HDPWS

Rosetta - LAP - parameters from sweeps (ASW)

ResourceID
spase://CNES/NumericalData/CDPP-AMDA/Rosetta/LAP/ros-lap-asw

Description
Time series of sweep-based estimates of electron density, ion bulk speed, electron temperature, and photoelectron knee potential. Timestamps represent the middle of the corresponding sweeps. This is a preliminary data set which will be replaced by another in a few months.

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Details

Version:2.4.1

NumericalData

ResourceID
spase://CNES/NumericalData/CDPP-AMDA/Rosetta/LAP/ros-lap-asw
ResourceHeader
ResourceName
Rosetta - LAP - parameters from sweeps (ASW)
AlternateName
Analyzed sweeps (ASW). Miscellaneous physical high-level quantities derived from individual sweeps.
ReleaseDate
2019-08-29 13:24:49Z
Description
Time series of sweep-based estimates of electron density, ion bulk speed, electron temperature, and photoelectron knee potential. Timestamps represent the middle of the corresponding sweeps. This is a preliminary data set which will be replaced by another in a few months.
Contacts
Role Person StartDate StopDate Note
1. PrincipalInvestigator spase://CNES/Person/CDPP-AMDA/Anders.Eriksson
2. DataProducer spase://CNES/Person/CDPP-AMDA/Erik.Johansson

InformationURL
InformationURL
InformationURL
Name
RPC-LAP to Planetary Science Archive Interface Control Document
URL
InformationURL
Name
RPC-LAP Report on cross-calibration of LAP data to measurements by other RPC instruments
URL
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDPP/AMDA HAPI Server
URL
Style
HAPI
ProductKey
ros-lap-asw
Description
Web Service to this product using the HAPI interface.
Format
CSV
Acknowledgement
Thank you for acknowledging the use of AMDA in publications with wording like "Data analysis was performed with the AMDA science analysis system provided by the Centre de Données de la Physique des Plasmas (CDPP) supported by CNRS, CNES, Observatoire de Paris and Université Paul Sabatier, Toulouse". See the Rules of the road at https://amda.cdpp.eu/help/policy.html . Please acknowledge the Data Providers.
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDPP/AMDA Web application
URL
Description
Access to Data via CDPP/AMDA Web application.
Format
CSV
Format
VOTable
Format
CDF
Format
PNG
Acknowledgement
Thank you for acknowledging the use of AMDA in publications with wording like "Data analysis was performed with the AMDA science analysis system provided by the Centre de Données de la Physique des Plasmas (CDPP) supported by CNRS, CNES, Observatoire de Paris and Université Paul Sabatier, Toulouse". See the Rules of the road at https://amda.cdpp.eu/help/policy.html . Please acknowledge the Data Providers.
ProviderName
PSA
ProviderResourceName
RO-C-RPCLAP-5-xxx-DERIV2-V1.0
InstrumentIDs
MeasurementType
ThermalPlasma
TemporalDescription
TimeSpan
StartDate
2014-03-24 08:13:00Z
StopDate
2016-09-28 23:55:32Z
CadenceMin
PT0.016S
CadenceMax
PT128S
Caveats
* n_e_fix_t - electron density is calculated from the slope of the probe curve where electron collection dominates, which should be proportional to the plasma density divided by the square root of the electron temperature [Eriksson et al., 2017]. An electron temperature is assumed to be fixed (value of 5 eV) which has been found suitable for giving densities comparable to MIP at the points where both instruments have data. A user who wishes to use another fixed Te, or use the sweep derived T_E, may scale N_E by the square root of Te/(5 eV). While N_E works well in low density plasmas, severe underestimation can result in high density plasmas where Vsc becomes very negative. * i_ph0_s - photosaturation current derived from individual sweep (LAP1). As LAP1 has shown no significant contamination effects, these estimates should be directly proportional to the EUV flux at Rosetta position in the 20-130 nm band. * v_ion_eff_xcal - effective ion speed derived from individual sweep (speed; always non-negative scalar), while assuming a specific ion mass. Cross-calibrated with RPCMIP. * t_e - electron temperature derived from exponential part of sweep. The temperature from the exponential slope of the retarding electron current (a least-square fit slope of the logarithm of the current, after subtraction of a fitted ion current) refers to the warm electron population. If the automatic identification of the retarding electron current region is poor, this estimate can be quite noisy and have a large random spread. * t_e_xcal - electron temperature, derived by using the linear part of the electron current of the sweep, and density measurement from RPCMIP. The interpretation should be that when T_E_XCAL has a value below 1 eV, there is a cold electron population present. As the relative fractions of the warm and cold electrons are unknown, the provided value of T_E_XCAL should be interpreted as an upper limit to the temperature of the cold electrons. * It should be noted that the absolute accuracy of the two Te estimates is not well constrained as there is little independent data to compare to. T_E_XCAL should be seen as an approximate upper value for the cold electron temperature, while T_E should not be considered to estimate the warm electron temperature better than by a factor of two. * v+ph_knee - spacecraft potential derived from the voltage where the photoelectron emission current from the probe transits from being constant at lower votages to decaying with increasing voltage, clearly visible as a knee. Quality Flag : A quality flag is a (base 10) integer that is constructed in the two steps below: * Add together the constants associated with the relevant quality-related effects listed below. Note that these constants are chosen such that every digit represents up to three true/false values for the presence/absence of three specific separate quality-related effects. * Should the three quality-related effects be irrelevant for the given data product, then that digit is replaced by the digit “9”. Quality flag event description : * +1 - Low quality sweep analysis model fit * +2 - One of two meanings: (1) Low sample size; an average is based on fewer data points than nominal (due to filtering or otherwise) and applies to sweep steps and downsampled time series. (2) zero-padding; zeros replace lost samples for the purpose of calculating PSD. * +10 - One of two meanings: (1) Sweep data product and data products based on sweeps: SAA rotation of more than 0.05° during sweep. (2) Downsampled time series data product: Bias change within the 32 s downsampling period. * +20 - Probe in partial or full shadow * +100 - Rosetta wheel off-loading (WOL) or Orbit-control-maneuver (OCM) * +200 - One of two meanings: (1) For LAP1: LDL disturbance (LAP2 in LDL mode); (2) For LAP2: Contamination signature possibly present * +400 - Saturation Example: suppose that one encounters the quality flag “109”. 109 = 100 + 9 means (1) that there is an ongoing wheel off-loading (+100), and (2) that the quality-related effects associated with +1 and +2 cannot occur even in principle for the kind of data that one is looking at.
Parameter #1
Name
n_e_fix_t
ParameterKey
ros_lap_neft
Description
Electron density derived from individual sweep. An electron temperature is assumed to be fixed (value of 5 eV)
Units
cm^-3
RenderingHints
DisplayType
TimeSeries
FillValue
-1.e+09
Particle
ParticleType
Electron
ParticleQuantity
NumberDensity
Parameter #2
Name
n_e_fix_t : qual
ParameterKey
ros_lap_neft_q
Description
Quality value in the range 0 (worst) to 1 (best). Corresponds to goodness of fit or how well the model fits the data
RenderingHints
DisplayType
TimeSeries
Support
SupportQuantity
Other
Parameter #3
Name
t_e
ParameterKey
ros_lap_te
Description
Electron temperature derived from exponential part of sweep
Units
eV
RenderingHints
DisplayType
TimeSeries
FillValue
-1.e+09
Particle
ParticleType
Electron
ParticleQuantity
Temperature
Parameter #4
Name
t_e : qual
ParameterKey
ros_lap_te_q
Description
Quality value in the range 0 (worst) to 1 (best). Corresponds to goodness of fit or how well the model fits the data
RenderingHints
DisplayType
TimeSeries
Support
SupportQuantity
Other
Parameter #5
Name
t_e_xcal
ParameterKey
ros_lap_te_xcalc
Description
Electron temperature, derived by using the linear part of the electron current of the sweep, and density measurement from RPCMIP.
Units
eV
RenderingHints
DisplayType
TimeSeries
FillValue
-1.e+09
Particle
ParticleType
Electron
ParticleQuantity
Temperature
Parameter #6
Name
t_e_xcal : qual
ParameterKey
ros_lap_te_xcalc_q
Description
Quality value in the range 0 (worst) to 1 (best). Corresponds to goodness of fit or how well the model fits the data
RenderingHints
DisplayType
TimeSeries
Support
SupportQuantity
Other
Parameter #7
Name
i_ph0_s
ParameterKey
ros_lap_ipho
Description
Photosaturation current derived from individual sweep. As LAP1 has shown no significant contamination effects, these estimates should be directly proportional to the EUV flux at Rosetta position in the 20-130 nm band.
Units
A
RenderingHints
DisplayType
TimeSeries
FillValue
-1.e+09
Support
SupportQuantity
Other
Parameter #8
Name
i_ph0_s : qual
ParameterKey
ros_lap_ipho_q
Description
Quality value in the range 0 (worst) to 1 (best). Corresponds to goodness of fit or how well the model fits the data
RenderingHints
DisplayType
TimeSeries
Support
SupportQuantity
Other
Parameter #9
Name
v_ion_eff_xcal
ParameterKey
ros_lap_vi_asw
Description
Effective ion speed derived from individual sweep (speed; always non-negative scalar), while assuming a specific ion mass. Cross-calibrated with RPCMIP
Units
m/s
RenderingHints
DisplayType
TimeSeries
FillValue
-1.e+09
Particle
ParticleType
Ion
ParticleQuantity
Velocity
Parameter #10
Name
v_ion_eff_xcal : qual
ParameterKey
ros_lap_vi_asw_q
Description
Quality value in the range 0 (worst) to 1 (best). Corresponds to goodness of fit or how well the model fits the data
RenderingHints
DisplayType
TimeSeries
Support
SupportQuantity
Other
Parameter #11
Name
v_ph_knee
ParameterKey
ros_lap_usc_asw
Description
Photoelectron knee potential
Units
V
RenderingHints
DisplayType
TimeSeries
FillValue
-1.e+09
Support
SupportQuantity
Other
Parameter #12
Name
v_ph_knee : qual
ParameterKey
ros_lap_usc_asw_q
Description
Quality value in the range 0 (worst) to 1 (best). Corresponds to goodness of fit or how well the model fits the data
RenderingHints
DisplayType
TimeSeries
Support
SupportQuantity
Other
Parameter #13
Name
quality flag
ParameterKey
ros_lap_asw_f
Description
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)
RenderingHints
DisplayType
TimeSeries
Support
SupportQuantity
Other