Propagation of particles injected from interplanetary shocks: A black box model and its consequences for acceleration theory and data interpretation

Research output: Journal contributionsJournal articlesResearchpeer-review

Authors

  • May Britt Kallenrode
  • Gerd Wibberenz
Energetic protons in the hundreds of keV to the tens of MeV range frequently are observed in connection with traveling interplanetary shocks. Occasionally, the particle energies can extend up to about 100 MeV. The intensity time profiles at the observer's site are a superposition of the continuous, spatially and temporally variable acceleration at the shock and the subsequent interplanetary propagation. To gain a better understanding of both processes and to derive their relevant parameters, we extend a numerical solution of the model of focused transport to accommodate the shock as a moving source. No assumptions about the acceleration mechanism are made; the shock is treated as a black box. In this paper we introduce the model, discuss its validity, and present model results which have implications for acceleration theory and data interpretation. The main results concerning acceleration and propagation are as follows: (1) In the limit of strong scattering and low particle speeds our model converges toward diffusive shock acceleration. (2) For weak scattering or fast particles, spatial diffusion is an insufficient approximation for particle transport; in this case, the physical consequence is a fast escape from the shock, and the formal consequence is that the standard description of diffusive shock acceleration is insufficient. (3) Because of this fast escape, even a turbulent foreshock region, while it is perfectly capable of keeping 100 keV protons confined to the shock, would allow 10 MeV protons to stream away easily. Important results for data interpretation are as follows: (1) A quasi-exponential intensity increase upstream of the shock is not necessarily indicative of diffusive shock acceleration. (2) The intensity at the time of shock passage is a crude measure for the local acceleration efficiency as long as it stays constant or continues to rise. Copyright 1997 by the American Geophysical Union.
Original languageEnglish
Article number97JA01677
JournalJournal of Geophysical Research A: Space Physics
Volume102
Issue numberA10
Pages (from-to)22311-22334
Number of pages24
ISSN0148-0227
DOIs
Publication statusPublished - 01.10.1997

DOI

Recently viewed

Researchers

  1. Jürgen Maskow

Activities

  1. Forum for Linguistic Studies (Fachzeitschrift)
  2. Michael Rosens Where Broccoli Comes From: Vorlesung in der Reihe "10 Minuten Lyrik"
  3. The apparent simplicity of children’s literature and its implications for foreign language teaching and learning (International AILA Literature in Language Learning and Teaching Network Conference, Universität Erfurt)
  4. Adito CRM Strategie-Event - 2019
  5. Preventing the collapse of sensemaking in organizations: On legitimizing digital innovations in established organizations
  6. Senat (Organisation)
  7. Workshops zur Qualitätssicherung in den Projekten der Qualitätsoffensive Lehrerbildung
  8. Mobile Language Learning und Gamification – Good and Bad Recipes for Chocolate Coated Broccoli
  9. Conference on Centres of Irish Studies 2020
  10. International Astronautical Federation (IAF) (Externe Organisation)
  11. Konferenz :The Public Sector in Transition 2004
  12. Evaluator of the PhD Thesis of Edgar Ramírez Laboreo and member of the commission of the final examination
  13. Institut für Wirtschaftsinformatik (Organisation)
  14. Heterogenität und Diversität im Horizont von Homogenität
  15. Bsc-Thesis: Community composition of visitors to extrafloral nectaries along a tree diversity gradient in a subtropical Chinese forest.
  16. Tagung "Wisdom and Academic Education" - 2006
  17. Broaden the scope of HE for sustainability – the innovative potential of e-learning
  18. Kom­men­tar zu Eliz­a­beth Loshs Vor­trag zu »Sur­vi­val of Tools/​Su­vir­val­tools«, Trans­me­dia­le: »Pa­nic Room Ses­si­ons: Post-Di­gi­tal An­xie­ty«
  19. Jacobs Universität Bremen (Externe Organisation)
  20. From Fast to Slow Fashion: Management Challenges for the Sustainability Transformation of Business Models
  21. Cognitive predictors of child and adult L2 learning in the earliest stages of aural exposure
  22. ARLE 2019
  23. Leuphana Universität Lüneburg (Organisation)
  24. American Association of Applied Linguistics (AAAL) (Externe Organisation)
  25. Stiftung Internationale Jugendbibliothek (Externe Organisation)
  26. Tag der Leh­re - 2018
  27. Im Horizont verheddert. Krazy Kat