Quiet time fluxes and radial gradients of low-energy protons in the inner and outer heliosphere

K. Kecskeméty, M. A. Zeldovich, Yu I. Logachev, B. Heber, P. Király, R. A. Mewaldt, A. Posner, J. Rodriguez-Pacheco

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Radial variations of low-energy (∼1-8 MeV) quiet-time fluxes of protons are examined at distances of 20-85 AU during low solar activity periods using Voyager 1-2 data and compared with Ulysses fluxes at 1-5 AU as well as IMP-8 and SOHO at Earth and Helios between 0.3 and 1 AU. To obtain nearly background-free fluxes, the data are based on a careful pulse-height analysis. Except for high solar activity periods, contaminated with solar particles, all fluxes are very low, of the order of, and below 10-5 /(cm2 s sr MeV). The Ulysses fluxes seem to be the lowest, whereas Helios and Voyager fluxes are nearly at the same level. The radial variation in 1-8 MeV suggests a negative gradient from 0.5 to about 2 AU that gradually turns positive beyond 2 AU. Whereas the true variation is difficult to infer between 5 and 17 AU due to solar contribution, from 30 to about 60 AU it exhibits a wide plateau, beyond which a slight increasing tendency is observed. At energies above ∼6 MeV a clear contribution of anomalous hydrogen is observed.

Original languageEnglish
Title of host publication29th International Cosmic Ray Conference, ICRC 2005
PublisherTata Institute of Fundamental Research
Pages57-60
Number of pages4
Volume2
Publication statusPublished - 2005
Event29th International Cosmic Ray Conference, ICRC 2005 - Pune, India
Duration: Aug 3 2005Aug 10 2005

Other

Other29th International Cosmic Ray Conference, ICRC 2005
CountryIndia
CityPune
Period8/3/058/10/05

Fingerprint

heliosphere
proton energy
gradients
solar activity
Explorer 50 satellite
pulse amplitude
plateaus
tendencies
protons
energy
hydrogen

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Kecskeméty, K., Zeldovich, M. A., Logachev, Y. I., Heber, B., Király, P., Mewaldt, R. A., ... Rodriguez-Pacheco, J. (2005). Quiet time fluxes and radial gradients of low-energy protons in the inner and outer heliosphere. In 29th International Cosmic Ray Conference, ICRC 2005 (Vol. 2, pp. 57-60). Tata Institute of Fundamental Research.

Quiet time fluxes and radial gradients of low-energy protons in the inner and outer heliosphere. / Kecskeméty, K.; Zeldovich, M. A.; Logachev, Yu I.; Heber, B.; Király, P.; Mewaldt, R. A.; Posner, A.; Rodriguez-Pacheco, J.

29th International Cosmic Ray Conference, ICRC 2005. Vol. 2 Tata Institute of Fundamental Research, 2005. p. 57-60.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Kecskeméty, K, Zeldovich, MA, Logachev, YI, Heber, B, Király, P, Mewaldt, RA, Posner, A & Rodriguez-Pacheco, J 2005, Quiet time fluxes and radial gradients of low-energy protons in the inner and outer heliosphere. in 29th International Cosmic Ray Conference, ICRC 2005. vol. 2, Tata Institute of Fundamental Research, pp. 57-60, 29th International Cosmic Ray Conference, ICRC 2005, Pune, India, 8/3/05.
Kecskeméty K, Zeldovich MA, Logachev YI, Heber B, Király P, Mewaldt RA et al. Quiet time fluxes and radial gradients of low-energy protons in the inner and outer heliosphere. In 29th International Cosmic Ray Conference, ICRC 2005. Vol. 2. Tata Institute of Fundamental Research. 2005. p. 57-60
Kecskeméty, K. ; Zeldovich, M. A. ; Logachev, Yu I. ; Heber, B. ; Király, P. ; Mewaldt, R. A. ; Posner, A. ; Rodriguez-Pacheco, J. / Quiet time fluxes and radial gradients of low-energy protons in the inner and outer heliosphere. 29th International Cosmic Ray Conference, ICRC 2005. Vol. 2 Tata Institute of Fundamental Research, 2005. pp. 57-60
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AU - Heber, B.

AU - Király, P.

AU - Mewaldt, R. A.

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AU - Rodriguez-Pacheco, J.

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