Now showing items 2820-2839 of 18238

    • Cosmic ray modulation processes in the heliosphere 

      Vos, Etienne Eben (North-West University, 2011)
      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 ...
    • Cosmic ray modulation with a Fisk-type heliospheric magnetic field and a latitude-dependent solar wind speed 

      Hitge, Mariette; Burger, Renier A (Elsevier Science Limited, 2009)
    • Cosmic rays in astrospheres 

      Scherer, K.; Van der Schyff, A.; Ferreira, S.E.S.; Strauss, R.D.; Bomans, D.J. (EDP Sciences, 2015)
      Context: Cosmic rays passing through large astrospheres can be efficiently cooled inside these “cavities” in the interstellar medium. Moreover, the energy spectra of these energetic particles are already modulated in front ...
    • Cosmic rays in the dynamic heliosheath 

      Potgieter, Marthinus S; Ferreira, Stephanus E S (Elsevier, 2008)
    • Cosmic rays in the dynamic heliosphere 

      Potgieter, Marthinus S (Elsevier, 2009)
    • Cosmic rays in the inner heliosphere: insights from observations, theory and models 

      Potgieter, Marthinus Steenkamp (Springer, 2011)
      The global modulation of galactic cosmic rays in the inner heliosphere is determined by four major mechanisms: convection, diffusion, particle drifts (gradient, curvature and current sheet drifts), and adiabatic energy ...
    • The cosmic-ray ground-level enhancement of 1989 September 29 

      Moraal, H.; Cabellero-Lopez, R.A. (IOP Publishing, 2014)
      The ground-level enhancement (GLE) of 1989 September 29 is one of the largest of 71 solar energetic particle events observed by neutron monitors on Earth. It was smaller than the record-breaking GLE 5 of 1956 February 23, ...
    • Cosmic-ray modulation equations 

      Moraal, Harm (Springer, 2011)
      The temporal variation of the cosmic-ray intensity in the heliosphere is called cosmic-ray modulation. The main periodicity is the response to the 11-year solar activity cycle. Other variations include a 27-day solar ...
    • Cosmic-ray modulation: an ab initio approach 

      Engelbrecht, N.E.; Burger, R.A. (Springer Verlag, 2014)
      A better understanding of cosmic-ray modulation in the heliosphere can only be gained through a proper understanding of the effects of turbulence on the diffusion and drift of cosmic rays. We present an ab initio model ...
    • A cosmic-ray positron anisotropy due to two middle-aged, nearby pulsars? 

      Büsching, I.; De Jager, O.C.; Potgieter, M.S.; Venter, C. (IOP Publishing, 2008)
      Geminga and B0656+14 are the closest pulsars with characteristic ages in the range of 100 kyr to 1 Myr. They both have spin-down powers of the order 3 × 1034 ergs s–1 at present. The winds of these pulsars had most probably ...
    • A Cosmic-ray Positron Anisotropy due to Two Middle-Aged,Nearby Pulsars? 

      Potgieter, Marthinus S; De Jager, Ocker C; Venter, Christo; Büsching, I (IOP Publishing Limited, 2008)
    • Cosmic-ray positrons from millisecond pulsars 

      Venter, C.; Kopp, A.; Büsching, I.; Harding, A.K.; Gonthier, P.L. (American Astronomical Society, 2015)
      Observations by the Fermi Large Area Telescope of γ-ray millisecond pulsar (MSP) light curves imply copious pair production in their magnetospheres, and not exclusively in those of younger pulsars. Such pair cascades may ...
    • Cosmic-ray yield and response functions in the atmosphere 

      Caballero-Lopez, R.A.; Moraal, H. (American Geophysical Union, 2012)
      Since the middle 1950s, neutron monitors have provided a continuous record of the intensity of secondary atmospheric particles produced by the primary cosmic radiation above the atmosphere. The number of counts due to ...
    • Cosmologies of the ancient Mediterranean world 

      Fitzgerald, John T. (OASIS, 2013)
      Cosmology is concerned with the order of the universe and seeks to provide an account, not only of that order, but also of the mind or reason behind it. In antiquity, the cosmos was usually understood religiously, such ...
    • Cosmology in the book of Revelation 

      Jordaan, Gert J.C. (OASIS, 2013)
      The cosmology of the book of Revelation mainly involves God’s restored reign over the created universe (κόσμος). Throughout the book, the κόσμος is depicted according to its constituent parts, namely heaven, sea and ...
    • Cosmos, reality and God in the letters of John 

      Van der Watt, Jan (OASIS, 2013)
      The major question addressed in this article is how reality, especially cosmic reality, is perceived in 1 John; in other words: What are the elements of John’s cosmological vision as it becomes apparent in his letters? ...
    • Cost and time effective DSM on mine compressed air systems 

      Joubert, Hercules Phillipus Roedolf (North-West University, 2010)
      Implementing demand side management (DSM) is expensive and often time consuming. Eskom grants subsidies for DSM projects based on the proposed savings. The subsidy granted is not always adequate to fund all the required control ...
    • A cost benefit analysis in chronic medicine courier pharmacies : a case study 

      Beyers, Christiaan Frederick (2013)
      The South African pharmaceutical market is seen as part of the so called "pharmerging" markets, together with countries like India, China and Brazil. These "pharmerging" markets are the fastest growing markets within the ...
    • Cost benefit analysis of outsourcing initiatives/strategy at water utilities corporation (Botswana) 

      Mogomotsi, G (2016-01-11)
      After the Water Utilities Corporation adopted outsourcing as a policy initiative and operational directive various non-core functions were outsourced. This raises obvious questions as to why the Corporation suddenly ...
    • Cost effective control of a platinum mine cooling system using combined DSM strategies 

      Engles, Jonathan Scott (North-West University (South Africa) , Potchefstroom Campus, 2015)
      The platinum mining industry in South Africa faces various challenges. Increasing labour and energy costs as well as dropping commodity prices threaten the sustainability of the industry. Reducing energy usage and cost ...