrossRefGoogle Scholar
  18. Laming, J.M.: 2009, Non-WKB models of the first ionization potential effect: implications for solar coronal heating and the coronal helium and neon abundances. Astrophys. J. 695, 954. DOI. ADSCrossRefGoogle Scholar
  19. Laming, J.M.: 2015, The FIP and inverse FIP effects in solar and stellar coronae. Living Rev. Solar Phys. 12, 2. DOI. ADSCrossRefGoogle Scholar
  20. Lee, M.A.: 1983, Coupled hydromagnetic wave excitation and ion acceleration at interplanetary traveling shocks. J. Geophys. Res. 88, 6109. DOI. ADSCrossRefGoogle Scholar
  21. Lee, M.A.: 2005, Coupled hydromagnetic wave excitation and ion acceleration at an evolving coronal/interplanetary shock. Astrophys. J. Suppl. 158, 38. DOI. ADSCrossRefGoogle Scholar
  22. Lee, M.A., Mewaldt, R.A., Giacalone, J.: 2012, Shock acceleration of ions in the heliosphere. Space Sci. Rev. 173, 247. DOI. ADSCrossRefGoogle Scholar
  23. Lodders, K., Palme, H., Gail, H.-P.: 2009, Abundances of the elements in the solar system. In: Trümper, J.E. (ed.) Landolt–Börnstein, New Series VI 4B, Springer, Berlin, 560. Chapter 4.4. Google Scholar
  24. Luhn, A., Klecker, B., Hovestadt, D., Möbius, E.: 1987, The mean ionic charge of silicon in He-3-rich solar flares. Astrophys. J. 317, 951. DOI. ADSCrossRefGoogle Scholar
  25. Mason, G.M.: 2007, 3He-rich solar energetic particle events. Space Sci. Rev. 130, 231. DOI. ADSCrossRefGoogle Scholar
  26. Mason, G.M., Gloeckler, G., Hovestadt, D.: 1979, Carbon-poor solar flare events. Astrophys. J. 231, 87. DOI. ADSCrossRefGoogle Scholar
  27. Mason, G.M., Mazur, J.E., Dwyer, J.R.: 2002, A new heavy ion abundance enrichment pattern in 3He-rich solar particle events. Astrophys. J. Lett. 565, L51. DOI. ADSCrossRefGoogle Scholar
  28. Mason, G.M., Mazur, J.E., Dwyer, J.R., Jokippi, J.R., Gold, R.E., Krimigis, S.M.: 2004, Abundances of heavy and ultraheavy ions in 3He-rich solar flares. Astrophys. J. 606, 555. DOI. ADSCrossRefGoogle Scholar
  29. Mason, G.M., Nitta, N.V., Wiedenbeck, M.E., Innes, D.E.: 2016, Evidence for a common acceleration mechanism for enrichments of 3He and heavy ions in impulsive SEP events. Astrophys. J. 823, 138. DOI. ADSCrossRefGoogle Scholar
  30. Mazzotta, P., Mazzitelli, G., Colafrancesco, S., Vittorio, N.: 1998, Ionization balance for optically thin plasmas: rate coefficients for all atoms and ions of the elements H to Ni. Astron. Astrophys. Suppl. Ser. 133, 403. DOI. ADSCrossRefGoogle Scholar
  31. Mewaldt, R.A., Cohen, C.M.S., Leske, R.A., Christian, E.R., Cummings, A.C., Stone, E.C., von Rosenvinge, T.T., Wiedenbeck, M.E.: 2002, Fractionation of solar energetic particles and solar wind according to first ionization potential. Adv. Space Res. 30, 79. DOI. ADSCrossRefGoogle Scholar
  32. Meyer, J.-P.: 1985, The baseline composition of solar energetic particles. Astrophys. J. Suppl. 57, 151. DOI. ADSCrossRefGoogle Scholar
  33. Ng, C.K., Reames, D.V.: 2008, Shock acceleration of solar energetic protons: the first 10 minutes. Astrophys. J. Lett. 686, L123. DOI. ADSCrossRefGoogle Scholar
  34. Ng, C.K., Reames, D.V., Tylka, A.J.: 1999, Effect of proton-amplified waves on the evolution of solar energetic particle composition in gradual events. Geophys. Res. Lett. 26, 2145. DOI. ADSCrossRefGoogle Scholar
  35. Ng, C.K., Reames, D.V., Tylka, A.J.: 2001, Abundances, spectra, and anisotropies in the 1998 Sep. 30 and 2000 Apr. 4 large SEP events. In: Proc. 27th Int. Cosmic-Ray Conf., Hamburg, 8, 3140. Google Scholar
  36. Ng, C.K., Reames, D.V., Tylka, A.J.: 2003, Modeling shock-accelerated solar energetic particles coupled to interplanetary Alfvén waves. Astrophys. J. 591, 461. DOI. ADSCrossRefGoogle Scholar
  37. Ng, C.K., Reames, D.V., Tylka, A.J.: 2012, Solar energetic particles: shock acceleration and transport through self-amplified waves. AIP Conf. Proc. 1436, 212. DOI. ADSCrossRefGoogle Scholar
  38. Parker, E.N.: 1963, Interplanetary Dynamical Processes, Interscience, New York. zbMATHGoogle Scholar
  39. Post, D.E., Jensen, R.V., Tarter, C.B., Grasberger, W.H., Lokke, W.A.: 1977, Steady-state radiative cooling rates for low-density, high temperature plasmas. At. Data Nucl. Data Tables 20, 397. DOI. ADSCrossRefGoogle Scholar
  40. Reames, D.V.: 1988, Bimodal abundances in the energetic particles of solar and interplanetary origin. Astrophys. J. Lett. 330, L71. DOI. ADSCrossRefGoogle Scholar
  41. Reames, D.V.: 1995, Coronal abundances determined from energetic particles. Adv. Space Res. 15(7), 41. CrossRefGoogle Scholar
  42. Reames, D.V.: 1999, Particle acceleration at the Sun and in the heliosphere. Space Sci. Rev. 90, 413. DOI. ADSCrossRefGoogle Scholar
  43. Reames, D.V.: 2000, Abundances of trans-iron elements in solar energetic particle events. Astrophys. J. Lett. 540, L111. DOI. ADSCrossRefGoogle Scholar
  44. Reames, D.V.: 2013, The two sources of solar energetic particles. Space Sci. Rev. 175, 53. DOI. ADSCrossRefGoogle Scholar
  45. Reames, D.V.: 2014, Element abundances in solar energetic particles and the solar corona. Solar Phys. 289, 977. DOI. ADSCrossRefGoogle Scholar
  46. Reames, D.V.: 2015, What are the sources of solar energetic particles? Element abundances and source plasma temperatures. Space Sci. Rev. 194, 303. DOI. ADSCrossRefGoogle Scholar
  47. Reames, D.V.: 2016a, Temperature of the source plasma in gradual solar energetic particle events. Solar Phys. 291, 911. DOI. ADSCrossRefGoogle Scholar
  48. Reames, D.V.: 2016b, The origin of element abundance variations in solar energetic particles. Solar Phys. 291, 2099. DOI. ADSCrossRefGoogle Scholar
  49. Reames, D.V.: 2017a, Solar Energetic Particles. Lecture Notes in Physics 932, Springer, Berlin. DOI. ISBN 978-3-319-50870-2. CrossRefGoogle Scholar
  50. Reames, D.V.: 2017b, The abundance of helium in the source plasma of solar energetic particles. Solar Phys. 292, 156. DOI. arXiv. ADSCrossRefGoogle Scholar
  51. Reames, D.V.: 2018a, The “FIP effect” and the origins of solar energetic particles and of the solar wind. Solar Phys. 293, 47. DOI. arXiv. ADSCrossRefGoogle Scholar
  52. Reames, D.V.: 2018b, Abundances, ionization states, temperatures, and FIP in solar energetic particles. Space Sci. Rev. 214, 61. DOI. arXiv. ADSCrossRefGoogle Scholar
  53. Reames, D.V.: 2018c, Corotating shock waves and the solar-wind source of energetic ion abundances: power laws in A/Q. Solar Phys. 293, 144. DOI. arXiv. ADSCrossRefGoogle Scholar
  54. Reames, D.V.: 2019a, Hydrogen and the abundances of elements in impulsive solar energetic-particle events. Solar Phys., arXiv, submitted.
  55. Reames, D.V.: 2019b, Hydrogen and the abundances of elements in gradual solar energetic-particle events. Solar Phys., arXiv, submitted.
  56. Reames, D.V., Cliver, E.W., Kahler, S.W.: 2014a, Abundance enhancements in impulsive solar energetic-particle events with associated coronal mass ejections. Solar Phys. 289, 3817. DOI. ADSCrossRefGoogle Scholar
  57. Reames, D.V., Cliver, E.W., Kahler, S.W.: 2014b, Variations in abundance enhancements in impulsive solar energetic-particle events and related CMEs and flares. Solar Phys. 289, 4675. DOI. ADSCrossRefGoogle Scholar
  58. Reames, D.V., Cliver, E.W., Kahler, S.W.: 2015, Temperature of the source plasma for impulsive solar energetic particles. Solar Phys. 290, 1761. DOI. ADSCrossRefGoogle Scholar
  59. Reames, D.V., Meyer, J.P., von Rosenvinge, T.T.: 1994, Energetic-particle abundances in impulsive solar flare events. Astrophys. J. Suppl. 90, 649. DOI. ADSCrossRefGoogle Scholar
  60. Reames, D.V., Ng, C.K.: 2004, Heavy-element abundances in solar energetic particle events. Astrophys. J. 610, 510. DOI. ADSCrossRefGoogle Scholar
  61. Reames, D.V., Ng, C.K., Berdichevsky, D.: 2001, Angular distributions of solar energetic particles. Astrophys. J. 550, 1064. DOI. ADSCrossRefGoogle Scholar
  62. Reames, D.V., Stone, R.G.: 1986, The identification of solar 3He-rich events and the study of particle acceleration at the Sun. Astrophys. J. 308, 902. DOI. ADSCrossRefGoogle Scholar
  63. Reames, D.V., von Rosenvinge, T.T., Lin, R.P.: 1985, Solar 3He-rich events and nonrelativistic electron events – a new association. Astrophys. J. 292, 716. DOI. ADSCrossRefGoogle Scholar
  64. Roth, I., Temerin, M.: 1997, Enrichment of 3He and heavy ions in impulsive solar flares. Astrophys. J. 477, 940. DOI. ADSCrossRefGoogle Scholar
  65. Rouillard, A., Sheeley, N.R., Tylka, A., Vourlidas, A., Ng, C.K., Rakowski, C., Cohen, C.M.S., Mewaldt, R.A., Mason, G.M., Reames, D., et al.: 2012, The longitudinal properties of a solar energetic particle event investigated using modern solar imaging. Astrophys. J. 752, 44. DOI. ADSCrossRefGoogle Scholar
  66. Schmelz, J.T., Reames, D.V., von Steiger, R., Basu, S.: 2012, Composition of the solar corona, solar wind, and solar energetic particles. Astrophys. J. 755, 33. DOI. ADSCrossRefGoogle Scholar
  67. Serlemitsos, A.T., Balasubrahmanyan, V.K.: 1975, Solar particle events with anomalously large relative abundance of 3He. Astrophys. J. 198, 195. DOI. ADSCrossRefGoogle Scholar
  68. Steinacker, J., Meyer, J.P., Steinacker, A., Reames, D.V.: 1997, The helium valley: comparison of impulsive solar flare ion abundances and gyroresonant acceleration with oblique turbulence in a hot multi-ion plasma. Astrophys. J. 476, 403. DOI. ADSCrossRefGoogle Scholar
  69. Temerin, M., Roth, I.: 1992, The production of 3He and heavy ion enrichment in 3He-rich flares by electromagnetic hydrogen cyclotron waves. Astrophys. J. Lett. 391, L105. DOI. ADSCrossRefGoogle Scholar
  70. Tylka, A.J., Lee, M.A.: 2006, Spectral and compositional characteristics of gradual and impulsive solar energetic particle events. Astrophys. J. 646, 1319. DOI. ADSCrossRefGoogle Scholar
  71. Tylka, A.J., Cohen, C.M.S., Dietrich, W.F., Lee, M.A., Maclennan, C.G., Mewaldt, R.A., Ng, C.K., Reames, D.V.: 2005, Shock geometry, seed populations, and the origin of variable elemental composition at high energies in large gradual solar particle events. Astrophys. J. 625, 474. DOI. ADSCrossRefGoogle Scholar
  72. von Rosenvinge, T.T., Barbier, L.M., Karsch, J., Liberman, R., Madden, M.P., Nolan, T., Reames, D.V., Ryan, L., Singh, S., Trexel, H.: 1995, The energetic particles: acceleration, composition, and transport (EPACT) investigation on the wind spacecraft. Space Sci. Rev. 71, 152. DOI. CrossRefGoogle Scholar
  73. Zank, G.P., Rice, W.K.M., Wu, C.C.: 2000, Particle acceleration and coronal mass ejection driven shocks: a theoretical model. J. Geophys. Res. 105, 25079. DOI. ADSCrossRefGoogle Scholar

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© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Institute for Physical Science and TechnologyUniversity of MarylandCollege ParkUSA

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