<http://spdf.sci.gsfc.nasa.gov/pub/data/de/de1/images_sai/mission_analysis_files/00readme.txt>

Dynamics Explorer-1 (DE 1) Spin-Scan Auroral Imager (SAI) Data

This directory contains the binary data for the SAI instrument that flew on the DE 1
spacecraft which was launched on 3 August 1981 into an elliptical orbit with
an altitude range of 570 km to 23 000 km (3.63 Earth radii) and its 
operations ceased in January 1991.

The processed SAI data are available in CDF format in the uv_sai_cdaweb directory above.
Many software packages can read and display CDF data.   

This PI-provided, raw format has header info with pointing data followed by 
encoded sweep data (see SAIDOC document). The software for reading and 
processing the native format are in the zzz_old directory above.
SAI data and information are also available from the SAI project homepage at
        <http://www-pi.physics.uiowa.edu/www/desai/>

FILE_NAMING_CONVENTION:
    The naming convention describes the contents of the image files, as follows:
            yrdayhhmmss_pfm
sample file name:   81270120000_C1F

where characters 1-2  = year
         3-5  = day of year
         6-11 = UT as hhmmss
         12   = '_'
         13   = photometer ID (A,B,C)
         14   = filter number (1-9,A,B,C)
         15   = mirror range (F:full,R:restricted,O:stepping off).

The file names are extended with the following file types:
        .SAI00  standard image production output with all scan 
            line records having a pixel offset of 188 and
            length of 150; minimal post-production processing;
            no manipulation of pixel values

        .SAI10  standard image production output with all scan 
            line records having a pixel offset of 0 and
            including all pixels collected during the scan;
            minimal post-production processing;
            no manipulation of pixel values

        .SAI20  reconstructed Earth-centered images from advanced
            mode operations; pixel offset of -75 and scan 
            line length of 150 pixels; minimal post-production
            processing; no manipulation of pixel values

        .SAI30  recentered image files; scan line record length
            is 150 pixels but the pixel offset is something
            other than 188; minimal post-production processing;
            no manipulation of pixel values


The following are documentation and software:
(1) List of all data files (FILELIST.DAT): sai_filelist_b46579.txt
<http://spdf.gsfc.nasa.gov/pub/documents/old/miscellaeous_documents_from_nssdc/b46579.txt>

(2) Description of the FILELIST.DAT file: sai_filelist_description_b46576.txt
<http://spdf.gsfc.nasa.gov/pub/documents/old/miscellaeous_documents_from_nssdc/b46576.txt>

(3) Description of the data file format (SAIDOC): sai_file_format_b46577.txt
<http://spdf.gsfc.nasa.gov/pub/documents/old/miscellaeous_documents_from_nssdc/b46577.txt>

(4) Description of the software files (SSCDOC): sai_software_b46578.txt
<http://spdf.gsfc.nasa.gov/pub/documents/old/miscellaeous_documents_from_nssdc/b46578.txt>

(5) Software source: nssdc-desai_src.zip and nssdc-desai.tar-gz

(6) IDL display software for CDFs: xsai_idl-1_3.zip

(7) File lists from VMS system: sai_data_listing.txt and SAI_data_listing.zip

(8) All data files in SAI-Data.zip

Keywords: Sun-Earth Connections, space physics, magnetosphere, ionosphere

Updated: 2016 Feb. 24 by Robert.M.Candey@nasa.gov
NASA Official: <mailto:Robert.E.McGuire@nasa.gov>