These data files contain 12-min resolution solar wind
proton flow velocity (GSE, RTN and GSM components), scalar speed, density,
and (radial component of) temperature, plus the alpha particle to proton
density ratio. The data are typically from the SWEPAM instrument. But
because SWEPAM has reduced sensitivity at the lowest energies, and at
times underestimates the proton density, especially for very slow wind,
proton density is sometimes culled from low-speed (.LT. ~350 km/s)
intervals in the SWEPAM Level 2 data, and proton temperature may also
be culled. More rarely, the solar wind velocity may also be culled,
especially during periods of both high solar energetic particle
background and high wind speeds. In these cases, SWICS-determined
proton density and temperature, and possibly also flow speed (not
velocity vectors), are included in the data records, with a flag to
indicate whether, and which, SWICS parameters are in the records.
As of July, 2012, data were available to the end of 2009.