PDS_VERSION_ID = PDS3
RECORD_TYPE = STREAM
RELEASE_ID = 0001
REVISION_ID = 0000
INSTRUMENT_HOST_NAME = "MARS EXPRESS"
INSTRUMENT_HOST_ID = "MEX"
MISSION_NAME = "MARS EXPRESS"
OBJECT = TEXT
PUBLICATION_DATE = 2005-05-31
NOTE = "MEX ASPERA-3 STANDARD DATA ARCHIVE"
END_OBJECT = TEXT
END
MEX ASPERA-3 STANDARD DATA ARCHIVE
1. Overview
==============================================================================
This archive contains data from the Electron Spectrometer (ELS)
component of the ASPERA-3 instrument from the Mars Express mission.
The ELS instrument provides electron measurements in the energy range
0.05 eV - 20 keV. The intrinsic field of view is 10 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-3 are to study the solar
wind and atmosphere interaction, and to characterize the plasma and
neutral gas environment in the near-Mars 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 100 keV. Neutral Particle Detector (NPD)
3. Ion energy/mass/angle resolved spectra in the energy range of 0.01 to
40 keV; 1-106 atomic mass units per unit charge (amu/q); with 4pi
steradian coverage. Ion Mass Analyzer (IMA)
4. Electron spectra in energy range of 0.05 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-3 archived data sets contain data measurements necessary to
satisfy the scientific goals and objectives.
Getting Started:
----------------
For more information and detail concerning the organization and
contents of the ASPERA-3 data sets, refer to the ASPERA-3 Experiment
to Archive Interface Control Document (EAICD) found in the DOCUMENT
directory (MEX_ASPERA3_PSA_ICD_V01_03).
The ASPERA3_ELS_EDR_DS.CAT file found in the CATALOG directory
provides the Electron Spectrometer (ELS) raw (cnts/accum) data
set description.
Look in the DOCUMENT directory for the following:
Instrument Description Documents
ASPERA3_MEX_EXP.PDF - Provides detailed information about the
ASPERA-3 experiment, instrumentation, and data measurements.
ASPERA3_FLIGHT_PERF.PDF - Provides additional ASPERA-3 information
concerning pre-flight testing and flight performance.
Geometry Documents
ASPERA3_SENSOR_FRAMES.PDF - Provides sensor numbering and frames
information for each of the ASPERA-3 sensors.
ASPERA3_SENSOR_GEOMETRY.TXT - Provides ASPERA-3 frames and
geometry information. The information in this text document
was taken from the Mars Express Frames Kernel (FK) and the
ASPERA-3 Instrument Kernel (IK). A code example (in C and
FORTRAN) is provided (at the bottom) to determine view
directions of each of the ASPERA-3 sensors.
Calibration Documents
ELS_CALIBRATION_REPORT.PDF - Provides calibration information and
report for the Electron Spectrometer (ELS) instrument.
2. Online Deliveries and Data Releases
==============================================================================
The ASPERA-3 data files and labels are organized onto logical archive
e-volumes (electronic volumes). A single ASPERA-3 data set (e.g., ELS
EDR, NPI EDR, etc.) for a specified time interval is organized as a
single archive e-volume. The PSA release object/mechanism is used for
archive e-volume generation and submission. This means that each logical
e-volume is a data release since they are for specific time periods. In
other words, a logical archive e-volume is identical to a data set
release. The collection of data set releases comprises the entire data
set (all data for the whole mission). Once the data and files are
generated and organized for a data release, the archive e-volume (or
data set release) is ready for validation. The PSA Volume Validation
(PVV) software tool is used to ensure all files are present and conform
to PSA/PDS standards and to deliver the e-volume to PSA/PDS.
3. File Formats
==============================================================================
The PDS Spreadsheet object is used for the ASPERA-3 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. Applicable Software
==============================================================================
The CSV format is fairly common and can be loadable into Microsoft Excel
or other spreadsheet software. However, Microsoft Excel is limited to
65,536 rows, and most of ASPERA-3 CSV files contain more than 65,536
rows so Microsoft Excel will truncate them. Since the ASPERA-3 CSV files
are in ASCII format, it is recommended to use a text editor to read and
format the data for input to other tools.
5. Whom to Contact for Information
==============================================================================
MEX Project Scientist: Dr. Olivier Witasse
email: owitasse@rssd.esa.int
phone: (31) 71 565 6565 fax: (31) 71 565 4697
smail: Postbus 290, 2200 AG Noordwijk, NL
MEX Archive Manager: Dr. David Heather
e-mail: dheather@rssd.esa.int
phone: (34) 91 81 31 183 fax: (34) 91 81 31 325
smail: ESAC, SRE-OS, PO BOX 78,
E-28691, Villanueva De La Canada, Madrid, Spain
For any PSA related issues:
PSA Helpdesk: psahelp@rssd.esa.int
ASPERA-3 PI: Prof. Rickard Lundin
Swedish Institute of Space Physics (IRF), Kiruna, Sweden
email: rickard@irf.se
Co-PI: Dr. Stas Barabash
Swedish Institute of Space Physics (IRF), Kiruna, Sweden
email: stas@irf.se
Data Manager: Mr. Leif Kalla
Swedish Institute of Space Physics (IRF), Kiruna, Sweden
email: leif@irf.se
Archive Manager: Ms. Sandee Jeffers
Southwest Research Institute (SwRI), San Antonio, TX
email: sjeffers@swri.org
NASA PDS Archivist: Mr. Steve Joy
UCLA-IGPP Los Angeles, CA, 90095-1567
email: sjoy@igpp.ucla.edu
6. Cognizant Persons
==============================================================================
PSA: Dr. David Heather, ESA Planetary Science Archive Manager
and Mars Express Archive Scientist
ESA Space and Technology Center (ESTEC), Noordwijk, Holland
PDS-PPI: Mr. Steve Joy
University of California in Los Angeles (UCLA)
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