Browsing Faculty of Natural and Agricultural Sciences by Subject "Convection"

Now showing items 1-5 of 5

    • Jovian electrons in the inner heliosphere: proposing a new source spectrum based on 30 years of measurements 

      Vogt, A.; Kopp, A.; Potgieter, M.S.; Strauss, R.D.; Heber, B. (EDP Sciences, 2018)
      Context. Since the Pioneer 10 flyby of Jupiter it has become well known that electrons of Jovian origin dominate the lower MeV range of charged energetic particles in the inner heliosphere. Aims. Because the Jovian source ...

    • Latitudinal gradients of galactic cosmic rays during the 2007 solar minimum 

      Heber, B.; Potgieter, M.S.; Ferreira, S.E.S.; Gieseler, J.; Dunzlaff, P. (IOP Publishing, 2008)
      Ulysses, launched in 1990 October in the maximum phase of solar cycle 22, completed its third out-of-ecliptic orbit in 2008 February. This provides a unique opportunity to study the propagation of cosmic rays over a wide ...

    • Magnetospheric electric field variations caused by storm-time shock fronts 

      Kokorowski, M.; Moraal, H.; Stoker, P.H.; Bering, E.A.; Ruohoniemi, M. (Elsevier, 2008)
      On January 20, 2005 there was an X 7.1 solar flare at 0636 UT with an accompanied halo coronal mass ejection (CME). The resultant interplanetary shock impacted earth ∼36 h later. Near earth, the Advanced Composition Explorer ...

    • Particle transport within the pulsar wind nebula HESS J1825–137 

      Abdalla, H.; Arcaro, C.; Backes, M.; Barnard, M.; Böttcher, M.; Chand, T.; Chandra, S.; Ndiyavala, H.; Schutte, H.; Seyffert, A.S.; Van der Walt, D.J.; Van Rensburg, C.; Venter, C.; Wadiasingh, Z.; Zacharias, M.; H.E.S.S. Collaboration (EDP Sciences, 2019)
      Context. We present a detailed view of the pulsar wind nebula (PWN) HESS J1825–137. We aim to constrain the mechanisms dominating the particle transport within the nebula, accounting for its anomalously large size and ...

    • Spectral analysis and interpretation of the Y-ray emission from the starburst galaxy NGC 253 

      Abramowski, A.; Büsching, I.; Casanova, S.; Pekeur, N.W.; Sheidaei, F.; Venter, C.; Vorster, M.; H.E.S.S. Collaboration (IOP Publishing, 2012)
      Very high energy (VHE; E ≥ 100 GeV) and high-energy (HE; 100 MeV ≤ E ≤ 100 GeV) data from γ-ray observations performed with the H.E.S.S. telescope array and the Fermi-LAT instrument, respectively, are analyzed in order to ...