Data Set Information
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DATA_SET_NAME |
MARS EXPRESS ASPERA-3 RAW-CAL NTRL PARTICLE IMAGER EXT4 V1.0
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DATA_SET_ID |
MEX-M-ASPERA3-2/3-EDR/RDR-NPI-EXT4-V1.0
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NSSDC_DATA_SET_ID |
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DATA_SET_TERSE_DESCRIPTION |
This data set contains Mars Express ASPERA-3 Neutral Particle Imager (NPI) data for the fourth mission extension (January 1, 2013 - Dec. 31, 2014). The data are provided in units of cnts/sec. Since the NPI instrument accumulation period is 1 second, ...
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DATA_SET_DESCRIPTION |
Overview:
=========
The Neutral Particle Imager (NPI) measures integral ENA fluxes
in the energy range 0.1 to 60 keV to help satisfy the following
scientific objectives:
1. Determine the instantaneous global distributions of plasma
and neutral gas near Mars
2. Energy deposition from the solar wind to the ionosphere
3. Search for the solar wind-Phobos interactions
Parameters:
===========
All NPI data products have the same format and parameters, and
each row (data file record) in the NPI SPREADSHEET data products
has eight (8) COLUMN objects (parameters):
1. Start Time - Begin Date/Time in UTC of data samples
2. Stop Time - Ending Date/Time in UTC of data samples
3. Data Type Name - either SENSOR or MODE. The SENSOR rows are
the NPI science data for each sector (32 sectors). The MODE
rows contains informational data like Accumulation Time and
MCP Mode.
4. Data Type Id - Numeric ID indicating either SENSOR or MODE.
5. Data Name - Short description for data on that row. For
example 'Sector 0' for NPI sector 0 science data (SENSOR
row), or 'Accumulation Time' for informational data (MODE
row).
6. Data Unit - Indicates the data unit (c/sec for SENSOR data,
unitless for MODE data).
7. Values - These are the actual data values. For NPI, there
is one value per row (sector).
8. Data Quality Value - Quality indicator for the data on that
row. See CONFIDENCE_LEVEL_NOTE under 'Data
Coverage/Quality' for valid
values and descriptions.
Data Products:
==============
The only Standard Data Product for the combined NPI PSA Level 1b
(EDR) / PSA Level 2 (RDR) is:
1. NPINORM_C_SEC - Neutral Particle Imager NORMal mode data in
Counts / SECond (count rate).
Ancillary Data:
===============
It is important for ASPERA-3 science studies to know where in
space and time the Mars Express spacecraft and ASPERA-3
instruments are located and what objects (Sun, Mars, Earth,
Phobos, Deimos) are in the fields of views. The ASPERA-3 view
directions for each sensor can be derived using the SPICE kernels
and software. The ASPERA-3 Sensor Frames and Geometry Information
document (in DOCUMENT directory) provides a code example (in C
and FORTRAN) for determining the view directions for the ASPERA-3
sensors.
Coordinate System:
==================
The ASPERA-3 data are always in the instrument reference frame
since data are sampled in situ. The GEOMETRY table contains
spacecraft related parameters expressed in the J2000 reference
frame, and the ASPERA-3 Sensor Frames and Geometry Information
document (in DOCUMENT directory) provides information for
determining the ASPERA-3 sensors view directions and transforming
to the J2000 reference frame.
References:
===========
Refer to the ASPERA-3 Experiment to Archive Interface Control
Document (EAICD) found in the DOCUMENT directory
(MEX_ASPERA3_PSA_ICD_V02_01) for more information and detail
concerning data set formulation and contents.
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DATA_SET_RELEASE_DATE |
2014-01-17T00:00:00.000Z
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START_TIME |
2013-01-01T12:00:00.000Z
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STOP_TIME |
N/A (ongoing)
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MISSION_NAME |
MARS EXPRESS
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MISSION_START_DATE |
1997-10-31T12:00:00.000Z
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MISSION_STOP_DATE |
N/A (ongoing)
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TARGET_NAME |
MARS
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TARGET_TYPE |
PLANET
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INSTRUMENT_HOST_ID |
MEX
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INSTRUMENT_NAME |
ANALYZER OF SPACE PLASMA AND ENERGETIC ATOMS (3RD VERSION)
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INSTRUMENT_ID |
ASPERA-3
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INSTRUMENT_TYPE |
ENERGETIC PARTICLE DETECTOR
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NODE_NAME |
Planetary Plasma Interactions
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ARCHIVE_STATUS |
ARCHIVED - ACCUMULATING
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CONFIDENCE_LEVEL_NOTE |
Review:
=======
These data have been reviewed by the instrument team and are of
the highest quality that can be generated at this time. Science
results based on these data have been published in several
journals (Science, Nature, EGU, etc.). After submission to the
PDS, these data successfully completed the peer review process.
Data Coverage/Quality:
======================
The data quality indicators in the data files for each sensor are
associated with the data returned in telemetry. Valid values
are:
0 - Good Data: Default because assumption is that data
are good unless determined otherwise.
1 - Questionable Data: +30V monitor value is not within
tolerance
2 - Invalid Data: +12V, +5V, or -5V monitor value is not
within tolerance
3 - Bad Data: +30V monitor value and (+12V, +5V, or -5V
monitor value) are not within tolerance
4 - Unknown State: Time related Main Unit housekeeping packet
is not available.
-1 - Data Unavailable: No data returned for the sensor, so a
fill value is used for data quality.
Limitations:
============
There are no known limitations at this time.
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CITATION_DESCRIPTION |
Lundin, R., S. Barabash, D. Winningham, R. Frahm,
MARS EXPRESS ASPERA-3 RAW-CAL NEUTRAL PARTICLE IMAGER V1.0,
MEX-M-ASPERA3-2/3-EDR/RDR-NPI-V1.0,
ESA Planetary Science Archive (PSA),
NASA Planetary Data System (PDS), 2005
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ABSTRACT_TEXT |
This data set contains Mars Express ASPERA-3 Neutral
Particle Imager (NPI) data for the fourth mission extension
(January 1, 2013 - Dec. 31, 2014). These data are provided
in units of count rate (counts/second).
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PRODUCER_FULL_NAME |
SANDEE JEFFERS
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SEARCH/ACCESS DATA |
Planetary Plasma Interactions Website
Mars Express Archives at GEO
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