Jena 2013 – scientific programme
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EP: Fachverband Extraterrestrische Physik
EP 4: Poster Session
EP 4.26: Poster
Tuesday, February 26, 2013, 11:15–12:45, Poster OG
Investigation of Pickup Ions with SOHO/CELIAS/CTOF — •Andreas Taut1, Nils Janitzek1, Lars Berger1, Peter Bochsler2, Christian Drews1, Berndt Klecker3, and Robert F. Wimmer-Schweingruber1 — 1Institute for Experimental and Applied Physics, Christian-Albrechts-University Kiel, Germany — 2Physikalisches Institut, University of Bern, Switzerland — 3Max Planck Institute for Extraterrestrial Physics, Garching, Germany
The Charge Time Of Flight (CTOF) sensor of the Charge, ELement, and Isotope Analysis System (CELIAS) experiment on SOHO is a time-of-flight mass spectrometer designed to measure the ionic composition of the solar wind. CTOF determines an ion's mass, mass-per-charge and velocity by the combined measurement of energy-per-charge (0.3 keV/e to 35 keV/e), time-of-flight and residual energy. Due to failure of detector components in August 1996, CTOF ceased to operate nominally after 150 days, but partially compensates the relatively small operation time by a signifcantly higher collection power with respect to other time-of-flight mass spectrometers. Thus, CTOF is able to study rare solar wind heavy ions with exceptional statistics. CTOF is especially well suited for the investigation of interstellar and inner-source pickup ions, because of its excellent time-of-flight resolution. Pickup ions are ionized neutral atoms coming from the interstellar medium or a source close to the sun, respectively. We report on first results of our investigation of the abundance and velocity spectra of inner-source and interstellar C+ and O+ pickup ions. Furthermore the in-flight calibration of the instrument is shown.