Cohoweb Data Explorer - Near-Earth Heliosphere Data - NSSDC - Goddard Space Flight Center
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Interface to produce averages, standard deviations and, if desired, distribution functions for Voyager1.

This page provides the ability to produce averages, standard deviations and distribution functions for any one of the Voyager1 parameters listed below, only for hours when the value of this parameter and/or other parameters satisfy user-specified numeric ranges. Click on left side to specify the output parameter. Enter in the rightside boxes desired minimum and/or maximum value(s) of this and/or any other desired "filtering" parameter(s).

Voyager magnetometer data past 1989 must be used very carefully due to the very low magnetic field values being measured as compared to the pre-launch magnetometer accuracy requirements. Please click here for details.

Click HERE for more on using this interface.

*Select an activity

     Get distribution function, etc. List data selected

Click here to get time spans for individual parameters.
*Enter start and stop dates (Use yyyyddd or yyyymmdd)  
    Start      Stop

* Select variable
Variable Name Min/Max values (Optional):
Low    High  
Position in HGI
Heliocentric Distance, AU   
HelioGraphic Inertial (HGI) Latitude, deg.   
HGI Longitude, deg.   
Magnetic field, RTN
IMF B Field Magnitude (Scalar), nT   
IMF BR, nT (RTN)   
IMF BT, nT (RTN)   
IMF BN, nT (RTN)   
Plasma, (RTN)
Proton Flow Speed, km/sec   
Proton Flow Elevation Angle/Latitude, (RTN), deg.   
Proton Flow Azimuth Angle/Longitude (RTN), deg.   
Proton Density, n/cc   
Proton Temperature, K   
LECP Proton fluxes (1/(sec-cm**2-ster-MeV)
0.57-1.78 MeV   
3.40-17.6 MeV   
22.0-31.0 MeV   
6-hr CRS Proton fluxes (1/(sec-cm**2-ster-MeV)
3.000-4.600 MeV   
4.600-6.200 MeV   
6.200-7.700 MeV   
7.700-12.800 MeV   
12.800-17.900 MeV   
17.900-30.000 MeV   
30.000-48.000 MeV   
48.000-56.000 MeV   
74.471-83.661 MeV   
132.834-154.911 MeV   
154.911-174.866 MeV   
174.866-187.713 MeV   
187.713-220.475 MeV   
220.475-270.050 MeV   
270.050-346.034 MeV   

* Specify bin size (width) in units natural to selected parameter
Note: Specify zero (0) to suppress the determination and display of a distribution function

*Advanced plot selections (optional)
Y-axes type: Character size(0.5-2.0):
DF units Image size (pixels): X: Y:


If you have any questions/comments about COHOWEB system, 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