Document title: Format description for NDADS DE VEFI dc averaged data
Project: DE
NDADS Datatype: VEFI         
Super-EID: DOCUMENT                      
There may be other documents also identified by this super-EID.
NDADS filename: DCAFORMAT.SFDU
TRF entry B46595.txt in NSSDC's controlled digital document library. Feb. 1998.
Document text follows:
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TYPE_OF_FILE_NAME: DCA FILE
FILE_ATTRIBUTES: Variable length, sequential file
RECORD_LENGTH: 
 A. HEADER_RECORD: 30 bytes
 B. DATA_POINT_RECORD: 79 bytes
TYPE_OF_FILE_DESCRIPTION:
This file contains the VEFI DC averaged data (2 points per second). The first record contains the 
orbit number and the values of the contact potential used for the data segment
contained in the file.  Every record thereafter is a data record containing the
date and time of the data in the record, the DC averaged electric field in
spacecraft coordinates , the integrated potential along the X axis and several orbital parameters for that time.
The time interval between data points is normally 0.5 seconds but gaps may
occurr, using the time tag of every record is recommended.
FORMAT_OF_THE_HEADER_RECORD:

 BYTE            FIELD                 TYPE           VALUE           UNITS
NUMBER          CONTENTS              VI/VR/C         RANGE

2  -  9    Orbit number              ASCII integer    1 - 8577          -
 
11 - 16    Contact potential Ecx     ASCII real       -8 - 4        Millivolts/meter

18 - 23    Contact potential Ecy     ACSII real       -8 - 4        Millivolts/meter
 
25 - 30    Contact potential Ecz     ASCII real       -8 - 4        Millivolts/meter

Record format: 1X,I8,3(1X,F6.2)

FORMAT_OF_THE_DATA_POINT_RECORD:

 BYTE            FIELD                 TYPE           VALUE           UNITS
NUMBER          CONTENTS              VI/VR/C         RANGE

2  -  6    Date of the data in      ASCII integer    81227 -        Julian Date
           the record                                83047

8  - 15    Time of the date in      ASCII integer    0 -            Milliseconds
           the record                                86400000

17 - 23    Ex in spacecraft         ASCII real       -999.99 -      Millivolts/meter
           coordinates                               9999.99

25 - 31    Ey in spacecraft         ASCII real       -999.99 -      Millivolts/meter
           coordinates                               9999.99

33 - 39    Integrated potential     ASCII rea        -999.99 -      Kilovolts
           along the x-axis in                       9999.99      
           spacecraft coordinates

41 - 47    Altitude of the          ASCII real       0 - 1300       Kilometers
           satellite above the 
           spheroid 

49 - 55    Geographic latitude      ASCII real       -90  -  90     Degrees

57 - 63    Geographic longitude     ASCII real       -180 - 180     Degrees

65 - 71    Magnetic local time      ASCII real       0  -  24       Hours

73 - 79    Invariant latitude       ASCII real       0  -  84.26    Degrees


Record format: 1X,I5,1X,I8,8(1X,F7.2)


Filled data value for all OA and electric field parameters is 9999.99.

FORMAT_APPLY_SCOPE: This format applies to all the files under the [DCA] sub-
  directory.

TYPE_OF_FILE_NAME: DCA FILE
FILE_ATTRIBUTES: Variable length, sequential file
RECORD_LENGTH: 
 A. HEADER_RECORD: 30 bytes
 B. DATA_POINT_RECORD: 79 bytes
TYPE_OF_FILE_DESCRIPTION:
This file contains the VEFI DC averaged data (2 points per second). The first record contains the 
orbit number and the values of the contact potential used for the data segment
contained in the file.  Every record thereafter is a data record containing the
date and time of the data in the record, the DC averaged electric field in
spacecraft coordinates , the integrated potential along the X axis and several orbital parameters for that time.
The time interval between data points is normally 0.5 seconds but gaps may
occurr, using the time tag of every record is recommended.
FORMAT_OF_THE_HEADER_RECORD:

 BYTE            FIELD                 TYPE           VALUE           UNITS
NUMBER          CONTENTS              VI/VR/C         RANGE

2  -  9    Orbit number              ASCII integer    1 - 8577          -
 
11 - 16    Contact potential Ecx     ASCII real       -8 - 4        Millivolts/meter

18 - 23    Contact potential Ecy     ACSII real       -8 - 4        Millivolts/meter
 
25 - 30    Contact potential Ecz     ASCII real       -8 - 4        Millivolts/meter

Record format: 1X,I8,3(1X,F6.2)

FORMAT_OF_THE_DATA_POINT_RECORD:

 BYTE            FIELD                 TYPE           VALUE           UNITS
NUMBER          CONTENTS              VI/VR/C         RANGE

2  -  6    Date of the data in      ASCII integer    81227 -        Julian Date
           the record                                83047

8  - 15    Time of the date in      ASCII integer    0 -            Milliseconds
           the record                                86400000

17 - 23    Ex in spacecraft         ASCII real       -999.99 -      Millivolts/meter
           coordinates                               9999.99

25 - 31    Ey in spacecraft         ASCII real       -999.99 -      Millivolts/meter
           coordinates                               9999.99

33 - 39    Integrated potential     ASCII rea        -999.99 -      Kilovolts
           along the x-axis in                       9999.99      
           spacecraft coordinates

41 - 47    Altitude of the          ASCII real       0 - 1300       Kilometers
           satellite above the 
           spheroid 

49 - 55    Geographic latitude      ASCII real       -90  -  90     Degrees

57 - 63    Geographic longitude     ASCII real       -180 - 180     Degrees

65 - 71    Magnetic local time      ASCII real       0  -  24       Hours

73 - 79    Invariant latitude       ASCII real       0  -  84.26    Degrees


Record format: 1X,I5,1X,I8,8(1X,F7.2)


Filled data value for all OA and electric field parameters is 9999.99.

FORMAT_APPLY_SCOPE: This format applies to all the files under the [DCA] sub-
  directory.