Skip to main content
Log in

Energy dependence of the characteristic decay time of proton fluxes in solar cosmic ray events

  • Published:
Cosmic Research Aims and scope Submit manuscript

Abstract

Energetic solar proton events within the energy interval 1–48 MeV at the stage of their decay are considered over the period of 1974–2001. The dependence of the characteristic decay time on the proton energy in the assumed power-law representation τ(E) =E n is analyzed for the events with an exponential decay form. The dependence of n on the heliolongitude of the flare (the particles source on the Sun) is studied.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Similar content being viewed by others

References

  1. Forman, M.A., The Equilibrium Anisotropy in the Flux of 10-MeV Solar Flare Particles and Their Convection in he Solar Wind, J. Geophys. Res., 1970, vol. 75, p. 3147.

    Article  ADS  Google Scholar 

  2. Jokipii, J.R., Propagation of Solar Cosmic Rays in the Solar Wind, in Solar Activity Observations and Predictions, McIntosh, P.S. and Dryer, M., Eds., MIT Press, 1972.

  3. Daibog, E.I., Kahler, S., Keczkeméty, K., and Logachev, Yu.I., Statistical Characteristics of Declines in Particle Fluxes in Solar Proton Events over a Long Period (1974–2001), Izv. Akad. Nauk, 2003, vol. 67, no. 4, p. 482.

    Google Scholar 

  4. Daibog, E.I., Logachev, Yu.I., Kahler, S., and Kecskeméty, K., Statistical Properties of SEP Event Flux Declines, Adv. Space. Res., 2003, vol. 32, p. 2655.

    ADS  Google Scholar 

  5. Kecskeméty, K., Daibog, E.I., Kahler, S., and Logachev, Yu.I., Some Statistical Properties of the Decay Phase of SEP-Events, Proc. 28th ICRC, 2003, p. 3503.

  6. Daibog, E.I., Logachev, Yu.I., Kahler, S., and Keczkeméty, K., Correlations of Characteristics of Time Profiles of Energetic Particle Events on the Phase of Their Decline with Parameters of Interplanetary Medium, Izv. Akad. Nauk, 2005, vol. 69, no. 6, p. 789.

    Google Scholar 

  7. Krimigis, S.M., van Allen, J.A., and Armstrong, T.P., Solar Particle Observations inside the Magnetosphere during the July 7, 1966 Event, Univ. Iowa Rept., 1967, no. 67, p. 50.

  8. Logachev, Yu.I., Doctoral (Phys.-Math.) Dissertation, Moscow, 1969, pp. 274–279.

  9. Paularena, K.I. and King, J.H., NASA’s IMP-8 Spacecraft, Interball in the ISTP Program, Sibeck, D.G. and Kudela, K., Eds., 1999, pp. 145–154.

  10. Reames, D.V., Barbier, L.M., and Ng, C.K., The Spatial Distribution of Particles Accelerated by Coronal Mass Ejection Driven Shocks, Astrophys. J., 1996, vol. 466, p. 473.

    Article  ADS  Google Scholar 

  11. Daibog, E.I., Kahler, S.W., Stolpovskii, V.G., et al., Invariant Spectral Characteristics of the Decay Phases of Energetic Electron Intensities in Solar Particle Events, Adv. Space Res., 2000, vol. 26, p. 871.

    Article  ADS  Google Scholar 

  12. Burlaga, L.F., Anisotropic Diffusion of Solar Cosmic Rays, J. Geophys. Res., 1967, vol. 72, p. 4449.

    Article  ADS  Google Scholar 

  13. Lupton, J.E. and Stone, E.C., Solar Flare Particle Propagation: Comparison of a New Analytic Solution with Spacecraft Measurements, J. Geophys. Res., 1973, vol. 78, p. 1007.

    Article  ADS  Google Scholar 

  14. Lee, M.A., Acceleration of Energetic Particles on the Sun, in the Heliosphere, and in the Galaxy, in Acceleration and Transport of Energetic Particles Observed in the Heliosphere, vol. 528 of AIP Conf. Proc., 2001, p. 3.

  15. Owens, A.J., Interplanetary Diffusion of Solar Cosmic Rays: A New Approximate Analytic Solution, J. Geophys. Res., 1979, vol. 84, no. 8, p. 4451.

    Article  ADS  Google Scholar 

  16. Daibog, E.I., Logachev, Yu.I., and Keczkeméty, K., Characteristics of the Decay Phase of Proton Fluxes in Solar Events as a Function of Observer’s Heliolongitude, Kosm. Issled., 2006, vol. 44, no. 6, pp. 521–526.

    Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Additional information

Original Russian Text © E.I. Daibog, Yu.I. Logachev, K. Kecskemety, 2008, published in Kosmicheskie Issledovaniya, 2008, Vol. 46, No. 1, pp. 37–41.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Daibog, E.I., Logachev, Y.I. & Kecskemety, K. Energy dependence of the characteristic decay time of proton fluxes in solar cosmic ray events. Cosmic Res 46, 35–39 (2008). https://doi.org/10.1134/S001095250801005X

Download citation

  • Received:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1134/S001095250801005X

PACS

Navigation