Abstract
The rates of the most important ionization processes acting in interplanetary space on interstellar H, He, C, O, Ne and Ar atoms are critically reviewed in the paper. Their long-term modulations in the period 1974 – 1994 are reexamined using updated information on relevant cross-sections as well as direct or indirect data on variations of the solar wind/solar EUV fluxes based on IMP 8 measurements and monitoring of the solar 10.7 cm radio emission. It is shown that solar cycle related variations are pronounced (factor of ∼ 3 between maximum and minimum) especially for species such as He, Ne, C for which photoionization is the dominant loss process. Species sensitive primarily to the charge-exchange (as H) show only moderate fluctuations ∼ 20% around average. It is also demonstrated that new techniques that make use of simultaneous observations of neutral He atoms on direct and indirect orbits, or simultaneous measurements of He+ and He++ pickup ions and solar wind particles can be useful tools for narrowing the uncertainties of the He photoionization rate caused by insufficient knowledge of the solar EUV flux and its variations.
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Afrosimov, V.V, Mamaev, Yu. A., Panov, M.N., and Fedorenko, N.V.: 1969, Sov. Phys. Tech. Phys. 14, 109
Allen, C.W. 1973: in Astrophysical Quantities, University of London, The Athlone Press
Askew, S.D., and Judge, D.L.: 1984, Planet. Space Sci. 32, 779
Axford W.I.: 1972, in Solar Wind, NASA SP-308, p.689
Barnett, C.F., Hunter, H.T., Kirkpatrick, M.I., Alvarez, I, Cisneros, C. and Phaneuf, R.A.: 1990, Atomic data for fusion, Oak Ridge Natl. Lab., ORNL-6086/VI
Cummings, A.C., and Stone, E.C.: 1996, Space Sci. Rev., this issue
Cummings, A.C., and Stone, E.C.: 1990, Proc. of 21-st Internat. Cosmic Ray Conf. 6, 202
Cummings, A.C., and Stone, E.C.: 1988, Proc. of the Sixth Internat. Solar Wind Conf. 2, 599
Ehrhardt, A.B., Langer, W.D.: 1987, Report PPPL-2477, Princeton University
Feng, W., Ogawa, H.S. and Judge, D.L.: 1989, J.Geophys. Res. 94, 9125
Geiss, J., Gloeckler, G., Mall, U., von Steiger, R., Galvin, A.B., and Ogilvie, K.W.: 1994, Astron. Astrophys. 282, 924
Gloeckler, G.: 1996, Space Sci. Rev., this issue
Gloeckler, G., and Geiss, J.: 1994, EOS Transactions 75 No 44, 512
Gloeckler, G., Geiss, J., Balsiger, H., Fisk, L.A., Galvin, A.B., Ipavich, F.M., Ogilvie, K.W., von Steiger, R., and Wilken, B.: 1993, Science 261, 70
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, J. Geophys. Res. 99, 17637
Gruntman, M.: 1994, J. Geophys. Res. 99, 19213
Holzer, T.E.: 1977, Revs. Geophys. Space Phys. 15, 467
Isenberg, P.A., and Feldman, W.C.: 1995, Geophys. Res. Lett. 22, 873
Lallement, R., Bertaux, J.-L., Chassefière, E., and Sandel, B.R.: 1991, Astron. Astrophys. 252, 385
Lotz, W.: 1967, Zeitschrift f. Physik, 206, 205
Maher, L.J., and Tinsley, B.A.: 1977, J. Geophys. Res. 82, 689
Marr, G.V., and West, J.B.: 1976, Atomic Data and Nucl. Data Tables 18, 497
Möbius, E., Hovestadt, D., Klecker, B., Scholer, M., Gloeckler, G., and Ipavich, M.: 1985, Nature 318, 426
Möbius, E., Klecker, B., Hovestadt, D., and Scholer, M.: 1988, Astrophys. Space Sci. 144, 487
Möbius, E., Rucinski, D., Hovestadt, D., and Klecker, B.: 1995, Astron. Astrophys. 304, 505
Nakai, Y., Shirai, T., Tabata, T., Ito, R.: 1987, Atomic Data and Nucl. Data Tables 37, 69
Ogawa, H.S., Canfield, L.R., McMullin, D., and Judge, D.L.: 1990, J.Geophys. Res. 95, 4291
Ogawa, H.S., and Judge, D.L.: 1986, J. Geophys. Res. 91, 7089
Ogawa, H.S., Phillips, E., and Judge, D.L.: 1993, AGU Spring Meeting — poster
Quèmerais, E., Bertaux, J.-L., Sandel, B.R., and Lallement, R.: 1994, Astron. Astrophys. 290, 941
Ratkiewicz, R., Ruciński, D., and Ip, W.-H: 1990, Astron. Astrophys. 230, 227
Richards, P.G., Fennelly, J.A., and Torr, D.G.: 1994, J. Geophys. Res. 99, 8981
Richards, P.G., and Torr, D.G.: 1984, J. Geophys. Res. 89, 5625
Ruciński, D., and Fahr, H.J.: 1991, Ann. Geophys. 9, 102
Ruciński, D., and Fahr, H.J.: 1989, Astron. Astrophys. 224, 290
Schwerin, R.: 1983, in Solar Wind Five, NASA CP-2280, p.489
Scime, E.E., Bame, S.J., Feldman, W.C., Gary, S.P., Phillips, J.L., and Balogh, A.: 1994, J. Geophys. Res. 99, 23401
Stebbings, R.F., Smith, A.C.H., and Ehrhardt, H.: 1964, J.Geophys. Res. 69, 2349
Tawara, H.: 1978, Atomic Data and Nucl. Data Tables 22, 491
Tobiska, W.K.: 1993, J. Geophys. Res. 98, 18,879
Torr, M.G., Torr, D.G., Ong, R.A., Hinteregger, H.E.: 1979, Geophys. Res. Lett. 6, 771
Witte, M., Rosenbauer, H., Banaszkiewicz, M., and Fahr, H.J..: 1993, Adv. Space Res. 13(6), 121
Witte, M., Banaszkiewicz, M., and Rosenbauer, H.: 1996, this issue
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Ruciński, D., Cummings, A.C., Gloeckler, G. et al. Ionization processes in the heliosphere — Rates and methods of their determination. Space Sci Rev 78, 73–84 (1996). https://doi.org/10.1007/BF00170794
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DOI: https://doi.org/10.1007/BF00170794