Cosmic-ray helium intensities over the solar cycle from ACE

G. A. De Nolfo, W. R. Binns, C. M.S. Cohen, A. C. Cummings, A. J. Davis, J. S. George, P. L. Hink, M. H. Israel, K. Lave, R. A. Leske, R. A. Mewaldt, I. V. Moskalenko, R. C. Ogliore, E. C. Stone, T. T. Von Rosenvinge, M. E. Wiedenbeck, N. E. Yanasak

Research output: Contribution to conferencePaper

1 Citation (Scopus)

Abstract

Observations of cosmic-ray helium energy spectra provide important constraints on cosmic ray origin and propagation. However, helium intensities measured at Earth are affected by solar modulation, especially below several GeV/nucleon. Observations of helium intensities over a solar cycle are important for understanding how solar modulation affects galactic cosmic ray intensities and for separating the contributions of anomalous and galactic cosmic rays. The Cosmic Ray Isotope Spectrometer (CRIS) on ACE has been measuring cosmic ray isotopes, including helium, since 1997 with high statistical precision. We present helium elemental intensities between ∼10 to ∼100 MeV/nucleon from the Solar Isotope Spectrometer (SIS) and CRIS observations over a solar cycle and compare these results with the observations from other satellite and balloon-borne instruments, and with GCR transport and solar modulation models.

Original languageEnglish (US)
Pages813-816
Number of pages4
StatePublished - Jan 1 2007
Event30th International Cosmic Ray Conference, ICRC 2007 - Merida, Yucatan, Mexico
Duration: Jul 3 2007Jul 11 2007

Other

Other30th International Cosmic Ray Conference, ICRC 2007
CountryMexico
CityMerida, Yucatan
Period7/3/077/11/07

Fingerprint

solar cycles
cosmic rays
helium
isotopes
spectrometers
modulation
satellite-borne instruments
balloon-borne instruments
gas cooled reactors
helium isotopes
energy spectra
propagation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

De Nolfo, G. A., Binns, W. R., Cohen, C. M. S., Cummings, A. C., Davis, A. J., George, J. S., ... Yanasak, N. E. (2007). Cosmic-ray helium intensities over the solar cycle from ACE. 813-816. Paper presented at 30th International Cosmic Ray Conference, ICRC 2007, Merida, Yucatan, Mexico.

Cosmic-ray helium intensities over the solar cycle from ACE. / De Nolfo, G. A.; Binns, W. R.; Cohen, C. M.S.; Cummings, A. C.; Davis, A. J.; George, J. S.; Hink, P. L.; Israel, M. H.; Lave, K.; Leske, R. A.; Mewaldt, R. A.; Moskalenko, I. V.; Ogliore, R. C.; Stone, E. C.; Von Rosenvinge, T. T.; Wiedenbeck, M. E.; Yanasak, N. E.

2007. 813-816 Paper presented at 30th International Cosmic Ray Conference, ICRC 2007, Merida, Yucatan, Mexico.

Research output: Contribution to conferencePaper

De Nolfo, GA, Binns, WR, Cohen, CMS, Cummings, AC, Davis, AJ, George, JS, Hink, PL, Israel, MH, Lave, K, Leske, RA, Mewaldt, RA, Moskalenko, IV, Ogliore, RC, Stone, EC, Von Rosenvinge, TT, Wiedenbeck, ME & Yanasak, NE 2007, 'Cosmic-ray helium intensities over the solar cycle from ACE', Paper presented at 30th International Cosmic Ray Conference, ICRC 2007, Merida, Yucatan, Mexico, 7/3/07 - 7/11/07 pp. 813-816.
De Nolfo GA, Binns WR, Cohen CMS, Cummings AC, Davis AJ, George JS et al. Cosmic-ray helium intensities over the solar cycle from ACE. 2007. Paper presented at 30th International Cosmic Ray Conference, ICRC 2007, Merida, Yucatan, Mexico.
De Nolfo, G. A. ; Binns, W. R. ; Cohen, C. M.S. ; Cummings, A. C. ; Davis, A. J. ; George, J. S. ; Hink, P. L. ; Israel, M. H. ; Lave, K. ; Leske, R. A. ; Mewaldt, R. A. ; Moskalenko, I. V. ; Ogliore, R. C. ; Stone, E. C. ; Von Rosenvinge, T. T. ; Wiedenbeck, M. E. ; Yanasak, N. E. / Cosmic-ray helium intensities over the solar cycle from ACE. Paper presented at 30th International Cosmic Ray Conference, ICRC 2007, Merida, Yucatan, Mexico.4 p.
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abstract = "Observations of cosmic-ray helium energy spectra provide important constraints on cosmic ray origin and propagation. However, helium intensities measured at Earth are affected by solar modulation, especially below several GeV/nucleon. Observations of helium intensities over a solar cycle are important for understanding how solar modulation affects galactic cosmic ray intensities and for separating the contributions of anomalous and galactic cosmic rays. The Cosmic Ray Isotope Spectrometer (CRIS) on ACE has been measuring cosmic ray isotopes, including helium, since 1997 with high statistical precision. We present helium elemental intensities between ∼10 to ∼100 MeV/nucleon from the Solar Isotope Spectrometer (SIS) and CRIS observations over a solar cycle and compare these results with the observations from other satellite and balloon-borne instruments, and with GCR transport and solar modulation models.",
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AU - De Nolfo, G. A.

AU - Binns, W. R.

AU - Cohen, C. M.S.

AU - Cummings, A. C.

AU - Davis, A. J.

AU - George, J. S.

AU - Hink, P. L.

AU - Israel, M. H.

AU - Lave, K.

AU - Leske, R. A.

AU - Mewaldt, R. A.

AU - Moskalenko, I. V.

AU - Ogliore, R. C.

AU - Stone, E. C.

AU - Von Rosenvinge, T. T.

AU - Wiedenbeck, M. E.

AU - Yanasak, N. E.

PY - 2007/1/1

Y1 - 2007/1/1

N2 - Observations of cosmic-ray helium energy spectra provide important constraints on cosmic ray origin and propagation. However, helium intensities measured at Earth are affected by solar modulation, especially below several GeV/nucleon. Observations of helium intensities over a solar cycle are important for understanding how solar modulation affects galactic cosmic ray intensities and for separating the contributions of anomalous and galactic cosmic rays. The Cosmic Ray Isotope Spectrometer (CRIS) on ACE has been measuring cosmic ray isotopes, including helium, since 1997 with high statistical precision. We present helium elemental intensities between ∼10 to ∼100 MeV/nucleon from the Solar Isotope Spectrometer (SIS) and CRIS observations over a solar cycle and compare these results with the observations from other satellite and balloon-borne instruments, and with GCR transport and solar modulation models.

AB - Observations of cosmic-ray helium energy spectra provide important constraints on cosmic ray origin and propagation. However, helium intensities measured at Earth are affected by solar modulation, especially below several GeV/nucleon. Observations of helium intensities over a solar cycle are important for understanding how solar modulation affects galactic cosmic ray intensities and for separating the contributions of anomalous and galactic cosmic rays. The Cosmic Ray Isotope Spectrometer (CRIS) on ACE has been measuring cosmic ray isotopes, including helium, since 1997 with high statistical precision. We present helium elemental intensities between ∼10 to ∼100 MeV/nucleon from the Solar Isotope Spectrometer (SIS) and CRIS observations over a solar cycle and compare these results with the observations from other satellite and balloon-borne instruments, and with GCR transport and solar modulation models.

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