Abstract
The energy dependence of a fraction of ring current protons of ionospheric origin is calculated using the AMPTE/CCE data for a typical strong magnetic storm (max|D st | ≈ 120 nT). It is shown that this fraction monotonically decreases from ∼ 83 to 25–30% with an increase in proton energy from 5 to 315 keV at L = 6–7 (L is the McIlwain parameter) and is 30–40% at energy 40–50 keV corresponding to the maximum of proton energy density at L = 6–7. It is demonstrated that the core of the ring current (L = 3.7–4.7) was enriched by solar protons with E ≈ 10–200 keV during the active phase of the storm (the maximum effect is reached at E ≈ 20–50 keV).
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Spjeldvik, W.N. and Fritz, T.A., Experimental Determination of Geomagnetically Trapped Energetic Heavy Ion Fluxes, in Energetic Ion Composition in the Earth’s Magnetosphere, Johnson, R.G., Ed., Tokyo: Terra Sci., 1983, pp. 369–421.
Panasyuk, M.I., The Ion Radiation Belts: Experiments and Models, in Effects of Space Weather on Technology Infrastructure, Daglis, L.A., Ed., Netherlands: Kluwer Academic, 2004, pp. 65–90.
Hovestadt, D., Gloeckler, G., Fan, C.Y., et al., Evidence for Solar Wind Origin of Energetic Heavy Ions in the Earth’s Radiation Belt, Geophys. Rev. Lett., 1978, vol. 5, pp. 1055–1058.
Kovtyukh, A.S., Geocorona of Hot Plasma, Kosm. Issled., 2001, vol. 39, no. 6, pp. 563–596.
Hamilton, D.C., Gloeckler, G., Ipavich, F.M., et al., Ring Current Development during the Great Geomagnetic Storm of February 1986, J. Geophys. Res., 1988, vol. 93, pp. 14343–14355.
Daglis, I.A., The Role of Magnetosphere-Ionosphere Coupling in Magnetic Storm Dynamics, in Magnetic Storms, Tsurutani, B. et al., Eds., vol. 98 of Geophys. Monogr. Ser., Washington, DC: AGU, 1997, pp. 107–116.
Balsiger, H., Eberhardt, P., Geiss, J., and Young, D.T., Magnetic Storm Injection of 0.9 to 16 keV/e Solar and Terrestrial Ions into the High-Altitude Magnetosphere, J. Geophys. Res., 1980, vol. 85, pp. 1645–1662.
Sharp, R.D., Johnson, R.G., Lennartsson, W., et al., Hot Plasma Composition Results from the IEEE-1 Spacecraft, in Energetic Ion Composition in the Earth’s Magnetosphere, Johnson, R.G., Ed., Tokyo: Terra Sci., 1983, pp. 231–261.
Gloeckler, G. and Hamilton, D.C., AMPTE Ion Composition Results, Phys. Scr., 1987, vol. T18, pp. 73–84.
Kovtyukh, A.S., Relative Contributions of Ionospheric and Solar Ions Sources to the Ring Current and Plasma Sheet of the Geomagnetosphere: A New Method of Analysis, Kosm. Issled., 2000, vol. 38, no. 3, pp. 233–243.
Ermolaev, Yu.I., Observations of 4He++ Ions in the Solar Wind, Kosm. Issled., 1994, vol. 32, no. 1, pp. 93–125.
Kovtyukh, A.S., Relative Contributions of Ionospheric and Solar Ions Sources to the Ring Current and Plasma Sheet of the Geomagnetosphere: Experimental Data Analysis by a New Method, Kosm. Issled., 2000, vol. 38, no. 4, pp. 347–362.
Gloeckler, G., Wilken, B., Studemann, W., et al., First Composition Measurements of the Bulk of the Storm Time Ring Current (1 to 300 keV/e) with AMPTE/CCE, Geophys. Res. Lett., 1985, vol. 12, pp. 325–328.
Smith, P.H. and Bewtra, N.K., Charge Exchange Life-times for Ring Current Ions, Space Sci. Rev., 1978, vol. 22, pp. 301–318.
Author information
Authors and Affiliations
Additional information
Original Russian Text © A.S. Kovtyukh, 2006, published in Kosmicheskie Issledovaniya, 2006, Vol. 44, No. 5, pp. 411–415.
Rights and permissions
About this article
Cite this article
Kovtyukh, A.S. Energy dependence of the fraction of protons of ionospheric origin in the ring current. Cosmic Res 44, 393–397 (2006). https://doi.org/10.1134/S0010952506050029
Received:
Issue Date:
DOI: https://doi.org/10.1134/S0010952506050029