NSSDCA ID: PSSB-02854
Availability: Archived at NSSDC, accessible from elsewhere
This description was generated automatically using input from the Planetary Data System.
Data Set Overview ================= Contents: A. Operations overview B. Data set status C. Scientific use D. Caveats A. Operations overview ---------------------LAP operations are described in the operations report, IRFU-ROS-OPR-EXT3 in the DOCUMENT/FLIGHT_REPORTS directory of this data set. B. Data set status -----------------This data set contains scientifically useful data from the Rosetta RPC-LAP instrument. The data contained are primary instrument data, calibrated to physical units (volts and amperes) and with instrumental offsets removed. See the caveats in Section D below for data use. C. Scientific use ----------------The data can be used for scientific analysis, but this requires some familiarity with this type of data. There are also separate derived-level data sets for the same time period, providing directly useful scientific quantities (e.g. electron density, wave spectra, electron temperature). For information on exact data products (science data, geometry files, housekeeping), calibration, file formats and file naming conventions, etc., consult the EAICD, RO-IRFU-LAP-EAICD, in the DOCUMENT directory. For the specifics of this mission phase, see the operations report, IRFU-ROS-OPR-EXT3 in the DOCUMENT/FLIGHT_REPORTS directory. D. Caveats ---------This section covers caveats relevant for this specific data set. For general caveats, see the EAICD in the DOCUMENT directory. D.1. General caveat ------------------The archived data set is complete, but it has not been possible to scan every part of it for every possible problem before delivery, so there may be numerous data quality issues in addition to this list. While the data clearly have a great science potential, analysis has to be done with great care. Anybody using the present data set is strongly encouraged to contact a LAP CoI for cooperation. D.2. Macros x710 and 0x910 use shifting sampling frequencies -----------------------------------------------------------Users should be aware that 0x710 and 0x910 differ from all other macros in that the sampling of LF fix-bias data is done at two different sampling frequencies during the macro repetition cycle. The two macros were constructed for Rosetta's final descent to the comet nucleus. Continuous LF sampling at a frequency sufficiently high to resolve the lower hybrid frequency was not possible to fit within the NM telemetry constraint, but by having much lower sampling frequency (0.226 samples/s) most of the time, it was possible to use a higher sampling rate of 14.45 samples/s in every 6th AQP in macro 0x710, and every 5th AQP in macro 0x910. In this way, there is quasi-continuous data all the time as well as the possibility to resolve somewhat higher frequencies, at the cost of varying sampling frequency. This is only used in macros 0x710 and 0x910, which were used only during the EXT3 phase (approx. July-September 2016), mainly in the final descent and the days preceeding it. The label keywords ROSETTA:LAP_P1P2_ADC20_DOWNSAMPLE and ROSETTA:LAP_P1P2_ADC20_MA_LENGTH would be ambiguous for these data products and have thus been removed from the relevant label files. For further explanations of macros, AQPs etc consult the EAICD document.
These data are available on-line from the Planetary Data System (PDS) at:
https://pdssbn.astro.umd.edu/holdings/ro-c-rpclap-3-ext3-calib2-v1.0/
Questions and comments about this data collection can be directed to: Dr. David R. Williams
Name | Role | Original Affiliation | |
---|---|---|---|
Dr. Anders Eriksson | Data Provider | anders.eriksson@rymdfysik.uu.se | |
Dr. Erik Johansson | General Contact | erik.johansson@irfu.se |