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Some Phase 1A FPI L2 DES/DIS v 3.1.0 fast survey moments (des-moms and dis-moms) inadvertently did not include optimal spacecraft potential correction. These data have been replaced (as of 15Nov2016) and are designated as v. 3.1.1 files. The dates of the affected moments files are:
- 2016-01-01 - 2016-01-12
- 2016-02-01 - 2016-02-15
- 2016-03-01 - 2016-03-08
Known Limitations to be addressed in future data release
GSE-Referenced Directional Spectrograms: The data for the six directional spectrogram variables in the FPI DES/DIS v3.1.0 burst and fast survey moments files (des-moms and dis-moms) do not match their respective VAR_NOTES descriptions nor do they match the data standard released with the v2.1 CDF files. The issue is "plasma flow" direction versus "detector look" direction; that is, the VAR_NOTES descriptions and the FPI data standard set with v2.1 dictate flow direction, while the v3.1 spectrograms are detector look direction with respect to GSE. In order to maintain consistency with FPI v.2.1 you may switch the _px (plus x) variable with that labeled _mx (minus x), _py with _my, and _pz with _mz, where px indicates the plus GSE x direction, mx indicates the minus GSE x direction and similiarly for py, my, pz, mz. This applies for Release 3.1.z only. These are less frequently used variables and will be corrected in release (v3.2). We thank Ali Varsani for bringing this to our attention. The affected variables are:
- energyspectr_px
- energyspectr_mx
- energyspectr_py
- energyspectr_my
- energyspectr_pz
- energyspectr_mz
Note that the pitch-angle distributions (*_pitchangdist_*) are not similarly affected.
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