Würzburg 2018 – scientific programme
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EP: Fachverband Extraterrestrische Physik
EP 11: Sun and Heliosphere III - Particles
EP 11.7: Talk
Thursday, March 22, 2018, 16:45–17:00, BSZ - Pabel HS
Energy spectra of carbon and oxygen with HELIOS E6 - Radial gradients of Anomalous Cosmic Ray oxygen within 1 AU — •J. Marquardt1, B. Heber1, M.S. Potgieter2, and R.D. Strauss2 — 1Christian-Albrechts-Universität zu Kiel, Germany — 2Centre for Space Research, North-West-University, Potchefstroom, 2520, South Africa
HELIOS A and HELIOS B were launched on December 10, 1974 and January 15, 1976, respectively. The two almost identical space probes were sent into ecliptic orbits around the Sun. The Kiel experiment, E6 is one of three particle detectors aboard HELIOS that allows to study the flux of energetic particles in the energy range from 1.3 MeV/nucleon to above 1000 MeV/nucleon for ions and from 0.3 to 8 MeV for electrons. We present here the energy spectra of galactic cosmic ray (GCR) carbon and oxygen, as well as of ACR oxygen during solar quiet time periods between 1975 to 1977, utilizing both HELIOS spacecraft at distances between 0.3 and 1 AU. The radial gradient (Gr≈ 50%/AU) of 9-28.5 MeV ACR oxygen in the inner heliosphere is about three times larger than the one determined between 1 and 10 AU by utilizing the Pioneer 10 measurements.