Data Set Overview
    =================

    This data set contains SREM omni-directional fluxes in MeV provided at
    particular effective energies, converted from the equivalent SREM
    Level 2 CDF products, which are provided in the EXTRAS directory.
    Note that the CDF processing levels differ from the CODMAC definition
    used within these PDS data sets.  The SREM CDF Level 0 data are
    equivalent to the PDS CODMAC Level 2 data while the SREM CDF Level 2
    data are equivalent to the PDS CODMAC Level 5 data.

    These data are useful for determining the energetic particle
    environment experienced by the Standard Radiation Environment Monitor
    onboard the Rosetta Orbiter.

    Processing
    ==========

    Differential fluxes have first been derived from the 'raw' Level 0 CDF
    count rate data using a dedicated unfolding technique over pre-defined
    energies. The unfolding technique is based on the regularized Singular
    Value Decomposition (SVD) method described in [SANDBERGETAL2012], and
    in the SREMDC_FINAL_REPORT_V1.0.PDF file found in the DOCUMENT directory.

    The fluxes have then been rescaled according to cross-calibration
    studies between fluxes before a rescaling step against selected reference
    datasets.  SEPEM Reference Dataset v2.0 (i.e. GOES/EPS fluxes cross-
    calibrated with IMP-8/GME) has been selected as reference for proton
    fluxes, while RBSP/MAGEIS spin averaged datasets were selected as a
    reference for electron fluxes.  As a result of this process, the highest
    energy flux levels derived for the electron data were not reliable. Thus,
    it was decided to reject entirely these products in the production of this
    Level 5 data set.  As such, only 10 energy channels are made available for
    electron fluxes.  These are #1-#10 in the table on page 48 of the
    SREMDC_FINAL_REPORT_V1.0.PDF file, available in the DOCUMENT directory.

    A quality value is also provided alongside the fluxes, giving
    recommendations on their use, as described in the table below.

    FPDO:         Flux Proton Differential Omnidirectional
    FEDO:         Flux Electron Differential Omnidirectional
    FQDO_Quality: Flux Q Differential Omnidirectional_Quality
    where (Q=P,E)
    Where:
    ---------------|-------------------------|------------------
    FQDO_Quality   | Comment                 | Recommendation
    ---------------|-------------------------|------------------
    FQDO_Quality=0 | SREM count-rate data    | Use FQDO
                   | determined by charged   |
                   | particle fluxes Q.      |
    ---------------|-------------------------|------------------
    FQDO_Quality=1 | SREM count-rate data    | Use FQDO with
                   | most likely determined  | some caution
                   | by charged particle     |
                   | fluxes Q.               |
    ---------------|-------------------------|------------------
    FQDO_Quality=2 | SREM count-rate         | Do not use FQDO
                   | contaminated by         |
                   | various sources. None   |
                   | criterion is satisfied  |
    ---------------|-------------------------|------------------
    FQDO_Quality=3 | SREM count-rate         | Do not use FQDO
                   | dominated by fluxes of  |
                   | non-Q particles.        |
    ---------------|-------------------------|------------------
    FQDO_Quality=5 | SREM count-rate data    | Do not use FQDO
                   | dominated by background |
                   | (cosmic, detector       |
                   | electronics)            |
    ---------------|-------------------------|------------------

    (Table above is taken from SREMDC_Final_Report_V1.0.PDF,
    available in the DOCUMENT directory)

    Data
    ====

    One data product is provided per day of measurement.  Data products
    are named according to the following convention:

    SREM_L_YYYYMMDD.EXT

    Where:

     is the CODMAC processing level (2 for the count rate data and 5 for
        the derived proton and electron flux data).

    YYYMMDD is the date of the observation.

    EXT is the file extension (TAB for the ASCII data table and LBL for
        the detached PDS label file).

    All data products are formatted as plain ASCII tables and have an
    associated detached PDS label.

    The CODMAC Level 5 data are given as protons and electrons energy
    values and their associated quality values, with measurements
    time tagged at the middle of the time interval (centered). The LBL
    file contains metadata with information about the instrument,
    mission, any important instrument parameters or measurement
    parameters, start and stop time of the measurement, and the pointer
    to the TAB object.

    The data table is structured as follows:

    - A first row with text headers defining each column in the subsequent
      data table.  For each column containing the proton and electron energy
      measurements, the central energy value of the channel in MeV is used.

    - A data table (called SREM_DATA_TABLE) with each row containing the
      following columns:

      Time:              A time tag per measurement, at the center of the
                         observation.
      Proton Energies:   13 proton energy values in MeV.
      Proton Quality:    An indication of the quality of the proton
                         measurements.
      Electron Energies: 10 electron energy values in MeV.
      Electron Quality:  An indication of the quality of the electron
                         measurements.


    IMPORTANT NOTES:
    - As noted above, the time values provided mark the center time of
      the observation.
    - The PDS keyword MISSING_CONSTANT, which is provided in every LBL file,
      indicates the value (-1.0E31) used in the data table if no measurement
      data is available.  Any zero values in the data tables are real
      measurements.
    - The quality values used are described above, and are also provided
      directly within the DESCRIPTION field of each LBL file.
    - As noted above, the electron data set was cross-calibrated with
      RBSP/MAGEIS spin averaged data.  It has been noted that as a result of
      this process the highest energy flux levels derived were not reliable.
      Thus, it was decided to reject entirely these products in the
      production of the Level 2 CDF data.  As such, only 10 energy channels
      are made available, #1-#10 in the table on page 48 of the
      SREMDC_FINAL_REPORT_V1.0.PDF file, available in the DOCUMENT directory.

    Software
    ========

    No software is provided with this data set.  All products are provided as
    plain ASCII tables and can be read using the standard freely available
    NASAView and ReadPDS software packages.


    Media/Format
    ============

    The data set will be delivered and kept online.

All data have been reviewed by the SREM
                                       team to check for data set completeness
                                       and screened for non-physical values
                                       such as negative energy.  No obvious
                                       errors have been found in the data at
                                       this time.  Data have also been passed
                                       through two Rosetta independent science
                                       reviews, and all items raised have been
                                       addressed.