Mars Atmosphere and Volatile EvolutioN (MAVEN)
Solar Wind Electron Analyzer (SWEA)
Calibrated PDS Archive Bundle
LID = urn:nasa:pds:maven.swea.calibrated
Bundle Description
==================
Overview
--------
The swea.calibrated Level 2 Science Data Bundle contains fully calibrated data
in physical units, consisting of energy/angle (3D) distributions, pitch angle
distributions (PADs), and omni-directional energy spectra.
Version History
---------------
Bundle Modification
Version Date Description
------- ------------ ---------------------------------------------------
1.0 2015-06-05 MAVEN Release 1 (2015-06-05)
2.0 2015-08-14 MAVEN Release 2 (Updated Calibration) (2015-08-17)
2.1 2015-11-16 MAVEN Release 3 (2015-11-16)
2.2 2016-02-11 MAVEN Release 4 (2016-02-15)
2.3 2016-05-16 MAVEN Release 5 (2016-05-16): Consists of an incremental
release of SWEA calibrated data, including both Mars
orbital science data and pre-science ops cruise and Mars
approach data. Coverage for the 3D and Spectral data sets
is 2014-03-19 to 2016-02-14. Coverage for the PAD data
sets is limited to when calibrated MAG data are available,
or 2014-10-10 to 2016-02-14.
2.4 2016-08-10 MAVEN Release 6 (2016-08-15): This version is an
incremental release including the initial release of
2015-02-15 to 2015-05-14.
3.0 2016-11-29 MAVEN Release 7 (2016-11-15): This released consists of a
full redelivery of SWEA data going back to the beginning of
the mission, and including the initial release of 2015-05-15
to 2015-08-14. Updates include a new calibration (based upon
in-flight calibrations), improvements to the overall
sensitivity, and to the energy and angular responses,
including corrections for parts of the FOV that are only
partially blocked (clipped) by the spacecraft. Completely
blocked sectors have already been marked as invalid.
3.1 2017-01-27 Added a document describing the changes made in the version 4
data files.
3.2 2017-02-15 MAVEN Release 8 (2017-02-15): This version is an
incremental release including the initial release of
2016-08-15 to 2016-11-14.
3.3 2017-05-16 MAVEN Release 9 (2017-05-15): This version is an
incremental release including the initial release of
2016-11-15 to 2017-02-14.
3.4 2017-07-11 This version included corrections to a 1 second timing error
in the data following the leap second at 2016-12-31T23:59:60
UTC. Coverage is the same as for version 3.3.
3.5 2017-08-09 MAVEN Release 10 (2017-08-15): This version is an incremental
release including the initial release of 2017-02-15 to
2017-05-14.
3.6 2017-11-14 MAVEN Release 11 (2017-11-15): This version is an incremental
release of the data covering 2017-05-15 to 2017-08-14, and
revised versions of the data covering 2016-10-25 to 2017-02-14.
3.7 2018-02-14 MAVEN Release 12 (2018-02-15): This version is an incremental
release including the initial release of 2017-08-15 to
2017-11-14.
3.8 2018-05-09 MAVEN Release 13 (2018-05-15): This version is an incremental
release including the initial release of 2017-11-15 to
2018-02-14.
3.9 2018-08-09 MAVEN Release 14 (2018-08-15): This version is an incremental
release including the initial release of 2018-02-15 to
2018-05-14.
3.10 2018-11-15 MAVEN Release 15 (2018-11-15): This version is an incremental
release including the initial release of 2018-05-15 to
2018-08-14.
3.11 2019-02-11 MAVEN Release 16 (2019-02-15). This version is an incremental
release including the initial release of 2018-08-15 to
2018-11-14.
3.12 2019-09-10 MAVEN Release 18. This is the initial release of data from both
the Release 17 and 18 intervals (covering 2018-11-15 to 2019-05-14),
and includes updates to SWEA processing designed to address the
anomally described in the document SWEA Sporadic Low-Energy
Suppression.
3.13 2019-11-14 MAVEN Release 19 (2019-11-15). This version is an incremental
release including the initial release of 2019-05-15 to
2019-08-14.
3.14 2020-04-23 MAVEN Release 20. This is the initial release of the
data covering 2019-08-15 to 2019-11-14. It also includes minor
updates to the PDS labels (*.xml files) of all previously released
data products. The previously release data have not changed.
3.15 2021-03-31 MAVEN Releases 21-24. This version is an incremental release
covering MAVEN Releases 21 -24, including the initial release
of the data covering 2019-11-15 to 2020-11-14. Due to sporadic
low energy suppression the energy band 3 - 25 eV have been
flagged in the data files in this release. A discussion of this
problem is provided in the Document Collection for this bundle.
Good data in the flagged band will be restored once the SWEA
team develops an algorithm for filtering data in the affected
range.
3.16 2021-05-14 MAVEN Releases 25. This version is an incremental release
covering MAVEN Releases 25, including the initial release
of the data covering 2020-11-15 to 2021-02-14. Due to sporadic
low energy suppression the energy band 3 - 25 eV have been
flagged in the data files in this release. A discussion of this
problem is provided in the Document Collection for this bundle.
Good data in the flagged band will be restored once the SWEA
team develops an algorithm for filtering data in the affected
range.
3.17 2021-08-12 MAVEN Release 26. This version is an incremental release
covering MAVEN Release 26, including the initial release
of the data covering 2021-02-15 to 2021-05-14. Due to sporadic
low energy suppression the energy band 3 - 25 eV have been
flagged in the data files in this release. A discussion of this
problem is provided in the Document Collection for this bundle.
Good data in the flagged band will be restored once the SWEA
team develops an algorithm for filtering data in the affected
range.
3.18 2021-11-12 MAVEN Release 27. This version is an incremental release
covering MAVEN Release 27, including the initial release
of the data covering 2021-05-15 to 2021-08-14. Due to sporadic
low energy suppression the energy band 3 - 25 eV have been
flagged in the data files in this release. A discussion of this
problem is provided in the Document Collection for this bundle.
Good data in the flagged band will be restored once the SWEA
team develops an algorithm for filtering data in the affected
range.
3.19 2022-02-09 MAVEN Release 28. This version is an incremental release
covering MAVEN Release 28, including the initial release
of the data covering 2021-08-15 to 2021-11-14. Due to sporadic
low energy suppression the energy band 3 - 25 eV have been
flagged in the data files in this release. A discussion of this
problem is provided in the Document Collection for this bundle.
Good data in the flagged band will be restored once the SWEA
team develops an algorithm for filtering data in the affected
range. Note: After the initial release, there was a release of a
revised version of the data in this time range (see Version 3.20).
3.20 2022-03-17 MAVEN Release 28, part 2. This version is an incremental release
consisting of a revised version of the data covered by the initial
Release 28 (see Version 3.19). In the initial release, not all of
the in-flight calibrations were complete, and level 2 MAG data
from 2021-10-01 through 2021-10-03 were not yet available. The
revised version is fully calibrated based on level 2 MAG data.
3.21 2022-05-12 MAVEN Release 29 (2022-05-15). This version is an incremental
release including the initial release of 2021-11-15 to 2022-02-22.
3.22 2022-08-31 MAVEN Release 30 (2022-08-15). This version is an incremental
release including the initial release of 2022-02-23 to 2022-05-25.
(Some updates to the bundle were made after 2022-08-15.)
3.23 2022-11-16 MAVEN Release 31 (2022-11-15). This version is an incremental
release including the initial release of 2022-05-26 to 2022-08-15
and the release of updated versions of 2022-05-15 to 2022-05-25.
3.24 2023-02-15 MAVEN Release 32 (2023-02-15). This version is an incremental
release including the initial release of 2022-08-16 to 2022-11-14.
3.25 2023-05-15 MAVEN Release 33 (2023-05-15). This version is an incremental
release including the initial release of 2022-11-15 to 2023-02-14.
3.26 2023-08-13 MAVEN Release 34 (2023-08-15). This version is an incremental
release including the initial release of 2023-02-15 to 2023-05-14.
3.27 2023-11-15 MAVEN Release 35 (2023-11-15). This version is an incremental
release including the initial release of 2023-05-15 to 2023-08-14.
3.28 2024-02-15 MAVEN Release 36 (2024-02-15). This version is an incremental
release including the initial release of 2023-08-15 to 2023-11-14.
4.0 2024-08-01 Part of MAVEN Release 37. This release consists of a full redelivery
of SWEA data going back to 2014-11-15, and including the initial
release of 2023-11-15 to 2024-02-14. Here?s a list of improvements:
(1) Quality flag that identifies the sporadic low-energy anomaly.
Allows data filtering. Data will no longer masked. They will be
provided as is, along with a quality flag.
(2) Decrease deadtime from 2.8 to 1.0 microseconds, based on
in-flight calibrations. This fixes an over-correction of the data
at high fluxes that is present in previous versions.
(3) Updated sensitivity to account for SWIA recalibration.
(4) Secondary electron contamination is estimated for all three
data products. This allows much better estimates of flux, density
and kinetic temperature in the magnetosheath and for auroral
electrons.
(5) Better data sorting at day boundaries. SPEC data are bundled
into groups of 16 spectra and time tagged with the first spectrum
in the group. At a day boundary, some of the spectra in a bundle
belong with the current day and the rest belong with the next day.
The new version now properly sorts SPEC data at day boundaries.
4.1 2024-08-15 MAVEN Release 38 (2024-08-15). This version is an incremental
release including the initial release of 2024-02-15 to 2024-05-14.
Data Processing Notes
=====================
Data Timing Uncertainty
-----------------------
Some of the data files in this bundle may extend beyond the time for which the
Spacecraft Clock (SCLK) drift rate was defined based upon the SPICE MAVEN SCLK
kernel used to process them. As a result the SCLK drift rate may have been
predicted, resulting in small errors in the time (typically less than a few
1/100's seconds). Where this may be the case a note has been included in the
individual PDS product labels.
Bundle Contents
===============
Collections
-----------
This bundle includes the following collections:
* Survey 3D - Energy/angle (3D) distributions in units of differential
energy flux (eV/cm**2 sec ster eV) from SWEA survey data
(LID = urn:nasa.pds:maven.swea.calibrated:data.svy_3d)
* Archive 3D - Energy/angle (3D) distributions in units of differential
energy flux (eV/cm**2 sec ster eV) from SWEA archive data
(LID = urn:nasa.pds:maven.swea.calibrated:data.arc_3d)
* Survey PAD - Pitch angle distributions in units of differential energy
flux (eV/cm**2 sec ster eV) from SWEA survey data
(LID = urn:nasa.pds:maven.swea.calibrated:data.svy_pad)
* Archive PAD - Pitch angle distributions in units of differential energy
flux (eV/cm**2 sec ster eV) from SWEA archive data
(LID = urn:nasa.pds:maven.swea.calibrated:data.arc_pad)
* Survey Spectra - Omni-directional energy spectra in units of differential
energy flux (eV/cm**2 sec ster eV) from SWEA survey data
(LID = urn:nasa.pds:maven.swea.calibrated:data.svy_spec)
* Archive Spectra - Omni-directional energy spectra in units of
differential energy flux (eV/cm**2 sec ster eV) from SWEA archive data
(LID = urn:nasa.pds:maven.swea.calibrated:data.arc_spec)
* Document - Documents related to the swea.calibrated bundle.
(LID = urn:nasa:pds:maven.swea.calibrated:document)
Data File Naming
----------------
Data files in this bundle are named according to the following convention:
mvn_swe_l2_❮desc❯_❮yyyy❯❮mm❯❮dd❯_v❮xx❯_r❮yy❯.cdf
where:
❮desc❯ = A descriptor used to identify the data file type
❮yyyy❯ = 4-digit year of data coverage date
❮mm❯ = 2-digit month of year of data coverage date
❮dd❯ = 2-digit day of month of data coverage date
❮xx❯ = 2-digit software version
❮yy❯ = 2-digit data file version under the specified software version
Key Documents
=============
Mitchell, D.L., MAVEN SWEA PDS Archive SIS - This document describes the
format and content of the Solar Wind Electron Analyzer (SWEA) Planetary
Data System (PDS) data archive. It includes descriptions of the data
products and associated metadata, and the archive format, content, and
generation pipeline.. It is located in the document collection for this
bundle (LID = urn:nasa:pds:maven.swea.calibrated:document).
Contacts
========
This volume was produced for the Planetary Data System (PDS) at the Planetary
Plasma Interactions (PPI) node at the University of California, Los Angeles
(UCLA). The data files were generated by Dr. David Mitchell at the Space
Sciences Laboratory (SSL) at the University of California (Berkeley). The
data were delivered to the PPI node via the MAVEN Science Data Center (SDC)
located at the Laboratory for Atmospheric and Space Physics (LASP) in Boulder,
Colorado. The PDS metadata were generated at the PPI node.
For questions regarding this archive, please contact Mr. Joseph Mafi at the PDS
PPI Node:
Email jmafi@igpp.ucla.edu
Telephone 310-206-6073
For question regarding the data, please contact Dr. David L. Mitchell:
Internet mitchell@ssl.berkeley.edu
Telephone 510-643-1561
For questions regarding PDS Standards or other archives available from the
PDS, please contact PDS Operator at the PDS Engineering Node (at JPL):
Email pds_operator@jpl.nasa.gov
Telephone 818-354-4321
The PDS assumes no legal liability for errors on this archive. All users are
encouraged to verify the correctness of the data prior to submitting any
publications or other work based on these data. Please report errors on this
archive to the PPI of the PDS through contact information provided above.
|