Data Set Overview  :   This data set contains Calibrated data taken by New Horizons  Solar Wind Around Pluto  instrument during the JUPITER mission phase.  SWAP comprises electro-optics and detectors to obtain count rate measurements of the the solar wind; measuring the solar wind before, during and after the Pluto encounter will allow characterization of the atmospheric escape rate of Pluto. The SWAP electro-optic elements select the angles and energies of the solar wind and pickup ions to be measured; ions thus selected are registered with a coincidence detector system. SWAP measures the energy spectrum of ions in its environment by varying (also called scanning or sweeping) voltages of the electro-optics over many steps during a short time period. SWAP can also immediately follow a sweep of coarse voltage steps with a sweep of finer steps, centered on the peak measurement of the coarse sweep, to obtain a higher resolution of that portion of the energy spectrum.  There are three types of SWAP science data: real-time; summary; histogram. Real-time data, at rates up to 1Hz, provide the most detailed science measurements since they contain the full count rate distribution as a functionof energy (speed). For science summary and science histogram modes, the full distribution is not recorded. Instead, parameters are derived from the count rate distribution stored by SWAP. These derived parameters require less memorythan storing the whole distribution. The science summary and science histogrammodes are primarily used during the cruise phase of the mission. For science data, the common data product is usually a binary table; for calibrated real-time data, spectrograms as images are also provided. Typically the tableshave instrument parameters and measurements in the columns and measurement times in the rows, but the actual format depends on the type of data and the processing level (raw vs. calibrated). Other tables containing houskeeping andother parameters are also provided. This data set includes documentation for all data types and formats.  During the Jupiter mission phase, SWAP made near-continuous science observations, taking data between 2 and 12 times per hour. Inbound to Jupiter, real-time science mode data were taken twice per hour, then 12 measurements were recorded per hour in the Jupiter tail. The Jupiter tail observations continue until about 100 days after closest approach, which corresponds to about 2200 RJ downstream.    Every observation provided in this data set was taken as a part of a  particular sequence. A list of these sequences has been provided in  file DOCUMENT/SEQ_SWAP_JUPITER.TAB.  N.B. Some sequences provided may have no corresponding observations.   For a list of observations, refer to the data set index table; this  is typically INDEX.TAB initially in the INDEX/ area of the data set;  there is also a file SLIMINDX.TAB in INDEX/ that summarizes key  information relevant to each observation, including which sequence  was in effect and what target was likely intended for the  observation.    Version  :   This is VERSION 3.0 of this data set.   The pipeline (see Processing below) was re-run on these data for each  version since the first (V1.0). As a result, ancillary information,  such as observational geometry and time (SPICE), may be updated.  This will affect, for example, the calibration of the data if parameters such as the velocity or orientation of the target relative to the  instrument, or the recorded target itself, have changed.   See the following sections for details of what has changed over each  version since the first (V1.0). Note that even if this is not a  calibrated data set, the calibration changes are listed as the data  will have been re-run and there will be updates to the calibration  files, to the documentation and to the steps required to calibrate  the data.    SWAP updates for Data Sets V3.0  :   About two-thirds of the products have been redelivered with changed  PRODUCT_IDs and new filenames; the data in those products will not have  changed significantly if at all. A table listing the new names and the  corresponding old names from the previous version has been provided in  the DOCUMENT/ subdirectory of this data set; refer to the PDS label of  that TABLE for more details. These changes are due to modifications  made to the file naming algorithms in the source data processing  pipeline software in the Science Operations Center (SOC).   Also, new versions of the SWAP spectrogram sample plots have been  generated and provided with this data set.    SWAP updates for Data Sets V2.0  :    New columns in REAL_TIME data extension  ---------------------------------------   Added the center energy for given RPA and ESA voltages to the  REAL_TIME data extension. The column names are ENERGY_0 and  ENERGY_1 in eV and correspond to the 1st and 2nd measurement  in a given packet (row).    Calibration corrections  -----------------------   Corrected the background subtraction. Corrected a rounding  error in the time used to calculate the spin angles in the SPICE  extension and fixed a small offset in the times for the spectrogram  in the TIME_LABEL_SPECT extension.    Miscellaneous calibration corrections  -------------------------------------   Added 1-day and 10-day plots under the documents directory  in a folder called data_summary plots.     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 System (FITS) format. Each FITS  file has a corresponding detached PDS label file, named according  to a common convention. The FITS files may 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  - Instrument description  - Other sources of information useful in interpreting these Data  - Visit Description, Visit Number, and Target in the Data Labels    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 - 0X587 *   * Not all values in this range are in this data set   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    Instrument description  ----------------------   Refer to the following files for a description of this instrument.   CATALOG   SWAP.CAT   DOCUMENTS   SWAP_SSR.*  SOC_INST_ICD.*  NH_SWAP_V###_TI.TXT (### is a version number)    Other sources of information useful in interpreting these Data  --------------------------------------------------------------   Refer to the following files for more information about these data   NH Trajectory tables:   /DOCUMENT/NH_MISSION_TRAJECTORY.* - Heliocentric  /DOCUMENT/NH_TRAJECTORY.* - Jupiter-centric   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_#.*     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.    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-JUPITER-V1.0.   Every observation provided in this data set was taken as a part of a  particular sequence. A list of these sequences has been provided in  file DOCUMENT/SEQ_SWAP_JUPITER.TAB. In addition, the  sequence identifier (ID) and description are included in the PDS label  for every observation. N.B. While every observation has an associated  sequence, every sequence may not have associated observations; that is,  some sequences may have failed to execute due to spacecraft events  (e.g. safing) and there will be observations associated with those  sequences. No attempt has been made during the preparation of this  data set to identify if any, or how many, such empty sequences there  are, so it is up to the user to compare the times of the sequences  to the times of the available observations from the INDEX/INDEX.TAB  table to identify such sequences.    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 Navigation and Ancillary Information  Facility (NAIF) SPICE toolkit from the PDS NAIF node, (see  http://naif.jpl.nasa.gov/).   The most common time unit associated with the data 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.    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   New Horizons SWAP Principal Investigator:   David McComas, Southwest Research Institute   David McComas   Southwest Research Institute  Space Science and Engineering  P.O. Drawer 28510  San Antonio, TX 78228-0510  USA

Confidence Level Overview  :  During the processing of the data in preparation for  delivery with this volume, the packet data associated with each  observation were used only if they passed a rigorous verification  process including standard checksums.   In addition, raw (Level 2) observation data for which adequate  contemporary housekeeping and other ancillary data are not available  may not be reduced to calibrated (Level 3) data. This issue is raised  here to explain why some data products in the raw data set,   NH-J-SWAP-2-JUPITER-V3.0,   may not have corresponding data products in the calibrated data set,   NH-J-SWAP-3-JUPITER-V3.0.    Data coverage and quality  :   Every observation provided in this data set was taken as a part of a  particular sequence. A list of these sequences has been provided in  file DOCUMENT/SEQ_SWAP_JUPITER.TAB. N.B. Some sequences  provided may have zero corresponding observations.   Refer to the Confidence Level Overview section above for a summary  of steps taken to assure data quality.    Caveat about TARGET_NAME in PDS labels and observational intent  :    A fundamental truth of managing data from some spacecraft missions  is that the intent of any observation is not suitable for insertion  into the command stream sent to the spacecraft to execute that  observation. As a result, re-attaching that intent to the data  that are later downlinked is problematic at best; for New Horizons  that task is made even more difficult as the only meta-data that  come down with the observation is the unpredictable time of the  observation. The task is made yet even more difficult because  uplink personnel, who generate the command sequences and initially  know the intent of each observation, are perpetually under  deadlines imposed by orbital mechanics and can rarely be spared for  the time-intensive task of resolving this issue.   To make a long story short, the downlink team on New Horizons has  created an automated system to take various uplink products, decode  things like Chebyshev polynomials in command sequences representing  celestial body ephemerides for use on the spacecraft to control  pointing, and infer from those data what the most likely intended  target was at any time during the mission. This works well during  flyby encounters and less so during cruise phases and hibernation.   The point to be made is that the user of these PDS data needs to  be cautious when using the TARGET_NAME and other target-related  parameters stored in this data set. This is less an issue for the  plasma and particle instruments, more so for pointing instruments.  To this end, the heliocentric ephemeris of the spacecraft, the  spacecraft-relative ephemeris of the inferred target, and the  inertial attitude of the instrument reference frame are provided  with all data, in the J2000 inertial reference frame, so the user  can check where that target is in the Field Of View (FOV) of the  instrument. Furthermore, for pointing instruments with one or more  spatial components to their detectors, a table has been provided  in the DOCUMENT/ area with XY (two-dimensional) positions of each  inferred target in the primary data products; if those values are  several thousand pixels off of a detector array, it is a strong  indication that the actual target of that observation is something  other than the inferred target, or no target at all e.g. dark sky.    Review  :  This dataset was peer reviewed and certified for scientific use on  TBD.