The Jacchia-Bowman 2008 Empirical Thermospheric Density Model

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Welcome to the JB2008 empirical thermospheric density model website. Please provide your name and email address if you desire to be notified about updates to the JB2008 model, and the availability of forecasts.

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NOTICE May 11, 2016: On May 11, 2016 the JB2008 indices were updated to v4.2g. Included in this update are corrections to the S10 index due to degradations in TIMED/SEE and SDO/EVE data that were used to create S10 from 2010 to date. The S10 values starting on January 1, 2010 are now different than the previous version. The S10 index in the 2008-2009 time frame also continues to include an empirical correction that reduces the amount of energy coming into the thermosphere. This correction, though not a solar effect, was required to produce solar minimum thermosphere densities that matched what calibration satellites experienced. The M10, Y10, and F10 indices are unchanged.

Notice: Beginning 6 Oct 2012, JB2008 operations have been upgraded, and the JB2008 indices are now updated regularly at this website (note that most of these data released for public use will have an approximately 40-day lag from the current date). A number of significant improvements have been made to the JB2008 indices, which have been validated with 2001 and 2005 solar/geomagnetic data. For more information, contact spacenvironment@spacenvironment.net with "JB2008" in the subject line.

Last Website Update: 6 Oct 2012


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