FIP effect for minor heavy solar wind ions as seen with SOHO/CELIAS/MTOF

Heidrich-Meisner, Verena; Berger, Lars; Wimmer-Schweingruber, Robert F.; Wurz, Peter; Bochsler, Peter; Ipavich, Fred M.; Paquette, John A.; Klecker, Bernd (2016). FIP effect for minor heavy solar wind ions as seen with SOHO/CELIAS/MTOF. In: VIII International Conference on “Times of polymers and composites": From Aerospace to Nanotechnology. Naples, Italy. 10.1063/1.4943815

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A recent paper [Shearer et al., 2014] reported that during solar maximum Ne showed a surprisingly low abundance. This leads to the question whether other elements show the same behavior. The good mass resolution of Mass-Time-Of-Flight (MTOF) as part of the Charge ELement and Isotope Analysis System (CELIAS) on the Solar Helioshperic Observatory (SOHO) allows to investigate the composition of heavy minor elements in different types of solar wind. We restrict this study to slow solar wind, where the characterisation of slow solar wind is taken from Xu and Borovsky, 2014. This classification scheme requires magnet field information. Since SOHO does not carry a magnetometer, we use the Magnetometer (MAG) of the Advanced Composition Explorer (ACE) instead. The Solar Wind Ion Composition Spectrometer (ACE/SWICS) also provides composition data for cross-calibration and charge-state distributions as input for the transmission function of MTOF whenever the two spacecraft can be expected to observe the same type of wind. We illustrate the MTOF’s capability to determine the solar wind abundance compared to the photospheric abundance (called the FIP ratio in the following) for rare elements like Ti or Cr on long-time scales as a proof of concept for our analysis. And in this brief study, measurements with both ACE/SWICS indicate that the observed elements exhibit a (weak) dependence on the solar cycle, whereas the MTOF measurements are inconclusive.

Item Type:

Conference or Workshop Item (Paper)


08 Faculty of Science > Other Institutions > Emeriti, Faculty of Science
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences

UniBE Contributor:

Wurz, Peter, Bochsler, Peter


500 Science > 520 Astronomy
500 Science > 530 Physics
600 Technology > 620 Engineering




Katharina Weyeneth-Moser

Date Deposited:

18 Jul 2017 10:07

Last Modified:

05 Dec 2022 15:03

Publisher DOI:


Additional Information:

AIP Conference Proceedings




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