Дисертації з теми "Cosmic ray modulation"
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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.
Повний текст джерелаThesis (M.Sc. (Physics))--North-West University, Potchefstroom Campus, 2012.
KO, CHUNG-MING. "COSMIC-RAY MODIFIED STELLAR WINDS (ACCELERATION, MODULATION, DIFFUSION, TRANSONIC SOLUTION)." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/183980.
Повний текст джерелаGieseler, Jan [Verfasser]. "Understanding Galactic Cosmic Ray Modulation: Observations and Theory / Jan Gieseler." Kiel : Universitätsbibliothek Kiel, 2018. http://d-nb.info/1155760816/34.
Повний текст джерелаNgobeni, Mabedle Donald. "Aspects of the modulation of cosmic rays in the outer heliosphere / by Mabedle Donald Ngobeni." Thesis, North-West University, 2006. http://hdl.handle.net/10394/97.
Повний текст джерелаThesis (M.Sc. (Physics))--North-West University, Potchefstroom Campus, 2007.
Krüger, Tjaart Petrus Jakobus. "The effect of a Fisk-Parker hybrid magnetic field on cosmic rays in the heliosphere / Tjaart P.J. Krüger." Thesis, North-West University, 2005. http://hdl.handle.net/10394/1205.
Повний текст джерелаThesis (M.Sc. (Physics))--North-West University, Potchefstroom Campus, 2006.
Krüger, Helena. "A calibration neutron monitor for long-term cosmic ray modulation studies / H. Krüger." Thesis, North-West University, 2006. http://hdl.handle.net/10394/1023.
Повний текст джерелаThesis (Ph.D. (Physics))--North-West University, Potchefstroom Campus, 2006.
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.
Повний текст джерелаThesis (M.Sc. (Physics))--North-West University, Potchefstroom Campus, 2012.
Engelbrecht, Nicholas Eugéne. "On the heliospheric diffusion tensor and its effect on 26-day recurrent cosmic-ray variations / N.E. Engelbrecht." Thesis, North-West University, 2008. http://hdl.handle.net/10394/2052.
Повний текст джерелаNkosi, 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.
Повний текст джерелаStrauss, Roelf du Toit. "Modelling of cosmic ray modulation in the heliosphere by stochastic processes / Roelf du Toit Strauss." Thesis, North-West University, 2013. http://hdl.handle.net/10394/10217.
Повний текст джерелаPhD (Space Physics), North-West University, Potchefstroom Campus, 2013
MUNINI, RICCARDO. "Solar modulation of cosmic ray electrons and positrons measured by the PAMELA experiment during the 23rd solar minimum." Doctoral thesis, Università degli Studi di Trieste, 2016. http://hdl.handle.net/11368/2908077.
Повний текст джерелаMikuni, Vinicius Massami. "Measurement of cosmic ray electrons and positrons with the AMS-02 experiment." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-29092017-143310/.
Повний текст джерелаO Alpha Magnetic Spectrometer (AMS-02) é um experimento de física de partículas instalado na Estação Espacial Internacional (ISS) desde Maio de 2011. Desde seu lançamento, AMS-02 coleta uma quantidade de dados com tal precisão que até então nunca foram jamais vistos, abrindo o caminho para o estudo dos Raios Cósmicos (CRs). Os primeiros resultados publicados pelo AMS-021-3 apresentam tensões com o modelo atual da teoria de CRs, particularmente nas altas energias. Essas tensões são diretamente ligadas a diversas questões fundamentais como a natureza da Matéria Escura (DM), a origem dos CRs e suas propagações pela galáxia. Este trabalho apresenta a medição do fluxo de elétrons e pósitrons em CRs primários, baseando-se nos dados coletados entre Maio de 2011 e Novembro de 2016, período extendido com relação aos resultados públicados pelo AMS-02.3 Os resultados extendem o intervalo de energia explorado para 1 TeV para elétrons e 700 GeV ára pósitrons, consistentes com os resultados públicados usando o mesmo período. Discrepância entre a nova medição e o fluxo públicado é observada na região de baixas energias para o fluxo de elétrons, enquanto o fluxo de pósitrons continua em bom acordo. O resultado pode ser explicado por uma dependência na carga causada pela modulação solar. Tal hipótese é investigada estudando-se a evolução temporal dos fluxos, focando-se no intervao de energia abaixo de 40 GeV, onde um fluxo de elétrons e pósitrons é medido durante 74 intervalos temporais de 27 dias, correspondendo à rotação do sol vista da Terra. A análise dependente do tempo confirma a existência da dependência de carga da modulação solar, também observada por outras análises independentes que foram feitas dentro da colaboração.
Engelbrecht, Nicholas Eugéne. "On the development and applications of a three-dimensional ab initio cosmic-ray modulation model / Nicholas Eugéne Engelbrecht." Thesis, North-West University, 2012. http://hdl.handle.net/10394/8735.
Повний текст джерелаThesis (PhD (Physics))--North-West University, Potchefstroom Campus, 2013
Ghelfi, Alexandre. "Analyse des données de l'expérience AMS-02 pour la propagation du rayonnement cosmique dans la cavité solaire et la Galaxie." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAY044/document.
Повний текст джерелаCosmic rays (CR) were discovered by Viktor Hess in 1912. Charged CR are synthesized and supposedly accelerated in supernova remnants, then propagate through the Galaxy. CR flux measurement set constraints on CR sources and propagation, but may also bring answers to the dark matter problem.AMS-02 is a high precision particle physics detector placed on the international space station since may 2011. It measures the CR fluxes of many species.This thesis deals with the proton flux estimation measured by the AMS-02 instrument. The focus is set on the unfolding of the instrument energy response impacting the flux, and on the caracterisation of the high-energy spectral break.The Sun produces a plasma which interacts with CR particles, modifying the flux obtained from galactic propagation. This modification evolves through time following the solar activity cycle, and is denoted solar modulation. In this framework, decolving from this effect, a robust determination of the proton and helium interstellar fluxes is obtained using recent high precision CR data including AMS-02. The associated solar modulation levels are cross-checked with a second estimation taken from neutron monitors (ground based detectors) data, allowing solar modulation time series reconstruction from the 50s
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.
Повний текст джерелаGiesen, Gaelle. "Dark Matter Indirect Detection with charged cosmic rays." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112160/document.
Повний текст джерелаOverwhelming evidence for the existence of Dark Matter (DM), in the form of an unknownparticle filling the galactic halos, originates from many observations in astrophysics and cosmology: its gravitational effects are apparent on galactic rotations, in galaxy clusters and in shaping the large scale structure of the Universe. On the other hand, a non-gravitational manifestation of its presence is yet to be unveiled. One of the most promising techniques is the one of indirect detection, aimed at identifying excesses in cosmic ray fluxes which could possibly be produced by DM annihilations or decays in the Milky Way halo. The current experimental efforts mainly focus in the GeV to TeV energy range, which is also where signals from WIMPs (Weakly Interacting Massive Particles) are expected. Focussing on charged cosmic rays, in particular antiprotons, electrons and positrons, as well as their secondary emissions, an analysis of current and forseen cosmic ray measurements and improvements on astrophysical models are presented. Antiproton data from PAMELA imposes contraints on annihilating and decaying DM which are similar to (or even slightly stronger than) the most stringent bounds from gamma ray experiments, even when kinetic energies below 10 GeV are discarded. However, choosing different sets of astrophysical parameters, in the form of propagation models and halo profiles, allows the contraints to span over one or two orders of magnitude. In order to exploit fully the power of antiprotons to constrain or discover DM, effects which were previously perceived as subleading turn out to be relevant especially for the analysis of the newly released AMS-02 data. In fact, including energy losses, diffusive reaccelleration and solar modulation can somewhat modify the current bounds, even at large DM masses. A wrong interpretation of the data may arise if they are not taken into account. Finally, using the updated proton and helium fluxes just released by the AMS-02 experiment, the astrophysical antiproton to proton ratio and its uncertainties are reevaluated and compared to the preliminarly reported AMS-02 measurements. No unambiguous evidence for a significant excess with respect to expectations is found. Yet, some preference for thicker halos and a flatter energy dependence of the diffusion coefficient starts to emerge. New stringed constraints on DM annihilation and decay are derived. Secondary emissions from electrons and positrons can also be used to constrain DM annihilation or decay in the galactic halo. The radio signal due to synchrotron radiation of electrons and positrons on the galactic magnetic field, gamma rays from bremsstrahlung processes on the galactic gas densities and from Inverse Compton scattering processes on the interstellar radiation field are considered. With several magnetic field configurations, propagation scenarios and improved gas density maps and interstellar radiation field, state-of-art tools allowing the computaion of synchrotron and bremssttrahlung radiation for any WIMP DM model are provided. All numerical results for DM are incorporated in the release of the Poor Particle Physicist Coookbook for DM Indirect Detection (PPPC4DMID). Finally, the possible GeV gamma-ray excess identified in the Fermi-LAT data from the Galactic Center in terms of DM annihilation, either in hadronic or leptonic channels is studied. In order to test this tantalizing interprestation, a multi-messenger approach is used: first, the computation of secondary emisison from DM with respect to previous works confirms it to be relevant for determining the DM spectrum in leptonic channels. Second, limits from antiprotons severely constrain the DM interpretation of the excess in the hadronic channel, for standard assumptions on the Galactic propagation parameters and solar modulation. However, they considerably relax if more conservative choices are adopted
DI, FELICE VALERIA. "Low energy electron and positron measurements in space with the PAMELA experiment." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2010. http://hdl.handle.net/2108/1245.
Повний текст джерелаThis thesis describes the study of electrons and positrons in the cosmic radiation. New measurements of the positron fraction at the top of the atmosphere between 200 MeV and 3.0 GeV are presented, together with the electron spectrum up to 20 GeV. The measurement was conducted with the space borne PAMELA experiment from July 2006 to December 2008, that is a period of minimum solar activity and negative solar magnetic field polarity. PAMELA provides the first long term observation of the low energy positron abundance during this particular solar and heliospheric state. The great amount of collected statistics allows to study the variation of the particle intensity at Earth with energy and time, and to investigate effects depending on the particles sign of charge. During approximately 860 days of data collection about 16300 positrons and 178000 electrons were identified. The major sources of background, constituted by cosmic protons and locally produced pions, have been studied. The derived electron spectrum clearly shows the effect of the solar modulation below few GeV. The detected positron fraction has been found to be in accordance with predictions from theoretical models that describe the transport of particles in the heliosphere taking drift effects into account.
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.
Повний текст джерелаThesis (Ph.D. (Physics))--North-West University, Potchefstroom Campus, 2006.
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.
Повний текст джерелаThesis (M.Sc. (Physics))--North-West University, Potchefstroom Campus, 2005.
Magidimisha, Edwin. "A study of the time-dependent modulation of cosmic rays in the inner heliosphere / E. Magidimisha." Thesis, North-West University, 2010. http://hdl.handle.net/10394/4402.
Повний текст джерелаThesis (M.Sc. (Space Physics))--North-West University, Potchefstroom Campus, 2011.
Manuel, Rex. "Time-dependent modulation of cosmic rays in the outer heliosphere / Rex Manuel." Thesis, North-West University, 2013. http://hdl.handle.net/10394/8740.
Повний текст джерелаThesis (PhD (Space Physics))--North-West University, Potchefstroom Campus, 2013
Langner, Ulrich Wilhelm. "Effects of termination shock acceleration on cosmic rays in the heliosphere / U.W. Langner." Thesis, North-West University, 2004. http://hdl.handle.net/10394/346.
Повний текст джерелаThesis (Ph.D. (Physics))--North-West University, Potchefstroom Campus, 2004.
Baker, Christopher Paul. "Cosmic ray modulation in the heliosphere." Thesis, 1993. https://eprints.utas.edu.au/18946/1/whole_BakerChristopherPaul1993_thesis.pdf.
Повний текст джерелаRaath, Jan Louis. "A comparative study of cosmic ray modulation models / Jan Louis Raath." Thesis, 2015. http://hdl.handle.net/10394/15516.
Повний текст джерелаMSc (Space Physics), North-West University, Potchefstroom Campus, 2015
Hall, DL. "Modulation of high energy cosmic rays in the heliosphere." Thesis, 1995. https://eprints.utas.edu.au/19632/7/whole_HallDamianLindsay1995.pdf.
Повний текст джерелаNgobeni, Mabedle Donald. "Modeling of galactic cosmic rays in the heliosphere / Mabedle Donald Ngobeni." Thesis, 2015. http://hdl.handle.net/10394/15476.
Повний текст джерелаPhD (Space Physics), North-West University, Potchefstroom Campus, 2015