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FPI tags its data with a variety of quality flags to indicate intervals that need special consideration -- and perhaps correction -- when using for event analysis. It is important to check these and address any noted features. Many of the features below are automatically flagged in the L2 data. See child page on L2 quality flags for detailed information and for contributions of plotting routines to quickly plot them.
Instrumentation Thresholds vs the
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ambient plasma distribution
Significant (>25%) cold plasma (<10eV) component
Significant (>25%) hot plasma (>30keV) component
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Know and use the statistical error information provided in the CDF files. The error associated with the inherent spectrometer counting statistics is provided in the CDF files for both the moments and for the distributions. The actual counts can be recovered from the distErr variable from C = (f/distErr)**2 with distErr from the dist CDFs.
FPI moment error calulations
Quasi-neutrality Check
Comparison of the FPI ion and electron density moments can give some indication as to how much of the underlying plasma distribution is represented in the separate FPI, HPCA, EIS, FEEPS data files.
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