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Did this question ever get a more detailed answer about how one would use this data? For example, the atec and stec fields are sometimes negative where as TEC is positive. Is that due to a per site bias that needs to be calibrated? The scale of the tec fields are different by about 3 orders of magni...

The ionosphere prediction data for 5/30 that I would expect to be here: https://cddis.nasa.gov/archive/gnss/products/ionex/2025/150/c2pg1500.25i.Z is not present. That two day prediction data would usually have been available a day ago, but the 150 directory doesn't exist as of Fri May 30 06:17:16 U...