urn:nasa:pds:context:instrument:pvmp.bus.bnms 1.0 1.20.0.0 Product_Context 2023-12-11 1.0 Initial creation of the Multiprobe context products urn:nasa:pds:context:instrument_host:spacecraft.pvmp.bus instrument_to_instrument_host 10.1109/TGRS.1980.350294 von Zahn, U., et al., The Pioneer Venus bus neutral gas mass spectrometer, IEEE Trans. Geosci. Rem. Sens., GE-18, No. 1, 122-125, doi:10.1109/TGRS.1980.350294, Jan. 1980. reference.VONZAHNETAL_1980 PIONEER VENUS PROBE BUS NEUTRAL MASS SPECTROMETER Spectrometer not applicable not applicable INSTRUMENT OVERVIEW =================== This neutral particle mass spectrometer experiment obtained measurements which provided information on the origin and evolution of Venus' atmosphere, the present energy balance and dynamics of the upper atmosphere, and the interaction of the upper atmosphere with solar radiation and the interplanetary medium. A magnetic deflection, double-focusing mass spectrometer was flown to measure the upper atmosphere neutral molecules in the mass range 1 to 46 atomic mass units (u).