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LANL PLASMA DATA FROM IMP-8 (hourly resolution)

This home page provides access to the IMP-8 hourly resolution data set which was created at SPDF by averaging 2-min resolution solar wind data from the Electrostatic Analyzer instument provided over the years by Los Alamos National Laboratory (LANL). Magnetosheath data were excluded from the 2-min data by LANL.
The ASCII data set is placed at SPDF's anonymous FTP site in directory
At this directory a user can find a description of the data .

Time span 1973-11-06 - 2001-10-21

Please enter your selections and then click on the Submit button.

*Select an activity
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*Enter start and stop dates (Use yyyyddd or yyyymmdd)
    Start      Stop

*Select variables
# of points
Rad. distance (Re), GSE
Latitude (Deg.), GSE
Longitude (Deg.), GSE
Density, N/cm^3
Flow speed, km/s
Flow azimuth (Deg.)
Max Temperature, K
Min Temperature, K
Temperature, K
Pressure tensor, (Deg)
Alpha/Prot ratio
Rel flow speed,km/sec
Rel. angle, (Deg)
Alpha temp./prot temp.

sigma-Rad., Re
sigma-Lat. (Deg.)
sigma-Lon. deg.
sigma-N, N/cm^3
sigma-V, km/s
sigma-Az. V, deg.
sigma-max T, K
sigma-min T, K
sigma T, K
sigma-press., deg
sigma- a/p ratio
sigma- rel speed, km/s
sigma-rel. angle,deg
sigma- alp temp./prot temp

*Advanced plot selections (optional)
Y-axis Scale: Character size(0.5-2.0):
Plot Symbol: Symbol Size(0.1-4.0): Image size (pixels) X: Y:

Logo If you have any questions/comments about the data contact: Dr. Natalia Papitashvili, Mail Code 672, NASA/Goddard Space Flight Center, Greenbelt, MD 20771

NASA Official: Robert Candey (, Head of the Space Physics Data Facility