Effects of corotating interaction regions on Ulysses high energy particles

Journal Article · Sat Jul 20 04:00:00 EDT 1996 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.51503· OSTI ID:21163517

Droege, W; Kunow, H; Heber, B; Mueller-Mellin, R; Sierks, H; Wibberenz, G; Raviart, A; Ducros, R; Ferrando, P; Rastoin, C; Paizis, C; Gosling, J T ^[1]

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1. Institut fuer Kernphysik, Universitaet Kiel, 24118 Kiel (Germany)

We investigate the intensity variation of low energy ({approx}6-23 MeV/N) heliospheric ions and of galactic protons (250-2200 MeV) observed by the Kiel Electron Telescope onboard the Ulysses spacecraft associated with Corotating Interaction Regions (CIR) from mid-1992 to end of June 1995. This period covers Ulysses' transit to high southern latitudes, the south polar pass, return to the solar equator and ascent to the north pole up to 70 deg. We find that the flux of high energy protons exhibits a periodicity of about 26 days with a relative intensity variation of 10%. At latitudes below {approx}50 deg. the recurrent variations of galactic protons are in coincidence with the passage of CIRs and enhancements of low energies protons and alpha particles which are accelerated at the shocks of the CIRs. The modulation of galactic protons is observed up to high southern latitudes, where the signatures of a CIR are no longer visible in plasma or magnetic field data. The periodicity does not depend on latitude and its phase apparently remains constant during Ulysses' pass over the south pole as well as through the solar equator.

• OSTI ID: 21163517
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 382; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALPHA PARTICLES
ASTROPHYSICS
ELECTRONS
IONS
MAGNETIC FIELDS
MEV RANGE
MODULATION
PERIODICITY
PLASMA
PROTONS
TELESCOPE COUNTERS