Jena 2013 – scientific programme
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EP: Fachverband Extraterrestrische Physik
EP 4: Poster Session
EP 4.28: Poster
Tuesday, February 26, 2013, 11:15–12:45, Poster OG
High Time Resolution Measurements of Solar Wind Heavy Ions with SOHO/CELIAS/CTOF — •Nils Janitzek1, Andreas Taut1, Lars Berger1, Peter Bochsler2, Christian Drews1, Berndt Klecker3, and Robert F. Wimmer-Schweingruber1 — 1Christian-Albrechts-Universität Kiel — 2Universität Bern — 3MPE Garching
The Charge Time-Of-Flight (CTOF) mass spectrometer as one of the three main sensors of the Charge, ELement and Isotope Analysis System (CELIAS) onboard the SOlar and Heliospheric Observatory (SOHO) is designed to measure the kinetic properties and elemental/ionic composition of solar wind ions heavier than H+, which we refer to as heavy ions. This is achieved by measuring the E/q-ratio, the time-of-flight and the energy deposit of incident ions. While CTOF was able to measure data only for a short time period from DOY 80 1996 until DOY 230 1996 due to an instrument failure, the measured data shows a remarkable time-of-flight resolution compared to similar instruments such as SWICS on ACE. In addition the CTOF measurement cycle of about 5 minutes allows the investigation of short-time variations of the solar wind composition. We performed an in-flight calibration of the CTOF sensor which includes the determination of both time-of-flight range and energy deposit range of the measured ion species at fixed E/q-ratios. The results of our calibration will allow us to infer the composition and spectra of solar wind heavy ions with high time resolution.