Document title: Format description for NDADS DE LANG datatype
Project: DE
NDADS Datatype: LANG_ASCII         ***** INAPPROPRIATE DATATYPE *****
Super-EID: DOCUMENT                  *** Data's datatype is LANG ***
There may be other documents also identified by this super-EID.
NDADS filename: LANG_READ_ME_DE.DOC
TRF entry: B46553.txt in NSSDC's controlled digital document library, Feb. 1998.
Document text follows:
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                   DE-2 Langmuir Probe data on NDADS
                   _________________________________

The Dynamics Explorer 2 Langmuir Probe (LANG) ASCII files contain the
following geophysical parameters: electron temperature, plasma density,
and satellite potential.  They also contain the most important DE-2 orbit
parameters.  The geophysical parameters in the ASCII files were derived
from the raw volt-ampere data from LANG.  PI-provided software was used
to convert the raw binary data into the ASCII geophysical data.  For more
on DE-2, LANG, and the binary data and software, see LANG_VOLDESC_DE.SFD.

The LANG daily files are requested with the DATA_TYPE = LANG and the
ENTRY_ID = yyddd and are then staged as yyddd_LANG_DE_500MS_V01.ASC;
yy is the year and ddd is the day of the year.  The date range for the
LANG files is 81215-83049 with most days represented.  

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              Format of yyddd_LANG_DE_500MS_V01.ASC Files
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Each record in the ASCII file contains the following data.

orbit number
date                     (yyddd)
UT                       (ms)
electron temperature     (K)
plasma density           (cm-3)
satellite potential      (volts)
altitude                 (km)
latitude                 (deg)
longitude                (deg)
local solar time         (hr)
local magnetic time      (hr)
L Shell
invariant latitude        (deg)
solar zenith angle       (deg)