Abstract
Time variations in the fluxes of the suprathermal (0.04–2 MeV/nucleon) ions 3He, 4He, C, O, and Fe are studied together with their relative abundances in the 23rd and 24th solar cycles (SCs) using data from the ULEIS instrument on board the ACE spacecraft. Positive correlations are found between the intensities of these ions detected at 1 AU and parameters of solar activity, indicating that these suprathermal ions originate predominantly in active processes on the Sun. The intensities of all ions at the activity maximum were lower in SC 24 than in SC 23, in both perturbed and quiescent periods of these cycles. In contrast, the time behaviors of the ratios 3He/4He, C/O, and Fe/O were different, and dependent on the primary ionization potential of the ions. The distribution of Fe/O shows higher medium and median values in SC 23, while the distributions of C/O and 3He/4He for SC 23 and SC 24 did not display appreciable differences. The results obtained suggest that the fluxes of Fe ions from the Sun during flares and in the corona were lower in SC 24 than in SC 23 to a greater extent than were the fluxes of 3He, 4He, C, and O ions.
Similar content being viewed by others
References
L. A. Fisk and G. Gloeckler, Space Sci. Rev. 130, 153 (2007).
R. von Steiger, N. A. Schwadron, L. A. Fisk, J. Geiss, et al., J. Geophys. Res. A 105, 27217 (2000).
G. Gloeckler and J. Geiss, Space Sci. Rev. 130, 139 (2007).
G. M. Mason, R. A. Leske, M. I. Desai, C. M. S. Cohen, et al., Astrophys. J. 678, 1458 (2008).
S. W. Kahler, A. J. Tylka, and D. V. Reames, Astrophys. J. 701, 561 (2009).
M. I. Desai, G. M. Mason, J. E. Mazur, and J. R. Dwyer, Astrophys. J. 645, L81 (2006).
M. I. Desai, G. M. Mason, R. E. Gold, S. M. Krimigis, et al., Astrophys. J. 649, 470 (2006).
M. I. Desai, M. A. Dayeh, and G. M. Mason, in Shock Waves in Space and Astrophysical Environments, AIP Conf. Proc. 1183, 11 (2009).
M. A. Dayeh, M. I. Desai, J. R. Dwyer, H. K. Rassoul, G. M. Mason, and J. E. Mazur, Astrophys. J. 693, 1588 (2009).
M. A. Zel’dovich, Yu. I. Logachev, and G. M. Surova, Astron. Rep. 55, 374 (2011).
M. A. Zeldovich, K. Kecskemety, and Yu. I. Logachev, Solar Phys. 293, 3 (2018).
U. Feldman and K. G. Widing, Astrophys. J. 414, 381 (1993).
M. N. Gnevyshev, Solar Phys. 1, 107 (1967).
Yu. I. Logachev, G. A. Bazilevskaya, E. V. Vashenyuk, E. I. Daibog, et al., Catalog of Solar Proton Events in the 23rd Cycle of Solar Activity (1996–2008) (Geofiz. Tsentr RAN, Moscow, 2015) [in Russian].
U. Feldman, Space Sci. Rev. 85, 227 (1998).
Acknowledgments
The experimental data on the fluxes of charged particles obtained by the ULEIS instrument on board the ACE spacecraft were obtained on the site http://www.srl.caltech.edu/ACE/ASC/level2/lvl2DATA_ULEIS.html.
Author information
Authors and Affiliations
Corresponding authors
Additional information
Russian Text © The Author(s), 2019, published in Astronomicheskii Zhurnal, 2019, Vol. 96, No. 6, pp. 523–528.
Rights and permissions
About this article
Cite this article
Zel’dovich, M.A., Logachev, Y.I. & Kecskeméty, K. Time Variations in the Fluxes of Suprathermal Ions and Their Relative Abundances at 1 AU during 1998–2017. Astron. Rep. 63, 508–513 (2019). https://doi.org/10.1134/S1063772919060076
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1063772919060076