Cassini Magnetometer Raw Bundle - Errata
This file describes any known errors or deficiencies in the data collections within this
bundle.
These data were originally archived in the folliwng PDS Data Set:
CO-E/SW/J/S-MAG-2-REDR-RAW-DATA-V2.0 (https://doi.org/10.17189/1519599)
These data sets were originally archived under PDS3 in the COMAG_0001 volume.
During the migration from PDS3 to PDS4 the following issues were found.
Cassini MAG Configuration Image Data Collection
(urn:nasa:pds:cassini-mag-raw:data-hk-con-hkrate)
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The following products in the collection contain "Nan", infinity and negative infinity values.
99232_MRDCD_HKCONN
99230_MRDCD_HKCONN
00121_MRDCD_HKCONN
00120_MRDCD_HKCONN
08009_MRDCD_HKCONN
08007_MRDCD_HKCONN
08010_MRDCD_HKCONN
08005_MRDCD_HKCONN
08004_MRDCD_HKCONN
08008_MRDCD_HKCONN
08001_MRDCD_HKCONN
08002_MRDCD_HKCONN
08003_MRDCD_HKCONN
08006_MRDCD_HKCONN
07342_MRDCD_HKCONN
07315_MRDCD_HKCONN
07314_MRDCD_HKCONN
07339_MRDCD_HKCONN
07344_MRDCD_HKCONN
07343_MRDCD_HKCONN
07313_MRDCD_HKCONN
07312_MRDCD_HKCONN
07345_MRDCD_HKCONN
07317_MRDCD_HKCONN
07337_MRDCD_HKCONN
07365_MRDCD_HKCONN
07347_MRDCD_HKCONN
07310_MRDCD_HKCONN
07320_MRDCD_HKCONN
07340_MRDCD_HKCONN
07335_MRDCD_HKCONN
07287_MRDCD_HKCONN
07307_MRDCD_HKCONN
07308_MRDCD_HKCONN
07321_MRDCD_HKCONN
07334_MRDCD_HKCONN
07364_MRDCD_HKCONN
07288_MRDCD_HKCONN
07298_MRDCD_HKCONN
07358_MRDCD_HKCONN
07338_MRDCD_HKCONN
07291_MRDCD_HKCONN
07324_MRDCD_HKCONN
07304_MRDCD_HKCONN
07311_MRDCD_HKCONN
07318_MRDCD_HKCONN
07351_MRDCD_HKCONN
07361_MRDCD_HKCONN
07341_MRDCD_HKCONN
07331_MRDCD_HKCONN
07355_MRDCD_HKCONN
07302_MRDCD_HKCONN
07301_MRDCD_HKCONN
07327_MRDCD_HKCONN
07294_MRDCD_HKCONN
07328_MRDCD_HKCONN
07329_MRDCD_HKCONN
07293_MRDCD_HKCONN
07354_MRDCD_HKCONN
07353_MRDCD_HKCONN
07303_MRDCD_HKCONN
07292_MRDCD_HKCONN
07332_MRDCD_HKCONN
07325_MRDCD_HKCONN
07352_MRDCD_HKCONN
07305_MRDCD_HKCONN
07297_MRDCD_HKCONN
07290_MRDCD_HKCONN
07357_MRDCD_HKCONN
07330_MRDCD_HKCONN
07295_MRDCD_HKCONN
07360_MRDCD_HKCONN
07300_MRDCD_HKCONN
07350_MRDCD_HKCONN
07322_MRDCD_HKCONN
07362_MRDCD_HKCONN
07319_MRDCD_HKCONN
07289_MRDCD_HKCONN
07299_MRDCD_HKCONN
07359_MRDCD_HKCONN
07349_MRDCD_HKCONN
07309_MRDCD_HKCONN
07333_MRDCD_HKCONN
07363_MRDCD_HKCONN
07323_MRDCD_HKCONN
07296_MRDCD_HKCONN
07356_MRDCD_HKCONN
07336_MRDCD_HKCONN
07326_MRDCD_HKCONN
07316_MRDCD_HKCONN
07306_MRDCD_HKCONN
Bundle Wide
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The time tag in the data files is provided in a non-standard form of the spacecraft clock
(SCLK). The Cassini SCLK is usually represented as two numbers separated by full stop (.). The
first number is the number of "seconds" since 1958 and the second number represents the number
of 1/256 of a second between seconds. The MAG data records need to be timed to at least
millisecond accuracy. Therefore, the second number in the spacecraft clock has been converted
into milliseconds. In order to reproduce true spacecraft clock, multiply the second part of
the SCLK by 256/1000 and round to the nearest integer.
These data contain persistent noise signals at 0.2, 8, 16 Hz, and associated harmonics. This
noise was not observed during ground testing of the instruments and is anticipated to be
interference arising from the spacecraft. Removal of these signals is at the user's discretion.
Data Coverage and Quality
===============================================================================================
There are routine events that cause data quality problems so chronological listings of them
have been included in the document-mag collection of the Cassini mission bundle:
-calibration activities superimpose calibration data on top of science data and are
documented in SCAS_TIMES.ASC (for more information on calibration activies refer to
'THE CASSINI MAGNETIC FIELD INVESTIGATION' by Dougherty et al in this collection)
-data spikes may be seen at instrument range changes. Range changes are documented in
RANGE_CHANGES.ASC
-mode changes affect which sensors produce instrument data and spikes or rapid changes in
data averaging may be seen at mode changes. The first few packets after the instrument
is unmuted or after Science Packets recommence can be highly or incorrectly averaged.
MODE_CHANGES.ASC lists the times of these events.
-date corruption of the on-board memory (SSR) shown through spurious range changes lasting
only one vector. The times of these corrupted vectors are listed in
SPURIOUS_RANGE_CHANGES.ASC
Data gaps may be instrument related (e.g. a sensor turning on/off) or mission related (e.g.
telemetry downlink problems). The former are documented in MODE_CHANGES.ASC. All mission
related gaps are listed in GAP_FILEs - GAP_FILE_SCI_HK.ASC for science data in the housekeeping
packets and in GAP_FILE_SCI_SD.ASC for science data in the science packets. Instrument related
gaps of less than one day also show up in the GAP_FILES as well as in MODE_CHANGES.ASC
Most of the information in the GAP_FILEs are extracted from packets received reports and so
follow a fixed-width tabular format. Multi-day gaps are not documented in the source listings
and have been added manually with a different format including an explanation of the gap - if
a reason is known.
A more detailed description of the data gaps is included in the data collection
descriptions text files.
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Users are encouraged to provide comments back to the PPI Node of the PDS if errors or
omissions are found either in data or in documentation. Please send comments by e-mail to the
PPI Node PDS Operator:
Email pds_operator@igpp.ucla.edu
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