PDS_VERSION_ID = PDS3
LABEL_REVISION_NOTE = "
2022-06-30, Y. Futaana (IRF). Initial Release"
RECORD_TYPE = STREAM
RELEASE_ID = 0001
REVISION_ID = 0000
SPACECRAFT_NAME = "VENUS EXPRESS"
INSTRUMENT_HOST_ID = VEX
INSTRUMENT_ID = ASPERA4
MISSION_NAME = "VENUS EXPRESS"
DATA_SET_ID = "VEX-V/SW-ASPERA4-3-EXT3-ELSDNF-V1.0"
OBJECT = TEXT
PUBLICATION_DATE = 2022-06-30
NOTE = "AAREADME.TXT describes the data set
VEX-V/SW-ASPERA4-3-EXT3-ELSDNF-V1.0"
END_OBJECT = TEXT
END
1. Introduction
This dataset contains data from the Electron Spectrometer (ELS)
component of the ASPERA-4 instrument from the Venus Express mission
between the dates of start and end of the extended mission phase 2.
The ELS instrument provides electron measurements in the energy range
10 eV - 20 keV. The intrinsic field of view is 4 x 360 degree.
There are 16 sectors each with 22.5 degree resolution. ELS is a
standard top-hat electrostatic analyzer in a very compact design.
The general scientific objectives of ASPERA-4 are to study the solar
wind and atmosphere interaction, and to characterize the plasma and
neutral gas environment in the near-Venus space through energetic neutral
atom (ENA) imaging and in-situ plasma measurements. The specific science
measurements to carry out these goals are:
1. Integral ENA fluxes in the energy range of 0.1 to 60 keV.
Neutral Particle Imager (NPI)
2. Mass/energy resolved neutral hydrogen and oxygen atom spectra in the
energy range of 0.1 to 10 keV. Neutral Particle Detector (NPD)
3. Ion energy/mass/angle resolved spectra in the energy range of 0.01 to
36 keV/q for the main ion components H+, H2+, He+, O+, and for the
group of molecular ions 20 < M/q < ~80; with 4pi steradian coverage.
Ion Mass Analyzer (IMA)
4. Electron spectra in energy range of 10 eV to 20 keV, with up to
4pi steradian coverage. However, due to spacecraft blockage, 4pi
coverage is never really achieved. Electron Spectrometer (ELS)
The ASPERA-4 archived data sets contain data measurements necessary to
satisfy the scientific goals and objectives.
It is a high-level product that gives the electron counts in the
physical unit, namely, the differential flux in the unit of
cm^-2 s^-2 eV^-1 sr^-1.
This dataset also contains documentation which describe the ASPERA-4
experiment, including the acquisition, processing, and quality of the
ASPERA-4 data. Supporting documentation and label files confirm to the
Planetary Data System (PDS) Standards, Version 3.6, Jet Propulsion
Laboratory (JPL) document JPL D-7669.
Look in the DOCUMENT directory for the following:
Instrument Description Document
VE-ASP-TN-060402.PDF - Provides detailed information about the
ASPERA-4 experiment, instrumentation, and data measurements.
Provides also ASPERA-4 information concerning pre-flight testing
and flight performance.
BARABASHP3.PDF - Provides a full scope of the ASPERA-4 science objectives
and detailed information about the experiment.
Geometry Document
VE-ASP-TN-060402.PDF - Provides sensor numbering and frames
information for each of the ASPERA-4 sensors. Provides also
ASPERA-4 frames and geometry information.
Calibration Documents
VE-ASP-TN-060402.PDF - Provides calibration information and
report for the Electron Spectrometer (ELS) instrument.
For more information and detail concerning the organization and
contents of the ASPERA-4 data sets, refer to the ASPERA-4 Experiment
to Archive Interface Control Document (EAICD) found in the DOCUMENT
directory (VEX_ASP_CESR_EAICD_V1_4).
2. Disk Format
This section is not applicable since the data are stored only
electronically.
3. File Formats
The PDS Spreadsheet object is used for the ASPERA-4 data (CSV - Comma
Separated Values), and the data are in ASCII form. Please note that
although the data formats in the CSV files provide for as much accuracy
as possible, this does not mean the instruments (ELS, IMA, NPD, & NPI)
are capable of this much accuracy. However, it is necessary to have
the data accuracy for calibrated data products.
4. CD-ROM Contents
The files on this volumes are organized in one top-level directory
with several subdirectories. The following table shows the structure
and content of these directories. In the table, directory names are
enclosed in square brackets ([]), upper-case letters indicate an actual
directory or file name, and lower-case letters indicate the general
form of a set of directory or file names.
FILE CONTENTS
Top-level directory
|
|-AAREADME.TXT This text file.
|
|-ERRATA.TXT Optional file summarizing the known errors.
|
|-VOLDESC.CAT A description of the contents of this
| volume in a PDS format readable by both
| human and computers.
|
|
|- [CATALOG] A directory containing files that provide
| | a top-level understanding of the mission,
| | spacecraft, instruments, and data sets.
| |
| |-CATINFO.TXT A description of the contents of this
| | directory.
| |
| |-DATASET.CAT ASPERA-4 ELS data set information for the PDS
| | catalog.
| |
| |-INST.CAT ASPERA-4 experiment information for the PDS
| | catalog.
| |
| |-INSTHOST.CAT ASPERA-4 experiment host (i.e.,spacecraft)
| | information for the PDS catalog.
| |
| |-MISSION.CAT Venus Express mission information for the PDS
| | catalog.
| |
| |-PERSON.CAT Personnel information for the PDS catalog
| | (Team and PDS personnel responsible for
| | generating the archive).
| |
| |-REF.CAT References mentioned in other *.CAT files.
| |
| |-RELEASE.CAT Catalog file for the different releases
| |
| |-SOFTWARE.CAT Software information for the PDS catalog.
| | (No software provided)
| |
| |-TARGET.CAT Target information for the PDS catalog.
|
|
|-[DATA] A directory containing VEX/ASPERA-4 ELS
| | instrument data files with associated labels
| |
| |-[TIME PERIOD] Sub-divided into time period directories.
|
|
|-[LABEL] A directory containing include files .FMT
| |
| |-LABINFO.TXT A description of the contents of this
| | directory.
| |
| |-XXXX.FMT All .FMT files referenced by a pointer within
| | each PDS label file
|
|
|-[GEOMETRY] A directory that contains basic cruise
| | information
| |
| |-GEOMINFO.TXT A description of the contents of this
| | directory.
| |
| |-ORB_XXXX.LBL The label for the corresponding ORB_XXXX.TAB
| | file
| |
| |-ORB_XXXX.TAB Spacecraft orbit/attitude calculated for
| | several time period
| |
| |-ORB.FMT ORB.FMT file referenced by a pointer within
| | each ORB_XXXX.LBL file
|
|-[DOCUMENT] A directory that contains documentation
| | to help the user understand and use the
| | archive data.
| |
| |-DOCINFO.TXT A description of the contents of this
| | directory.
| |
| |-VEX_ASP_CESR_EAICD_V1_4.LBL
| | The label for the Experimenter to Archive ICD.
| |
| |-VEX_ASP_CESR_EAICD_V1_4.PDF
| | The Adobe PDF file of the experimenter to
| | Archive ICD
| |
| |-VE-ASP-TN-060402.LBL The label for the VEX/ASPERA-4 instrument
| | manual Issue 1.1
| |
| |-VE-ASP-TN-060402.PDF The Adobe PDF file of the VEX/ASPERA-4
| | instrument manual Issue 1.1
| |
| |-BARABASHP3.LBL The label for the ESA_SP-1295 paper.
| |
| |-BARABASHP3.PDF The Adobe PDF file of the VEX/ASPERA-4
| | scientific objectives and instrument
| | description. Paper published at ESA Science
| | publication, ESA_SP-1295,2007.
| |
| |-ASPERA4-L1-061016.LBL The label for the L1 VEX/ASPERA-4 data
| | description
| |
| |-ASPERA4_L1-061016.PDF The Adobe PDF file of the L1 VEX/ASPERA-4 data
| | description
| |
| |-ASPERA4_DESC.TXT Description of the ASPERA-4 instruments
| | flying onboard the Venus Express spacecraft
| |
| |-ASPERA4_DESC.LBL PDS label for the instrument description
| | file
| |
| |-VEX_POINTING_MODE_DESC.LBL
| | The label for the description of the
| | pointing mode conventions
| |
| |-VEX_POINTING_MODE_DESC.TXT
| | Text file describing the pointing mode
| | conventions
| |
| |-VEX_ORIENTATION_DESC.LBL
| | The label for the description of the
| | spacecraft orientation
| |
| |-VEX_ORIENTATION_DESC.TXT
| | Text file describing the spacecraft
| | orientation
| |
| |-VEX_SCIENCE_CASE_ID_DESC.LBL
| | The label for the description of the science
| | case of VEX
| |
| |-VEX_SCIENCE_CASE_ID_DESC.TXT
| | Text file describing the science case of VEX
| |
| |-VEX-SCIOPS-TN-050.LBL
| | The label for the VEX mission calendar file
| |
| |-VEX-SCIOPS-TN-050.PDF
| | The Adobe PDF file of the VEX mission
| | calendar Issue 1.0
| |
| |-VEX_RSSD_LI_009.LBL
| | The label for the VEX mission subphases
| | index table
| |
| |-VEX_RSSD_LI_009.TAB
| | The index table of the VEX mission subphases
| | Issue 2.0. This table is mentioned in EAICD.
| |
| |-OBSERVATION_TYPE_DESC.LBL
| | The label for the description of the
| | observation types of VEX
| |
| |-OBSERVATION_TYPE_DESC.TXT
| | Text file describing the observation types
| | of VEX
| |
| |-ELS_DATA_ANALYSIS_SUMMARY.LBL
| | The label for the ELS calibrations reports
| |
| |-ELS_DATA_ANALYSIS_SUMMARY.PDF
| | The Adobe PDF file of the ELS calibrations
| | reports
|
|
|-[INDEX] A directory containing index files which
| | describe products published so far or on
| | this volume.
| |
| |-GEO_VENUS.LBL A PDS detached label that describes
| | GEO_VENUS.TAB
| |
| |-GEO_VENUS.TAB The geometrical index file
| |
| |-INDEX.LBL A PDS detached label that describes
| | INDEX.TAB.
| |
| |-INDEX.TAB A table listing all data products on this
| | volume.
| |
| |-INDXINFO.TXT A description of the contents of this
| | directory.
|
5. Recommended CD-ROM Drives and Driver Software
This section is not applicable since the data are stored only
electronically.
6. Errata and Disclaimer
A cumulative list of anomalies and errors will be maintained in the file
ERRATA.TXT at the root directory of this volume. This file will not be
available if no errors are known.
Although considerable care has gone into making this volume, errors are
both possible and likely.
Users of the data are advised to exercise the same caution as they would
when dealing with any other unknown data set.
Reports of errors or difficulties would be appreciated. Please contact
one of the persons listed herein.
7. Whom to Contact for Information
For any PSA related issues:
PSA Helpdesk: psahelp@rssd.esa.int
ASPERA-4 PI: Dr. Yoshifumi Futaana
Swedish Institute of Space Physics (IRF), Kiruna, Sweden
email: stas@irf.se