Data Set Overview : This data set contains the NEAR magnetometer (MAG) data for the CRUISE2 phase. The data set begins on 1997-06-28T00:00:00.000 and ends 1998-01-22T23:59:59.999 . The data are raw telemetry data, provided in engineering units, that have been reformatted into FITS file format (NASA Office of Science and Technology (NOST), 100-1.0). In addition to the raw magnetometer data, a calibration file and algorithm are available. This data set is archived as a set of CDROM images as a part of the NEAR EDR volume set.  The data set directory structure is shown below. The first volume of the set is the only volume which contains CATALOG, DOCUMENT and other non-data subdirectories. Subsequent volumes contain only DATA and INDEX subdirectories in order to minimize duplication.  Volume 1 directory structure:  |-CATALOG-- | |-DATA----- | | |-INSTRUMENT-|-CALPAPER--- |-DOCUMENT-| | |-MISSION----|-OVERVIEW--- | |-TECHDIGEST- |-GEOMETRY- | |-INDEX----  Volume 2-n directory structure  |-DATA----- |-INDEX----   Directory Name Description -------------- -------------  CATALOG Templates for the mission, instrument host, instrument, and data set.  DATA Instrument FITS data files and data labels.  DOCUMENT Documentation of the instrument and mission are provided as ASCII text and may also be available in the original PostScript, PDF or MS Word format. Articles from the Johns Hopkins APL Technical Digest are provided for an overview of the NEAR mission. The instrument subdirectory contains documentation describing the instrument and the in flight calibration of instrument data.  GEOMETRY This directory contains only a GEOMINFO.TXT file. A separate GEOMETRY volume contains all of the SPICE kernels in text transfer format for the mission phase and the supporting the supporting documentation.  INDEX INDEX TABLES for this CD and the volume set describing times and key data file parameter values.  -------------------------------------------------------   Parameters : The definitions for the data set parameters and other keywords are given in the file MAGDEFINITIONS.TXT contained in the DOCUMENT/INSTRUMENT subdirectory.   Data : The data are in the form of FITS files with attached FITS headers and detached PDS labels. Files contain all data for one day.   Ancillary Data : GEOMETRY subdirectory is described above.   Media/Format : This data set is released as a CDROM set.   Processing History : The processing history includes no background, noise, geometry or other corrections.

Data Quality Flag : Each data file label includes a quality flag string in the DATA_QUALITY_ID keyword, extracted from the FITS keyword NEAR-008 of the original data label. The fields of this keyword are defined below. Data quality defects flag is raised when there is missing data other fields informational and not quality related. The eight characters of this field are described below.  Definition - Data Quality Index c0 : Data Quality Flag (0:good,1:flagged for quality defects) c1 : Instrument number for FC, CTP and AIU (1 or 2) c2 - c6 : Processing Flags not quality related c7 : CCDS Source (0:VC0, 1:VC1, 2:VC2, 3:VC3)  Review : This data set underwent external peer review within PDS in June, 2000.