All data were processed at NASA/Goddard Space Flight Center 
using custom programmed software. The software is available.
The data represent a reduction to physical units (density, flux) 
and were processed from an intermediate engineering unit file 
(current, count/sec etc.). Unit and 1/8 unit amu sweeps are not 
contained in the processed data sets but are available from the 
engineering unit data set. The engineering unit data is converted 
to ambient values using spacecraft velocity and attitude, the 
theoretical expected system response, and the corresponding 
calibration factors. Superthermal ion data for species other 
than O+ is available in engineering unit form.
 
DATA SET NAME    TYPE   ORBIT RANGE  DATE RANGE          PROCESSED
Neutral density LORES      3 - 640  12/07/78 - 09/05/80  12/13/88
Neutral density LORES   4961 - 5055 07/06/92 - 10/07/92  06/01/93
Neutral density HIRES      3 - 640  12/07/78 - 09/05/80  12/13/88
Neutral density HIRES   4961 - 5055 07/06/92 - 10/07/92  06/01/93
Superthermal O+ LORES      1 - 4468 12/07/78 - 11/21/90  01/06/92
Superthermal O+ LORES   4494 - 4975 03/27/91 - 07/20/92  01/06/92
Superthermal O+ HIRES      1 - 2780 12/05/78 - 07/16/90  01/06/92
Superthermal O+ HIRES   3415 - 4368 04/12/88 - 11/21/91
Superthermal O+ HIRES   4494 - 4975 03/27/91 - 07/20/92  01/06/92
Superthermal    MAX        1 - 5055 12/05/78 - 10/07/92  01/06/92
Thermal ion     LORES    466 - 5055 03/15/80 - 09/25/92  06/01/93
 
PVONMS is the software name for all 6 datasets:
   PVO-V-ONMS-5-SUPERTHERMALIONLOC-V1.0
   PVO-V-ONMS-4-NEUTRALDENSITY-12SEC-V1.0
   PVO-V-ONMS-3-NEUTRALDENSITY-HIRES-V1.0
   PVO-V-ONMS-4-SUPERTHRMLOXYGN-12SEC-V1.0
   PVO-V-ONMS-3-SUPERTHRMLOXYGN-HIRES-V1.0
   PVO-V-ONMS-4-IONMAXCOUNTRATE-12SEC-V1.0