Document title: Format description for NDADS DE VEFI ac 16 second averaged 
data
Project: DE
NDADS Datatype: VEFI         
Super-EID: DOCUMENT                      
There may be other documents also identified by this super-EID.
NDADS filename: AC16SECAVERFORMAT.SFDU
TRF entry: B46596.txt in NSSDC's controlled digital document library. Feb. 1998.
Document text follows:
----------------------

TYPE_OF_FILE_NAME: VEFI AC 16 second averaged data file.
FILE_ATTRIBUTES: Variable length, unformatted, sequential file
RECORD_LENGTH: 28 words
TYPE_OF_FILE_DESCRIPTION:
This file contains the VEFI AC 16 second averaged data (VEFI ionospheric 
irregularities data base).  This data set is the result of a study
on statistical presentations of the VEFI AC data.  The data included in
this data set was all the VEFI AC data for which microfiche was available
at the time the study was conducted (approximately half of all VEFI AC
data possible); Microfiche browsing was necessary to assure that all data
included in the study were good data.  The data were averaged at 16 second
intervals using the begining of the day as reference and put in a single
file.  Every record in this file contains:  Date and time of the data
in the record (which is the middle time of the 16 second period used in
the average), the 16 second averaged data for each channel of each of the
three spectrometers, and invariant latitude, magnetic local time, geographic
longitude and latitude, altitude, and Kp for the middle time of the 16
second average.

FORMAT_OF_THE_DATA_POINT_RECORD:

  WORD          FIELD                TYPE           VALUE             UNITS
 NUMBER        CONTENTS             VI/VR/          RANGE

   1       Date of the data in      Integer     81227 - 83047      Julian Date
           the record 
 
   2       Time of the data in      Integer     0 - 86400000       Milliseconds
           the record

   3       AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 1
           of spectrometer A
 
   4       AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 2
           of spectrometer A

   5       AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 3
           of spectrometer A

   6       AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 4
           of spectrometer A

   7       AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 5
           of spectrometer A

   8       AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 6
           of spectrometer A

   9       AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 7
           of spectrometer A

   10      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 8
           of spectrometer A

   11      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 1
           of spectrometer B

   12      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 2
           of spectrometer B

   13      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 3
           of spectrometer B

   14      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 4
           of spectrometer B

   15      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 5
           of spectrometer B

   16      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 6
           of spectrometer B

   17      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 7
           of spectrometer B

   18      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 8
           of spectrometer A

   19      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 1
           of spectrometer C

   20      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 2
           of spectrometer C

   21      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 3
           of spectrometer C

   22      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 4
           of spectrometer C

   23      Invariant Latitude       Real        0 - 84.26          Degrees

   24      Magnetic Local Time      Real        0 - 24             Hours

   25      Geographic Longitude     Real        -180 - 180         Degrees

   26      Geographic Latitude      Real        -90  -  90         Degrees

   27      Altitude of the          	Real        0 - 1300           Kilometer
s
           satellite above the 
           spheroid
 
   28      Kp                       	Real        0 - 7              -

Filled data value for all electric field and OA parameters is 9999999.0

FORMAT_APPLY_SCOPE: This format applies to the AC16SECAVER.DAT file 
  under the [AC16SECAVER] subdirectory only.
TYPE_OF_FILE_NAME: VEFI AC 16 second averaged data file.
FILE_ATTRIBUTES: Variable length, unformatted, sequential file
RECORD_LENGTH: 28 words
TYPE_OF_FILE_DESCRIPTION:
This file contains the VEFI AC 16 second averaged data (VEFI ionospheric 
irregularities data base).  This data set is the result of a study
on statistical presentations of the VEFI AC data.  The data included in
this data set was all the VEFI AC data for which microfiche was available
at the time the study was conducted (approximately half of all VEFI AC
data possible); Microfiche browsing was necessary to assure that all data
included in the study were good data.  The data were averaged at 16 second
intervals using the begining of the day as reference and put in a single
file.  Every record in this file contains:  Date and time of the data
in the record (which is the middle time of the 16 second period used in
the average), the 16 second averaged data for each channel of each of the
three spectrometers, and invariant latitude, magnetic local time, geographic
longitude and latitude, altitude, and Kp for the middle time of the 16
second average.

FORMAT_OF_THE_DATA_POINT_RECORD:

  WORD          FIELD                TYPE           VALUE             UNITS
 NUMBER        CONTENTS             VI/VR/          RANGE

   1       Date of the data in      Integer     81227 - 83047      Julian Date
           the record 
 
   2       Time of the data in      Integer     0 - 86400000       Milliseconds
           the record

   3       AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 1
           of spectrometer A
 
   4       AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 2
           of spectrometer A

   5       AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 3
           of spectrometer A

   6       AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 4
           of spectrometer A

   7       AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 5
           of spectrometer A

   8       AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 6
           of spectrometer A

   9       AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 7
           of spectrometer A

   10      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 8
           of spectrometer A

   11      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 1
           of spectrometer B

   12      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 2
           of spectrometer B

   13      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 3
           of spectrometer B

   14      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 4
           of spectrometer B

   15      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 5
           of spectrometer B

   16      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 6
           of spectrometer B

   17      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 7
           of spectrometer B

   18      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 8
           of spectrometer A

   19      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 1
           of spectrometer C

   20      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 2
           of spectrometer C

   21      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 3
           of spectrometer C

   22      AC electric field        Real        0 - 9999999.0      Microvolts/meter
           values for channel 4
           of spectrometer C

   23      Invariant Latitude       Real        0 - 84.26          Degrees

   24      Magnetic Local Time      Real        0 - 24             Hours

   25      Geographic Longitude     Real        -180 - 180         Degrees

   26      Geographic Latitude      Real        -90  -  90         Degrees

   27      Altitude of the          	Real        0 - 1300           Kilometer
s
           satellite above the 
           spheroid
 
   28      Kp                       	Real        0 - 7              -

Filled data value for all electric field and OA parameters is 9999999.0

FORMAT_APPLY_SCOPE: This format applies to the AC16SECAVER.DAT file 
  under the [AC16SECAVER] subdirectory only.