Data Set Overview  :   This data set contains Raw data taken by New Horizons  Solar Wind Around Pluto  instrument during the PLUTOCRUISE mission phase.  SWAP comprises electro-optics and detectors to obtain count rate measurements of the solar wind; measuring the solar wind before, during and after the Plutoencounter 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.    SWAP Observations for Pluto Cruise (ACO1-8)  :    SWAP Observation Summary   After being turned off for the first 460+ days of Pluto Cruise,  SWAP operations were sporadic and mostly Science, alternating with  Channel Electron Multiplier (CEM) gain tests on 2008-09-28 and  2008-10-27 (2008-272 and 2008-301). See SWAP Note 1 below.   During cruise observations the spacecraft is in the heliosphere  and consequently measures solar wind protons (H+), alpha particles  (He++) and interstellar pickup ions (primarily H+). The alphas  typically have twice the energy per charge of the protons, and the  interstellar pickup cutoff occurs at four times the energy per  charge of the solar wind protons. See SWAP Notes 2 and 3 below.   From 2011 through 2014, analysis of spacecraft power margins  indicated that SWAP could operate during hibernation; prior to  that time SWAP was normally off during hibernation. So after  2010, SWAP collected science data for most of the rest of the  Pluto Cruise mission phase, with breaks for ACO periods 5-8 for  instrument monitoring, testing and characterization.    SWAP Plan ID Table   The following table summarizes the real-time data taken with  unique combinations of Plan and Table IDs as saved in the FITS  headers. The Real column contains the counts of real-time data  products during the time (Days Of Year - DOYs - and METs) on each  line; the Sum/Hist column contains approximations of the counts of  Summary and Histogram data products near in time to the real-time  data. See SWAP Notes 1, 4 and 5 below, and refer to the SOC ICD  for more details.    Start Stop Plan/Table  YrDOY YrDOY StartMET StopMET ID/ID Real Sum/Hst  08272 08286 0084902336 0086176383 2/2 5 14  08289 08289 0086356736 0086384639 5/5 1 0  08301 08301 0087386368 0087391807 2/2 1 1  08303 09204 0087555520 0110595647 12/10 41 89  09204 09204 0110595648 0110601151 2/2 1 0  09204 10163 0110602688 0138592767 12/10 5 8  10163 10163 0138592768 0138598207 2/2 1 0  10163 10171 0138599872 0139339647 12/10 8 14  10171 10171 0139339648 0139348223 5/5 1 1  10185 10196 0140500096 0141557375 12/10 13 28  10196 10196 0141557376 0141562815 2/2 1 1  10198 11143 0141674304 0168412479 12/10 10 20  11143 11143 0168412480 0168417919 2/2 1 0  11143 11170 0168418944 0170836479 12/10 29 65  11170 11170 0170836480 0170841919 2/2 1 0  11170 12143 0170844800 0199932351 12/10 96 191  12143 12143 0199933184 0199938751 2/2 1 0  12143 12179 0199938752 0203138943 12/10 29 61  12179 12179 0203141376 0203147007 2/2 1 1  12190 13171 0204011904 0233976959 12/10 269 539  13171 13171 0233982016 0233987519 2/2 1 0  13171 13219 0233987520 0238213887 12/10 42 83  13219 13219 0238213888 0238219839 2/2 1 2  13234 14186 0239435008 0266810495 12/10 254 509  14186 14186 0266810496 0266816191 2/2 1 0  14186 14229 0266816192 0270603839 12/10 27 67    SWAP Notes:   1) As of 2008-10-28 and in the future, the Plan ID 2 identifies  all CEM gain tests: gain tests are performed only with Plan 2  data, and Plan 2 data are used only for CEM gain tests. The Plan  ID is given in the HOUSEKEEPING FITS extensions for all SWAP FITS  files. In the realtime (ApID 0x584) files the Plan ID is also in  the TIME and REAL_TIME extension. In the histogram (0x586) files  the Plan ID is in the primary file header.   2) Only interstellar pickup ions are observed when the Sun is not  in the field-of-view during the cruise phase; since the solar wind  is typically radial, one can use the direction to the Sun in the  instrument reference frame as an analog for determining whether  the Sun is in the field of view. The Sun direction is available  via the angles PHI_SUN_SC and THETA_SUN_SC in the real-time PDS  OBJECT EXTENSION_SPORBATTCALC_TABLE (FITS extension  SPICE_ORBIT_ATTITUDE_CALC); if PHI_SUN_SC is between -10 and +10  degrees, and THETA_SUN_SC is between -138 and +138 degrees, then  the Sun is in the field-of-view.   3) We recommend using only the coincidence (COIN) count rates  since the background noise level is lowest for this signal. The  coincidence signal is derived onboard by analyzing the timing of  the primary (PCEM) and secondary (SCEM) channel electron  multiplier signals. We highly recommend reading the SWAP ICD since  we have included a spectrogram plot for the entire Jupiter data  set and another one for the entire mission through the end of the  2013 annual check out. We also include information about the  energy sweep patterns, descriptions of both the packet and data  types, and show screen shots of what the files look like when  opened with a FITS file viewer. Reading the information in the  SWAP ICD will guide the PDS user in interpreting the data.   4) A contiguous time in this table does not imply that data were  collected during that entire time; for example SWAP data cover  less than a day in 2009.   5) Table ID cycled between 10 and 11, sometimes over the course of  one day, so the Table IDs above are quoted plus or minus 1.   6) Plan or Table IDs of zero in the data are ignored.   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_PLUTOCRUISE.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 (Science Operations Center - Instrument  Interface Control Document: SOC_INST_ICD) and to the steps required  to calibrate the data.    SWAP updates for Pluto Cruise  Data Sets V3.0  :   The previous Pluto Cruise data sets' deliveries (V2.0) went  through peer review in December, 2014. When subsequent versions  of those data sets were being delivered, some with additional data  (from August, 2014 through January, 2015) before all of those  previous liens were resolved, the previous data sets were left as  is, with those liens folded into the newer data sets.   New observations added with this version (V3.0) include ongoing  cruise observations from August, 2014 through January, 2015.   Other changes for this version were re-running of the ancillary  data in the data product, updated geometry from newer SPICE  kernels, minor editing of the documentation, catalogs, etc., and  resolution of liens from the December, 2014 review, plus those  from the May, 2016 review of the Pluto Encounter data sets.i    SWAP updates for Pluto Cruise Data Sets V2.0  :    Added over 2200 DATA/ files from Annual CheckOuts 5-8 (ACO5-8),  plus cruise and hibernation observations, from approximately  mid-2010 through late 2014. The initial version of this  data set contained data only through mid-2010.   About two-thirds of the products from V1.0 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 in V2.0 and the corresponding old names from V1.0 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).    Processing  :   The data in this data set were created by a software data  processing pipeline on the Science Operations Center (SOC) at  the Southwest Research Institute (SwRI), Department of Space Operations. 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.   SWA_0123456789_0X584_ENG.FIT  ^^^ ^^^^^^^^^^ ^^^^^ ^^^\__/  | | | | ^^  | | | | |  | | | | +--File type (includes dot)  | | | | - .FIT for FITS file  | | | | - .LBL for PDS label  | | | | - not part of product ID  | | | |  | | | +--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  | | N.B. ApIDs are case-insensitive  | |  | +--MET (Mission Event Time) i.e. Spacecraft Clock  |  +--Instrument designator    Note that, depending on the observation, the MET in the data filename  and in the Product ID may be similar to the Mission Event Time (MET)  of the actual observation acquisition, but should not be used as an  analog for the acquisition time. The MET is the time that the data are  transferred from the instrument to spacecraft memory and is therefore  not a reliable indicator of the actual observation time. The PDS label  and the index tables are better sources to use for the actual timing of  any observation. The specific keywords and index table column names for which to look are   * START_TIME  * STOP_TIME  * SPACECRAFT_CLOCK_START_COUNT  * SPACECRAFT_CLOCK_STOP_COUNT    Instrument Instrument designators ApIDs **  : : :  SWAP SWA 0X584 - 0X587 *   * Not all values in this range are in this data set  ** ApIDs are case insensitive   There are other ApIDs that contain housekeeping values and  other values. See SOC Instrument ICD (/DOCUMENT/SOC_INST_ICD.*)  for more details.    Here is a summary of the types of files generated by each ApID  (N.B. ApIDs are case-insensitive) along with the instrument  designator that go with each ApID:    ApIDs Data product description/Prefix(es)  : :  0x584 - SWAP Science Real-Time/SWA  0x585 - SWAP Science Summary/SWA *  0x586 - SWAP Science Histogram Header/SWA  0x587 - SWAP Science Histogram Data/SWA  * Level 3 NH SWAP data sets produced after April, 2016 do not have 0x585  (Science Summary data); in-flight and in practice, 0x585 data are used  only for health and safety and not for science.    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   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. PDS-SBN  practices 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. TARGET_NAME may be N/A (Not Available or Not  Applicable) for a few observations in this data set; typically that  means the observation is a functional test so N/A is an appropriate  entry for those targets, but the PDS user should also check the  NEWHORIZONS:OBSERVATION_DESC and NEWHORIZONS:SEQUENCE_ID keywords in  the PDS label, plus the provided sequence list (see Ancillary Data  below) to assess the possibility that there was an intended target.    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-PLUTOCRUISE-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_PLUTOCRUISE.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. Some  sequences may have failed to execute due to spacecraft events (e.g.  safing). No attempt has been made during the preparation of this data  set to identify such empty sequences, so it is up to the user to  compare the times of the sequences to the times of the available  observations from INDEX/INDEX.TAB 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) was 65.184s at  NH launch, and the first three additional leapseconds occured  in at the ends of December, 2009, June, 2012 and June, 2015.  Refer to the NH SPICE data set, NH-J/P/SS-SPICE-6-V1.0, and the  SPICE toolkit docmentation, for more details about leapseconds.   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, Princeton University   David McComas   Princeton University  Princeton Plasma Physics Laboratory  Peyton Hall  Princeton, NJ 08544  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-X-SWAP-2-PLUTOCRUISE-V3.0,   may not have corresponding data products in the calibrated data set,   NH-X-SWAP-3-PLUTOCRUISE-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_PLUTOCRUISE.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.    Observation descriptions in this data set catalog  :   Some users will expect to find descriptions of the observations  in this data set here, in this Confidence Level Note. This data  set follows the more common convention of placing those  descriptions under the Data Set Description (above, if the user is  reading this in the DATASET.CAT file) of this data set catalog.    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  2017-03-19.