NSSDCA ID: PSFP-00347
Availability: Archived at NSSDC, accessible from elsewhere
This description was generated automatically using input from the Planetary Data System.
Data Set Overview ================= This data set contains Raw data taken by New Horizons Solar Wind Around Pluto instrument during the LAUNCH mission phase. During Post-Launch mission phase, the SWAP team ran a series of engineering tests and some preliminary science observations. Below is a list and dates for these various commissioning tests. The first solar wind observations occurred in SWAP-009. SWAP-006 provided the first count rate measurements taken in engineering mode (not sweeping). In this test the ESA and deflector voltages were varied. SWAP-007 was a sequenced version of the test performed in SWAP-006. SWAP-009 part 5 was a test performed in engineering mode stepping through some of the same ESA and deflector voltages used in SWAP-006 and -007. The first sweeping science observations were performed in SWAP-008 where the science team turned the instrument away from the Sun and took observations using voltages planned for Pluto. The first solar wind observations were performed in SWAP-009 part 2, which had the RPA Voltage set to 103% of ESA energy. This resulted in an automatic shut down since these voltage settings were not sufficient to reduce the passband to the point where the detected count rates were safe. In SWAP-009 part 6 the team adjusted the percent crossing to 105% and then took small amounts of data across many days. Observations in SWAP-009 part 6 consist of 6 minutes of data on each given day. Only parts 2, 5 & 6 of SWAP-009 were run; parts 1, 3 & 4 were never run and are not included here. SWAP-001 Aliveness Test (Feb 27, 2006) SWAP-002 Low Voltage Functional (Feb 27, 2006) SWAP-004 Memory Test (Feb 28, 2006) SWAP-005 Door Opening (March 13th, 2006) SWAP-006 High Voltage Ramp (March 28 & 30 2006) SWAP-007 Sequenced High Voltage Ramp (June 5, 2006) SWAP-008 High Voltage Science With No Solar wind (Sept 1, 2006) SWAP-009 Solar Wind Measurements and DFL-ESA test Load Date SC Time MET - Test Name, Part Number (Description) 06265 September 27, 2006 267 20:00:07 21433924 - SWAP-009 pt 2 (First HVSCI 103% crossing) 06275 October 7, 2006 280 10:00:02 22521119 - SWAP-009 pt 5 (DFL-ESA) 06298 November 1, 2006 305 02:02:43 24652480 - SWAP-009 Pt 6 (HVSCI 105% crossing) 06298 November 2, 2006 306 02:02:43 24738880 - SWAP-009 Pt 6 (HVSCI 105% crossing) 06298 November 3, 2006 307 03:03:31 24828928 - SWAP-009 Pt 6 (HVSCI 105% crossing) 06298 November 4, 2006 308 03:03:31 24915328 - SWAP-009 Pt 6 (HVSCI 105% crossing) 06298 November 5, 2006 309 03:03:31 25001728 - SWAP-009 Pt 6 (HVSCI 105% crossing) 06309 November 12, 2006 316 00:03:15 25595712 - SWAP-009 Pt 6 (HVSCI 105% crossing) 06309 November 13, 2006 317 00:03:15 25682112 - SWAP-009 Pt 6 (HVSCI 105% crossing) 06309 November 14, 2006 318 00:03:15 25768512 - SWAP-009 Pt 6 (HVSCI 105% crossing) 06309 November 15, 2006 319 01:02:59 25858496 - SWAP-009 Pt 6 (HVSCI 105% crossing) 06309 November 16, 2006 320 01:02:59 25944896 - SWAP-009 Pt 6 (HVSCI 105% crossing) 06309 November 17, 2006 321 01:02:59 26031296 - SWAP-009 Pt 6 (HVSCI 105% crossing) 06322 November 30, 2006 334 10:02:43 27186880 - SWAP-009 Pt 6 (HVSCI 105% crossing) 06322 December 1, 2006 335 10:02:43 27273280 - SWAP-009 Pt 6 (HVSCI 105% crossing) 06322 December 2, 2006 336 10:02:43 27359680 - SWAP-009 Pt 6 (HVSCI 105% crossing) 06322 December 3, 2006 337 11:03:31 27449728 - SWAP-009 Pt 6 (HVSCI 105% crossing) 06322 December 4, 2006 338 11:03:31 27536128 - SWAP-009 Pt 6 (HVSCI 105% crossing) 06322 December 5, 2006 339 11:03:31 27622528 - SWAP-009 Pt 6 (HVSCI 105% crossing) 06340 December 9, 2006 343 04:03:15 27942912 - SWAP-009 Pt 6 (HVSCI 105% crossing) 06340 December 10, 2006 344 04:03:15 28029312 - SWAP-009 Pt 6 (HVSCI 105% crossing) 06340 December 11, 2006 345 04:03:15 28115712 - SWAP-009 Pt 6 (HVSCI 105% crossing) Every observation provided in this data set was taken as a part of a particular sequence. A list of these sequences follows: Sequence IDs & start times (end times are the start times of the following Sequence IDs) for the SWAP instrument during the LAUNCH phase of the New Horizons Mission ========================================================= Sequence ID: COSW_CHECKOUT Start UTC: 2006-01-18T00:00:00 Start SCLK: N/A Description: COMMISSIONING: Turn-on & checkout Sequence ID: COSW_SCIENCE Start UTC: 2006-04-01T00:00:00 Start SCLK: 1/0006155517:32813 Description: COMMISSIONING: Science Sequence ID: JESW_PLACEHOLDER Start UTC: 2007-01-01T00:00:00 Start SCLK: 1/0029915517:30912 Description: The SWAP instrument did not have any sequenced data taken during Jupiter encounter. This entry is only a placeholder to cover any data that exist. For the list of observations and their parameters, refer to the data set index table (typically INDEX.TAB & CUMINDEX.TAB, initially in the /INDEX/ area of the data set). Time ==== There are several time systems, or units, in use in this dataset: New Horizons spacecraft MET (Mission Event Time or Mission Elapsed Time), UTC (Coordinated Universal Time), and TDB Barycentric Dynamical Time. This section will give a summary description of the relationship between these time systems. For a complete explanation of these time systems the reader is referred to the documentation distributed with the NAIF/SPICE toolkit from the NAIF PDS node. The most common time unit associated with the data is is the spacecraft MET. MET is a 32-bit counter on the New Horizons spacecraft that runs at a rate of about one increment per second starting from a value of zero at 19.January, 2006 18:08:02 UTC or JD2453755.256337 TDB. The leapsecond adjustment (DELTA_ET = ET - UTC) over this dataset is 65.184s. The data labels for any given product in this dataset usually contain at least one pair of common UTC and MET representations of the time at the middle of the observation. Other portions of the products, for example tables of data taken over periods of up to a day or more, will only have the MET time associated with a given row of the table. For the data user's use in interpreting these times, a reasonable approximation (+/- 1s) of the conversion between Julian Day (TDB) and MET is as follows: JD TDB = 2453755.256337 + ( MET / 86399.9998693 ) For more accurate calculations the reader is referred to the NAIF/SPICE documentation as mentioned above. Processing ========== The data in this data set were created by a software data processing pipeline on the Science Operation Center (SOC) at the Southwest Research Institute (SWRI), Department of Space Studies. This SOC pipeline assembled data as FITS files from raw telemetry packets sent down by the spacecraft and populated the data labels with housekeeping and engineering values, and computed geometry parameters using SPICE kernels. The pipeline did not resample the data. Data ==== The observations in this data set are stored in data files using standard Flexible Image Transport Sytem (FITS) format. Each FITS file has a corresponding detached PDS label file, named according to a common convention. The FITS files have image and/or table extensions; see the PDS label plus the DOCUMENT files for a description of these extensions and their contents. This Data section comprises the following sub-topics: - Filename/Product IDs - Other sources of information useful in interpreting these Data - CODMAC Level 2 SWAP data details - Instrument description - Visit Description, Visit Number, and Target in the Data Labels - Unresolved Liens on the Data Filename/Product IDs -------------------The filenames and product IDs of observations adhere to a common convention e.g. ALI_0123456789_0X0AB_ENG_1.FIT ^^^ ^^^^^^^^^^ ^^^^^ ^^^ ^__/ | | | | | ^^ | | | | | | | | | | | +--File type (includes dot) | | | | | - .FIT for FITS file | | | | | - .LBL for PDS label | | | | | - not part of product ID | | | | | | | | | +-- Version number from the SOC | | | | (Science Operations Center) | | | | | | | +--ENG for CODMAC Level 2 data * | | | SCI for CODMAC Level 3 data * | | | | | +--Application ID (ApID) of the telemetry data | | packet from which the data come | | | +--MET (Mission Event Time) i.e. Spacecraft Clock | +--Instrument designator * For those datasets where the NH project is delivering CODMAC Level 1 & 2 data (REX & PEPSSI), ENG and SCI apply to CODMAC Level 1 & 2 data, respectively. Instrument Instrument designators ApIDs =========== ================================== ============= SWAP SWA 0X584 - 0X586 * Not all values in this range are used There are other ApIDs that contain housekeeping values and other values. See the documentation for more details. Here is a summary of the types of files generated by each ApID along with the instrument designator that go with each ApID: ApIDs Data product description/Prefix(es) ===== =================================== 0x584 - SWAP Science Real-Time/SDC 0x585 - SWAP Science Summary/SWA 0x586 - SWAP Science Histogram Header/SWA 0x587 - SWAP Science Histogram Data/SWA Other sources of information useful in interpreting these Data -------------------------------------------------------------Refer to the following files for more information about these data NH Trajectory table: /DOCUMENT/NH_TRAJECTORY.* SWAP Field Of View definitions: /DOCUMENT/NH_FOV.* /DOCUMENT/NH_SWAP_V###_TI.TXT SWAP Data summary plots: /DOCUMENT/DATA_SUMMARY_PLOTS/SWAP_###DAY_YYYYMMDDHH_#.* Instrument description ---------------------Refer to the following files for a description of this instrument. CATALOG SWAP.CAT DOCUMENTS SWAP_SSR.* NH_SWAP_V###_TI.TXT (### is a version number) SOC_INST_ICD.* Visit Description, Visit Number, and Target in the Data Labels --------------------------------------------------------------The observation sequences were defined in Science Activity Planning (SAP) documents, and grouped by Visit Description and Visit Number. The SAPs are spreadsheets with one Visit Description & Number per row. A nominal target is also included on each row and included in the data labels, but does not always match with the TARGET_NAME field's value in the data labels. In some cases, the target was designated as RA,DEC pointing values in the form ``RADEC=123.45,-12.34'' indicating Right Ascension and Declination, in degrees, of the target from the spacecraft in the Earth Equatorial J2000 inertial reference frame. This indicates either that the target was either a star, or that the target's ephemeris was not loaded into the spacecraft's attitude and control system which in turn meant the spacecraft could not be pointed at the target by a body identifier and an inertial pointing value had to be specified as Right Ascension and Declination values. The PDS standards do not allow putting a value like RADEC=... in the PDS TARGET_NAME keyword's value; in those cases the PDS TARGET_NAME value is set to CALIBRATION. Unresolved Liens on the Data ---------------------------None exist at the present time. Ancillary Data ============== The geometry items included in the data labels were computed using the SPICE kernels archived in the New Horizons SPICE data set, NH-X-SPICE-6-LAUNCH-V1.0. Reference Frame =============== Geometric Parameter Reference Frame ----------------------------------Earth Mean Equator and Vernal Equinox of J2000 (EMEJ2000) is the inertial reference frame used to specify observational geometry items provided in the data labels. Geometric parameters are based on best available SPICE data at time of data creation. Epoch of Geometric Parameters ----------------------------All geometric parameters provided in the data labels were computed at the epoch midway between the START_TIME and STOP_TIME label fields. Software ======== The observations in this data set are in standard FITS format with PDS labels, and can be viewed by a number of PDS-provided and commercial programs. For this reason no special software is provided with this data set. Contact Information =================== For any questions regarding the data format of the archive, contact the person whose PDS_USER_ID is DMCCOMAS as described in PERSONNEL.CAT.
These data are available on-line from the Planetary Data System (PDS) at:
http://pdssbn.astro.umd.edu/holdings/nh-x-swap-2-launch-v2.0/
Questions and comments about this data collection can be directed to: Dr. David R. Williams
Name | Role | Original Affiliation | |
---|---|---|---|
Dr. David J. McComas | Data Provider | Southwest Research Institute | dmccomas@pppl.gov |
Dr. Joseph Peterson | General Contact | Southwest Research Institute | joe@boulder.swri.edu |