Effects of corotating interaction regions on Ulysses high energy particles

Journal Article · Mon Jul 01 04:00:00 EDT 1996 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.51503· OSTI ID:575572

Droege, W; Kunow, H; Heber, B; Mueller-Mellin, R; Sierks, H; Wibberenz, G ^[1]; Raviart, A; Ducros, R; Ferrando, P; Rastoin, C ^[2]; Paizis, C ^[3]; Gosling, J T ^[4]

---

1. Institut fuer Kernphysik, Universitaet Kiel, 24118 Kiel (Germany)
2. CEA, DSM/DAPNIA/Service dAstrophysique, C.E. Saclay, 91191 Gif-sur-Yvette (France)
3. Instituto Fisica Cosmica CNR, Universita di Milano, 20133 Milano (Italy)
4. Los Alamos National Laboratory, Los Alamos New Mexico 87545 (United States)

We investigate the intensity variation of low energy ({approximately}6{endash}23MeV/N) heliospheric ions and of galactic protons (250{endash}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{close_quote} transit to high southern latitudes, the south polar pass, return to the solar equator and ascent to the north pole up to 70{degree}. We find that the flux of high energy protons exhibits a periodicity of about 26 days with a relative intensity variation of 10{percent}. At latitudes below {approximately}50{degree} 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{close_quote} pass over the south pole as well as through the solar equator. {copyright} {ital 1996 American Institute of Physics.}

• OSTI ID: 575572
• Report Number(s): CONF-9506256--
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 382; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COSMIC RAY FLUX
LATITUDE EFFECT
MEV RANGE
SHOCK WAVES
SOLAR WIND
VARIATIONS