Galactic and anomalous cosmic rays during the recent solar minimum

J. Kóta, J. R. Jokipii

Research output: Contribution to conferencePaperpeer-review

Abstract

The recent unusually long solar minimum offers a unique insight into the physics of cosmic ray modulation. The magnetic field was weakest ever recorded, and the flux of galactic cosmic rays (GCRs) reached a record high level. Anomalous cosmic ray (ACR) fluxes, on the other hand, did nor exceed their 1987 level. We interpret these observations in terms of enhanced diffusion in the weaker field. The source spectrum of ACRs at the termination shock depends on the diffusion coefficient inside the TS: adiabatic cooling results in a steeper source spectrum of ACRs at the TS if the diffusion into the heliosphere is easier. 1-D and 2-D model simulations will be presented and preliminary results will be compared with observational evidence.

Original languageEnglish (US)
Pages11-13
Number of pages3
DOIs
StatePublished - Jan 1 2011
Event32nd International Cosmic Ray Conference, ICRC 2011 - Beijing, China
Duration: Aug 11 2011Aug 18 2011

Other

Other32nd International Cosmic Ray Conference, ICRC 2011
CountryChina
CityBeijing
Period8/11/118/18/11

Keywords

  • Galactic and anomalous cosmic rays
  • Recent solar minimum
  • Solar modulation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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