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MESSENGER: NS Derived Data Records

The MESSENGER NS Derived Data Records (DDRs) consist of neutron count rate (NCR) and neutron composition (NCP) data. The NCR data products contain net neutron count rates from the LG1, LG2, and BP sensors and uncertainties from each of these sensors. The NCP data product contains fast and epithermal count rates as a function of latitude, along with simulated count rates for the
cases of no hydrogen and for a thick layer of 100 wt. percent water ice in all radar bright regions. Each DDR is organized as an ASCII table, along with a detached ASCII text PDS label file. The NCR files are grouped in directories by Earth year and month.

The NS DDRs are stored along with the NS Calibrated Data Records (CDRs) on PDS volume MESSNS_2101. Please see below for direct access to the volume.  Only directories pertaining to the DDRs are listed below.  Alternatively, to search the archive for data that meet particular criteria, e.g. time and location, use the Mercury Orbital Data Explorer (ODE).

AAREADME.TXT Introduction to the archive
ERRATA.TXT Notes and errata
CALIB directory Calibration files
CATALOG directory Information about the archive in the PDS Catalog
DATA/DDR directory The NCP files (ns_ddr_ncp.tab/lbl)
DATA/DDR/2015 directory NS NCRs for data acquired from Jan. 1, 2015 through Apr. 30, 2015
DATA/DDR/2014 directory NS NCRs for data acquired from Jan. 1, 2014 through Dec. 31, 2014
DATA/DDR/2013 directory NS NCRs for data acquired from Jan. 1, 2013 through Dec. 31, 2013
DATA/DDR/2012 directory NS NCRs for data acquired from Jan. 1, 2012 through Dec. 31, 2012
DATA/DDR/2011 directory NS NCRs for data acquired from Mar. 26, 2011 through Dec. 31, 2011
DOCUMENT directory Documentation needed to understand the NS CDR/DDR data products
INDEX directory Index of all products in the archive
LABEL directory Files that describe the format of the NS tables
Root directory Top-level directory of the volume

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Curator: Susan Slavney
NASA Official: Raymond E. Arvidson
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