Academic literature on the topic 'Galactic cosmic ray modulation'

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Journal articles on the topic "Galactic cosmic ray modulation"

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Starodubtsev, Sergei. "Shape of spectrum of galactic cosmic ray intensity fluctuations." Solar-Terrestrial Physics 8, no. 2 (2022): 71–75. http://dx.doi.org/10.12737/stp-82202211.

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The impact of solar wind plasma on fluxes of galactic cosmic rays (CR) penetrating from the outside into the heliosphere with energies above ~1 GeV leads to temporal variations in the CR intensity in a wide frequency range. Cosmic rays being charged particles, their modulation occurs mainly under impacts of the interplanetary magnetic field.
 It is well known that the observed spectrum of interplanetary magnetic field (IMF) fluctuations in a wide frequency range ν from ~10–7 to ~10 Hz has a pronounced falling character and consists of three sections: energy, inertial, and dissipative. Eac
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Florinski, V., W. I. Axford, and G. P. Zank. "The Cosmic Ray Increases At 35 and 60 Kyr BP." Radiocarbon 46, no. 2 (2004): 683–90. http://dx.doi.org/10.1017/s0033822200035736.

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Concentrations of 10Be in ice cores and marine sediments exhibit 2 peaks with significant enhancements at 35,000 and 60,000 BP. This radioisotope is produced in the upper atmosphere by spallation of cosmic-ray protons and secondary neutrons on atmospheric nitrogen and oxygen. Previously suggested explanations for the increases include geomagnetic field reversals, a decrease in solar activity, and a supernova explosion. We propose an alternative explanation which involves a change in the galactic environment of the solar system. The structure of the heliosphere is investigated for a period when
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Agarwal, R., and R. Mishra. "Galactic Cosmic Ray Modulation Up to Recent Solar Cycles." Latvian Journal of Physics and Technical Sciences 48, no. 4 (2011): 66–70. http://dx.doi.org/10.2478/v10047-011-0029-2.

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Galactic Cosmic Ray Modulation Up to Recent Solar Cycles Cosmic ray neutron monitor counts obtained by different ground-based detectors have been used to study the galactic cosmic ray modulation during the last four solar activity cycles. Since long, systematic correlative studies have been per-formed to establish a significant relationship between the cosmic ray intensity and different helio-spheric activity parameters, and the study is extended to a recent solar cycle (23). In the present work, the yearly average of 10.7 cm solar radio flux and the interplanetary magnetic field strength (IMF
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Guo, X., and V. Florinski. "GALACTIC COSMIC-RAY MODULATION NEAR THE HELIOPAUSE." Astrophysical Journal 793, no. 1 (2014): 18. http://dx.doi.org/10.1088/0004-637x/793/1/18.

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Ahluwalia, H. S. "IMF intensity and galactic cosmic ray modulation." Advances in Space Research 29, no. 3 (2002): 439–44. http://dx.doi.org/10.1016/s0273-1177(01)00609-3.

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Li, Jung-Tsung, John F. Beacom, and Annika H. G. Peter. "Galactic Cosmic-Ray Propagation in the Inner Heliosphere: Improved Force-field Model." Astrophysical Journal 937, no. 1 (2022): 27. http://dx.doi.org/10.3847/1538-4357/ac8cf3.

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Abstract A key goal of heliophysics is to understand how cosmic rays propagate in the solar system’s complex, dynamic environment. One observable is solar modulation, i.e., how the flux and spectrum of cosmic rays change as they propagate inward. We construct an improved force-field model, taking advantage of new measurements of magnetic power spectral density by Parker Solar Probe to predict solar modulation within the Earth’s orbit. We find that modulation of cosmic rays between the Earth and Sun is modest, at least at solar minimum and in the ecliptic plane. Our results agree much better wi
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Langner, U. W., and M. S. Potgieter. "Effects of the solar wind termination shock and heliosheath on theheliospheric modulation of galactic and anomalous Helium." Annales Geophysicae 22, no. 8 (2004): 3063–72. http://dx.doi.org/10.5194/angeo-22-3063-2004.

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Abstract. The interest in the role of the solar wind termination shock and heliosheath in cosmic ray modulation studies has increased significantly as the Voyager 1 and 2 spacecraft approach the estimated position of the solar wind termination shock. The effect of the solar wind termination shock on charge-sign dependent modulation, as is experienced by galactic cosmic ray Helium (He++) and anomalous Helium (He+), is the main topic of this work, and is complementary to the previous work on protons, anti-protons, electrons, and positrons. The modulation of galactic and anomalous Helium is studi
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Rodgers-Lee, D., A. A. Vidotto, A. M. Taylor, P. B. Rimmer, and T. P. Downes. "The Galactic cosmic ray intensity at the evolving Earth and young exoplanets." Monthly Notices of the Royal Astronomical Society 499, no. 2 (2020): 2124–37. http://dx.doi.org/10.1093/mnras/staa2737.

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ABSTRACT Cosmic rays may have contributed to the start of life on the Earth. Here, we investigate the evolution of the Galactic cosmic ray spectrum at the Earth from ages t = 0.6−6.0 Gyr. We use a 1D cosmic ray transport model and a 1.5D stellar wind model to derive the evolving wind properties of a solar-type star. At $t=1\,$ Gyr, approximately when life is thought to have begun on the Earth, we find that the intensity of ∼GeV Galactic cosmic rays would have been ∼10 times smaller than the present-day value. At lower kinetic energies, Galactic cosmic ray modulation would have been even more s
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Gololobov, Peter, Prokopy Krivoshapkin, Germogen Krymsky, and Sardaana Gerasimova. "INVESTIGATING THE INFLUENCE OF GEOMETRY OF THE HELIOSPHERIC NEUTRAL CURRENT SHEET AND SOLAR ACTIVITY ON MODULATION OF GALACTIC COSMIC RAYS WITH A METHOD OF MAIN COMPONENTS." Solar-Terrestrial Physics 6, no. 1 (2020): 24–28. http://dx.doi.org/10.12737/stp-61202002.

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The work studies the cumulative modulating effect of the geometry of the interplanetary magnetic field's neutral current sheet and solar activity on propagation of galactic cosmic rays in the heliosphere. The role of each factor on the modulation of cosmic rays is estimated using a method of main components. The application of the method to experimental data on solar activity, to the tilt angle of the neutral sheet, and cosmic ray intensity for a long period from 1980 to 2018 allows us to reveal the temporal dynamics of roles of these factors in the modulation. The modulation character is show
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Buchvarova, M., and P. Velinov. "Cosmic ray spectra in planetary atmospheres." Proceedings of the International Astronomical Union 4, S257 (2008): 471–73. http://dx.doi.org/10.1017/s1743921309029718.

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AbstractOur model generalizes the differential D(E) and integral D(>E) spectra of cosmic rays (CR) during the 11-year solar cycle. The empirical model takes into account galactic (GCR) and anomalous cosmic rays (ACR) heliospheric modulation by four coefficients. The calculated integral spectra in the outer planets are on the basis of mean gradients: for GCR – 3%/AU and 7%/AU for anomalous protons. The obtained integral proton spectra are compared with experimental data, the CRÈME96 model for the Earth and theoretical results of 2D stochastic model. The proposed analytical model gives practi
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Dissertations / Theses on the topic "Galactic cosmic ray modulation"

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Gieseler, Jan [Verfasser]. "Understanding Galactic Cosmic Ray Modulation: Observations and Theory / Jan Gieseler." Kiel : Universitätsbibliothek Kiel, 2018. http://d-nb.info/1155760816/34.

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Vos, Etienne Eben. "Cosmic ray modulation processes in the heliosphere / Vos E.E." Thesis, North-West University, 2011. http://hdl.handle.net/10394/7266.

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The solar minimum of 2009 has been identified as an exceptional event with regard to cosmic ray (CR)modulation, since conditions in the heliosphere have reached unprecedented quiet levels. This unique minimum has been observed by the Earth–orbiting satellite, PAMELA, launched in June, 2006, from which vast sets of accurate proton and electron preliminary observations have been made available. These simultaneous measurements from PAMELA provide the ideal opportunity to conduct an in–depth study of CR modulation, in particular charge–sign dependent modulation. In utilizing this opportunity, a th
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Nndanganeni, Rendani Rejoyce. "Modelling of galactic cosmic ray electrons in the heliosphere / Nndanganeni, R.R." Thesis, North-West University, 2012. http://hdl.handle.net/10394/7034.

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The Voyager 1 spacecraft is now about 25 AU beyond the heliospheric termination shock and soon it should encounter the outer boundary of the heliosphere, the heliopause. This is set to be at 120 AU in the modulation model used for this study. This implies that Voyager 1, and soon afterwards also Voyager 2, should be able to measure the heliopause spectrum, to be interpreted as the lowest possible local interstellar spectrum, for low energy galactic electrons (1 MeV to 120 MeV). This could give an answer to a long outstanding question about the spectral shape (energy dependence) of the galactic
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Minnie, Jaco. "An ab initio approach to the heliospheric modulation of galactic cosmic rays / Jaco Minnie." Thesis, North-West University, 2006. http://hdl.handle.net/10394/1258.

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In the present study we aim to further our understanding of charged particle transport in a magnetized medium. To this end, we perform direct numerical simulations of particle transport in a turbulent magnetic field. From the particle trajectories we calculate diffusion and drift coefficients. In contrast to previous numerical simulations of this nature, we also consider a background magnetic field that contains a gradient perpendicular to the magnetic field direction. By using a non-uniform background magnetic field, we can investigate the simultaneous large scale drift due to the gradient in
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Nkosi, Godfrey Sibusiso. "A study of cosmic ray anisotropies in the heliosphere / Godfrey Sibusiso Nkosi." Thesis, North-West University, 2006. http://hdl.handle.net/10394/1627.

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Ndiitwani, Dzivhuluwani Christopher. "A study of the time-dependent modulation of galactic cosmic rays in the heliosphere / Dzivhuluwani C. Ndiitwani." Thesis, North-West University, 2005. http://hdl.handle.net/10394/843.

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Time-dependent cosmic ray modulation in the heliosphere is studied by using a two-dimensional time dependent modulation model. To compute realistic cosmic ray modulation a compound approach is used, which combines the effect of the global changes in the heliospheric magnetic field magnitude and the current sheet tilt angle to establish realistic time dependent diffusion and drift coefficients. This approach is refined by scaling down drifts additionally (compared to diffusion) towards solar maximum. The amount of drifts needed in the model to realistically compute 2.5 GV proton and electron an
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LENNI, ALEX. "Study of cosmic-ray proton and deuteron solar modulation and its relevence for indirect dark-matter searches with the PAMELA and GAPS experiments." Doctoral thesis, Università degli Studi di Trieste, 2022. http://hdl.handle.net/11368/3014975.

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Cosmic rays (CRs) are electrically charged particles accelerated by astrophysical powerful sources. CRs consists mainly of protons and helium nuclei and in minimal part of other nuclei and electrons. Among these, there are the deuterons, i.e. the deuterium nuclei, which are produced as a secondary component from interactions of CRs with the interstellar medium. During their voyage in the Galaxy, CRs experience energy losses, fragmentations in secondary products, trajectory deflections by galactic magnetic fields and generally a change of the spectral features. Before reaching the Earth, CRs p
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Giesen, Gaelle. "Dark Matter Indirect Detection with charged cosmic rays." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112160/document.

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Les preuves pour l'existence de la matière noire (MN), sous forme d'une particule inconnue qui rempli les halos galactiques, sont issues d'observations astrophysiques et cosmologiques: son effet gravitationnel est visible dans les rotations des galaxies, des amas de galaxies et dans la formation des grandes structures de l'univers. Une manifestation non-gravitationnelle de sa présence n'a pas encore été découverte. L'une des techniques les plus prometteuse est la détection indirecte de la MN, consistant à identifier des excès dans les flux de rayons cosmiques pouvant provenir de l'annihilation
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RECCHIA, SARAH. "Non linear cosmic ray transport and cosmic ray driven galactic winds." Doctoral thesis, Gran Sasso Science Institute, 2016. http://hdl.handle.net/20.500.12571/13501.

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The bulk of Cosmic Rays (CRs) reaching our planet is likely of Galactic origin and is thought to be accelerated in sources located in the Galactic disk (mainly Supernova remnants (SNRs)). The energy density of Galactic CRs, ∼ 1 eV/cm3, can be accounted for if one assumes that 3-10% of the mechanical energy injected by SNe in the Galaxy is channeled into accelerated particles. The observed large residence time of CRs in the Galaxy (compared to the time required for ballistic propagation of relativistic particles on Galactic distances) suggests that Galactic CRs are well coupled to the interste
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CELLI, SILVIA. "Gamma-ray and neutrino signatures of Galactic cosmic-ray accelerators." Doctoral thesis, Gran Sasso Science Institute, 2019. http://hdl.handle.net/20.500.12571/10141.

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Supernova remnants are believed to be the major contributors to the observed Galactic cosmic-ray flux, though indisputable observational pieces of evidence of such statement are still missing. A crucial aspect of the supernova remnant paradigm for the origin of Galactic comic rays is that particle acceleration, as due to diffusive shock acceleration, requires effective confinement of particles in the shock region to let them achieve energies up to the so-called knee, around ∼ 10^15-10^16 eV. However, the current theoretical description of cosmic-ray acceleration and propagation within and ar
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Books on the topic "Galactic cosmic ray modulation"

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S, Potgieter M., COSPAR Scientific Assembly, and COSPAR Scientific Commission D, eds. Heliospheric cosmic ray transport, modulation and turbulence. Published for the Committee on Space Research [by] Elsevier, 2005.

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Celli, Silvia. Gamma-ray and Neutrino Signatures of Galactic Cosmic-ray Accelerators. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-33124-5.

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W, Townsend Lawrence, and Langley Research Center, eds. A benchmark for galactic cosmic ray transport codes. Langley Research Center, 1987.

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United States. National Aeronautics and Space Administration., ed. Cosmic x-ray physics. National Aeronautics and Space Administration, 1992.

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1940-, Wilson John W., and United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., eds. An efficient HZETRN: (a galactic cosmic ray transport code). National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1992.

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W, Wilson J., and Langley Research Center, eds. Galactic and solar cosmic ray shielding in deep space. National Aeronautics and Space Administration, Langley Research Center, 1997.

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W, Wilson J., Badavi F. F, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., eds. Semiempirical fragmentation models on galactic cosmic ray transport calculations with hydrogen target. National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1993.

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United States. National Aeronautics and Space Administration., ed. Observations of gamma-ray bursts. National Aeronautics and Space Administration, 1995.

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United States. National Aeronautics and Space Administration., ed. Observations of gamma-ray bursts. National Aeronautics and Space Administration, 1995.

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United States. National Aeronautics and Space Administration., ed. Observations of gamma-ray bursts. National Aeronautics and Space Administration, 1995.

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Book chapters on the topic "Galactic cosmic ray modulation"

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Toptygin, I. N. "Modulation of Galactic Cosmic Rays." In Cosmic Rays in Interplanetary Magnetic Fields. Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5257-7_5.

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Perko, John S. "Solar-Cycle Modulation of Galactic Cosmic Rays." In Genesis and Propagation of Cosmic Rays. Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-4025-3_20.

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Heber, B., and R. A. Burger. "Modulation of Galactic Cosmic Rays at Solar Minimum." In Space Sciences Series of ISSI. Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-017-1179-1_10.

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McKibben, R. B. "Modulation of Galactic Cosmic Rays in the Heliosphere." In Astrophysics and Space Science Library. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4612-5_44.

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Potgieter, M. S. "The Modulation of Galactic Cosmic Rays in the Heliosphere: Theory and Models." In Cosmic Rays in the Heliosphere. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-1189-0_13.

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Simpson, J. A. "A Brief History of Recurrent Solar Modulation of the Galactic Cosmic Rays (1937–1990)." In Cosmic Rays in the Heliosphere. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-1189-0_15.

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Simpson, J. A. "Recurrent Solar Modulation of the Galactic Cosmic Rays and the Anomalous Nuclear Component in Three Dimensions of the Heliosphere." In Cosmic Rays in the Heliosphere. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-1189-0_2.

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Kalegaev, V. V., D. E. Karmanov, A. A. Kurganov, et al. "Space Project “Modulation”, a New Approach to Studying the Fluxes of Galactic Cosmic Rays in the Field of Solar Modulation Energies." In Springer Proceedings in Earth and Environmental Sciences. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-50248-4_9.

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Schlickeiser, Reinhard. "Galactic Cosmic Rays." In Cosmic Ray Astrophysics. Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-04814-6_17.

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Grenier, Isabelle A. "Galactic Gamma-Ray Sources." In Cosmic Gamma-Ray Sources. Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2256-2_3.

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Conference papers on the topic "Galactic cosmic ray modulation"

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De Mitri, Ivan, and Irene Cagnoli. "Galactic cosmic ray studies with DAMPE." In 12th Neutrino Oscillation Workshop. Sissa Medialab, 2025. https://doi.org/10.22323/1.473.0077.

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Munini, Riccardo. "SOLAR MODULATION OF GALACTIC-COSMIC RAY ANTIPROTONS." In 37th International Cosmic Ray Conference. Sissa Medialab, 2021. http://dx.doi.org/10.22323/1.395.1328.

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Song, Xiaojian. "Study Galactic Cosmic Ray Modulation with AMS-02 observation." In 37th International Cosmic Ray Conference. Sissa Medialab, 2021. http://dx.doi.org/10.22323/1.395.1354.

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Miyake, Shoko, Yotaro Migita, Yoichi Asaoka, et al. "Solar Modulation of Galactic Cosmic-Ray Electrons Measured with CALET." In 36th International Cosmic Ray Conference. Sissa Medialab, 2019. http://dx.doi.org/10.22323/1.358.1126.

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Potgieter, Marthinus, and Rendani Nndanganeni. "The combined modulation of Jovian and Galactic electrons in the heliosphere." In 35th International Cosmic Ray Conference. Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.301.0043.

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Gil, Agnieszka, Eleanna Asvestari, Gennady Kovaltsov, and Ilya Usoskin. "Heliospheric modulation of galactic cosmic rays: Effective energy of ground-based detectors." In 35th International Cosmic Ray Conference. Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.301.0032.

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Ndiitwani, Dzivhuluwani, Donald Ngobeni, O. P. M. ASlam, et al. "A simulation study of galactic proton modulation from solar minimum to maximum conditions." In 37th International Cosmic Ray Conference. Sissa Medialab, 2021. http://dx.doi.org/10.22323/1.395.1327.

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Ngobeni, Mabedle Donald, Opm Aslam, Marius S. Potgieter, et al. "Modeling the modulation of galactic protons in two successive very quiet solar minima." In 38th International Cosmic Ray Conference. Sissa Medialab, 2023. http://dx.doi.org/10.22323/1.444.1236.

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Nuntiyakul, Waraporn, Paul Evenson, David Ruffolo, et al. "Latitude survey investigation of galactic cosmic ray solar modulation during 1994-2007." In The 34th International Cosmic Ray Conference. Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.236.0067.

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Chowdhury, Partha, Karel Kudela, and Y. J. Moon. "Heliospheric modulation and periodicities of galactic cosmic rays during 21-24 solar cycles." In The 34th International Cosmic Ray Conference. Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.236.0198.

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Reports on the topic "Galactic cosmic ray modulation"

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Reedy, R. C., and J. Masarik. Production profiles of nuclides by galactic-cosmic-ray particles in small meteoroids. Office of Scientific and Technical Information (OSTI), 1994. http://dx.doi.org/10.2172/10165756.

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Cliver, E. W., I. G. Richardson, and A. G. Ling. Solar Drivers of 11-yr and Long-Term Cosmic Ray Modulation (PostPrint). Defense Technical Information Center, 2012. http://dx.doi.org/10.21236/ada561709.

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