Abstract
We report on the calcium abundance in the solar wind for an extended time period around the 1996 solar minimum. Data were recorded with the Mass Time-of-Flight (MTOF) sensor of the Charge, Element, and Isotope Analysis System (CELIAS) instrument on the SOHO spacecraft. The Ca/O abundance is 0.017 ± 0.003 for slow solar wind (VSW 500 km s-1). Compared to the photospheric Ca/O abundance ratio of (Ca/O)PS = 0.00421 ± 0.00079, the solar wind clearly shows strong first ionization potential (FIP) fractionation as is expected for a low-FIP element. The Ca/H abundance is ACa = 6.63 ± 0.05 and ACa = 6.21 ± 0.10 for slow and fast solar winds, respectively. For comparison, the photospheric Ca abundance is ACa = 6.36 ± 0.02.
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