Abstract
Knowledge of injection and pre-acceleration mechanisms of ions is of fundamental importance for understanding particle acceleration that takes place in various astrophysical settings. The heliosphere offers the best chance to study these poorly understood processes experimentally. We examine ion injection and pre-acceleration using measurements of the bulk and suprathermal solar wind, and pickup ions. Our most puzzling observation is that high-velocity tails, extending to at least 60 keV/e — the upper limit of measurements —, are omnipresent in the slow, in-ecliptic solar wind; these tails exist even in the absence of any shocks. The cause of these tails is unknown. In the disturbed solar wind inside CIRs and downstream of shocks and waves these high-speed tails in the distributions of H+, He+ and He++ become more pronounced and more complex, but with the shapes of the tails showing the same dependence on ion speed for the different species. Pickup hydrogen and helium are found to be readily injected for subsequent acceleration to MeV energies, and thus are the dominant source of CIR-accelerated energetic ions. Competing sources of MeV ions heavier than He are: (1) heated suprathermal solar wind observed downstream of CIR shocks, (2) interstellar N, O and Ne, and (3) the newly discovered heavy pickup ions from an extended inner source inside 1 AU. Our main conclusion is that mechanisms other than the traditional first-order shock acceleration process produce most of the modestly accelerated ions seen in the slow solar wind.
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References
Balogh, A., Gonzalez-Esparza, J. A., Forsyth, R. J., Burton, M. E., Goldstein, B. E., Smith, E. J., and Bame, S. J.: 1995, ‘Interplanetary Shock Waves: Ulysses Observations In and Out of the Ecliptic Plane’, Space Sci. Rev. 72, 171–180.
Fisk, L. A.: 1996, ‘Implications of a Weak Termination Shock’, Space Sci. Rev. 78, 129–136.
Fränz, M., Keppler, E., Krupp, N., Rouss, M. K., and Blake, J. B.: 1995, ‘The Elemental Composition in Energetic Particle Events at High Heliospheric Latitudes’, Space Sci. Rev. 72, 339–342.
Geiss, J., Gloeckler, G., Fisk, L. A. and von Steiger, R.: 1995, ‘C+ Pickup Ions in the Heliosphere and Their Origin’, J. Geophys. Res. 100, 23,373–23,377.
Geiss, J., Gloeckler, G., and von Steiger, R.: 1996, ‘Origin of C+ Ions in the Heliosphere’, ISSI Workshop, Space Sci. Rev. 78, 43–52.
Gloeckler, G., Hovestadt, D., and Fisk, L. A.: 1979, ‘Observed Distribution Functions of H, He, C, O, and Fe in Corotating Energetic Particle Streams: Implications for Interplanetary Acceleration and Propagation’, Astrophys. J. 230, L191 - L195.
Gloeckler, G., Geiss, J., Balsiger, H., Bedini, P., Cain, J. C., Fischer, J., Fisk, L. A., Galvin, A. B., Gliem, F., Hamilton, D.C., Hollweg, J. V., Ipavich, F. M., Joos, R., Livi, S., Lundgren, R., Mall, U., McKenzie, J. F., Ogilvie, K. W., Ottens, F., Rieck, W., Turns, E. O., von Steiger, R., Weiss, W., and Wilken, B.: 1992, ‘The Solar Wind Ion Composition Spectrometer’, Astron. Astrophys. Suppl. Ser. 92, 267–289.
Gloeckler, G., Geiss, J., Roelof, E. C., Fisk, L. A., Ipavich, F. M., Ogilvie, K. W., Lanzerotti, L. J., von Steiger, R., and Wilken, B.: 1994, ‘Acceleration of Interstellar Pickup Ions in the Disturbed Solar Wind Observed on Ulysses’, J. Geophys. Res. 99, 17,637–17,643.
Gloeckler, G., Schwadron, N. A., Fisk L. A., and Geiss J.: 1995, ‘Weak Pitch Angle Scattering of few MV Rigidity Ions from Measurements of Anisotropies in the Distribution Function of Interstellar Pickup H+’, Geophys. Res. Lett. 22, 2665–2668.
Gloeckler, G.: 1996, ‘The Abundance of Atomic 1H, 4He, and 3He in the Local Interstellar Cloud from Pickup Ion Observations with SWICS on Ulysses’, in R. von Steiger, R. Lallement, and M. A. Lee (eds.), The Heliosphere in the Local Interstellar Medium, Proc. of the First ISSI Workshop, Space Sci. Rev. 78, 335–346.
Gloeckler, G., and Geiss, J.: 1998, `Interstellar and Inner Source Pickup Ions Observed with SWICS on Ulysses’, Space Sci. Rev. 86, 127–159.
Gloeckler, G., Fisk, L. A., Geiss, J., Schwadron, N. A., and Zurbuchen, T. H.: 1999, ‘The Elemental Composition of the Inner Source Pickup Ions’, J. Geophys. Res. in press.
Gruntman, M.: 1996, 112 Pickup Ions in the Solar Wind: Outgassing of Interplanetary Dust’, J. Geophys. Res. 101, 15,555–15,568.
Hovestadt, D., Klecker, B., Gloeckler, G., 1pavich, F. M., and Scholer, M.: 1984, ‘Survey of He+/He2+ Abundance Ratios in Energetic Particle Events’, Astrophys. J. Lett. 282, L39 - L42.
Keppler, E.,: 1998, ‘The Acceleration of Charged Particles in Corotating Interaction Regions (CIR) -A Review with Particular Emphasis on the Ulysses Mission’, Surveys in Geophysics 19, 211–278.
Maclennan, C. G., and Lanzerotti, L. J.: 1998, ‘Low Energy Anomalous Ions at Northern Heliolatitudes’, Geophys. Res. Lett. 25, 3473–3476.
Reames, D. V., Richardson, I. G., and Barbier, L. M.: 1991, ‘On the Differences in Element Abundances of Energetic Ions from Corotating Events and from Large Solar Events’, Astrophys. J. Lett. 382, L43 - L46.
Scholer, M., Hovestadt, D., Klecker, B., and Gloeckler, G.: 1979, ‘The Composition of Energetic Particles in Corotating Events’, Astrophys. J. 227, 323–328.
Scholer, M.: 1999, ‘Injection and Acceleration Processes in Corotating Interaction Regions: Theoretical Concepts’, Space Sci. Rev, this volume, 105–114.
Schwadron, N. A., Fisk, L. A., and Gloeckler, G.: 1996, ‘Statistical Acceleration of Interstellar Pickup Ions in Corotating Interaction Regions’, Geophys. Res. Lett. 23, 2871–2874.
Wimmer-Schweingruber, R. F., von Steiger, R., and Paerli, R.: 1997, ‘Solar Wind Stream Interfaces in Corotating Interaction Regions: SWICS/Ulysses Results’, J. Geophys. Res. 102, 17,407–17,417.
Wimmer-Schweingruber, R. F., von Steiger, R., and Paerli, R.: 1999, ‘Solar Wind Stream Interfaces in Corotating Interaction Regions: New SWICS/Ulysses Results’, J. Geophys. Res. 104, 9, 339,946.
Vasyliunas, V. M., and Siscoe, G. L.: 1976, ‘On the Flux and the Energy Spectrum of Interstellar Ions in the Solar System’, J. Geophys. Res. 81, 1,247–1,252.
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Gloeckler, G. (1999). Observation of Injection and Pre-Acceleration Processes in the Slow Solar Wind. In: Balogh, A., Gosling, J.T., Jokipii, J.R., Kallenbach, R., Kunow, H. (eds) Corotating Interaction Regions. Space Sciences Series of ISSI, vol 7. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1179-1_7
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DOI: https://doi.org/10.1007/978-94-017-1179-1_7
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