Cohoweb Data Explorer - Near-Earth Heliosphere Data - NSSDC - Goddard Space Flight Center
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For Linear Regression Fits (LRF) and scatter plots for single lag (including zero lag) and
for LRF for series of lags, for auto- and cross-correlation functions.

Note: 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.

* Specify Lag Number N: from 0(no lag) to 60;
    [N is number of data points by which Y lags X]

*Select one of three options below
LRF and scatter plot for lag=N
List data selected for lag=N
LRFs for lags from 0 to N with step M:  (M >= N/10)   
      [Step number M is incremental number of data points for successive lags]

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

* Select variable
Variable Name X/Y Axes Format Min/Max values:
Low    High
Heliocentric Distance, AU X    Y    F6.2   
HelioGraphic Inertial (HGI) Latitude, deg. X    Y    F6.1   
HGI Longitude, deg. X    Y    F6.1   
IMF B Field Magnitude (Scalar), nT X    Y    F7.3   
IMF BR in RTN(Radial-Tangential-Normal), nT X    Y    F7.3   
IMF BT, nT (RTN) X    Y    F7.3   
IMF BN, nT (RTN) X    Y    F7.3   
Flow Speed, km/sec X    Y    F6.1   
Proton Flow Elevation Angle/Latitude, (RTN), deg. X    Y    F6.1   
Proton Flow Azimuth Angle/Longitude (RTN), deg. X    Y    F6.1   
Proton Density, n/cc X    Y    F8.5   
Proton Temperature, K X    Y    F8.0   

* Select the fitting method
    No fitting     Delta-Y method(N<30000)

*Advanced plot selections (optional)
View Mode: Character size(0.5-2.0):
Plot Symbol: Symbol Size(0.1-4.0):
Image size (pixels): X: Y: Connect Type:


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