2.2.6 spase://CDPP/NumericalData/AMDA/Rosetta/LAP/ros-lap-pho photosaturation current (PHO) Photosaturation current derived collectively from multiple sweeps 2016-10-15T14:08:29Z There are two estimates of the photoemission current from LAP1 sweeps of a sunlit probe. I_PH0 in PHO files is a statistical estimate from several sweeps (over 60 minute windows), while I_PHO in the ASW files is an estimate from a single sweep with larger uncertainties but higher time resolution (usually 160 s). As LAP1 has shown no significant contamination effects, these estimates should be directly proportional to the EUV flux at the Rosetta position in the 20-130 nm band [Johansson et al, 2017]. For LAP2, the same techniques have revealed a lower photoemission at the start of the cometary phase of the emission, and a sharp drop in photoemission after significant thruster firings (e.g. dayside excursion, 60% decrease) with sporadic recoveries and relapses. We therefore only use LAP1 based values. While there is no other source of photoemission measurements than LAP, its value is controlled by solar EUV radiation which is known from e.g. TIMED and SDO at Earth and MAVEN at Mars. Photoemission values by both methods were presented by Johansson et al. [2017] and compared to Earth and Mars data. The two methods were found to give consistent results, also in agreement with a third independent method immune to instrument offsets. However, around perihelion all methods returned about 50% less photoemission than expected from the Earth and Mars EUV fluxes. This may be a real effect, for example because of attenuation of solar EUV radiation by large numbers of small dust grains at large distance from the nucleus. It is also possible that this somehow relates to probe surface contamination, though no other such effects have been noted on LAP1 spase://CDPP/Person/Anders.Eriksson PrincipalInvestigator spase://CDPP/Person/Erik.Johansson DataProducer RPC LAP User Guide http://amda.irap.omp.eu/help/parameters/RO-IRFU-LAP-UG.PDF ROSETTA RPC-LAP to Planetary Science Archive Interface Control Document http://amda.irap.omp.eu/help/parameters/RO-IRFU-LAP-EAICD_2_0_1_PDF_A.PDF spase://SMWG/Repository/CDPP/AMDA Online Restricted http://amda.cdpp.eu NetCDF PSA RO-C-RPCLAP-5-xxx-DERIV2-V1.0 spase://CDPP/Instrument/AMDA/Rosetta/LAP ThermalPlasma 2014-03-24T08:12:59Z 2016-09-30T10:31:16Z PT60S i_pho ros_lap_pho Photosaturation current derived collectively from multiple sweeps a TimeSeries quality value ros_lap_pho_q Quality value in the range 0 (worst) to 1 (best). Corresponds to goodness of fit or how well the model fits the data. TimeSeries data source ros_lap_usc_s TimeSeries quality flag ros_lap_pho_f Quality flag constructed as the sum of multiple terms, depending on what quality related effects are present. Each digit is either in the range 0 (best) to 7 (worst), or 9 (not used) TimeSeries