Sample template image
WACCM-X simulation of the "April Fools" geomagnetic storm in 2001, showing the global electron column density in units of 10^12 cm^-2. Note the "tongue of ionization" extending out of both the north and south auroral regions into the dayside low-latitudes, and the highly distorted equatorial ionosphere.

The Whole Atmosphere Community Climate Model with thermosphere and ionosphere extension (WACCM-X) is a comprehensive numerical model, spanning the range of altitude from the Earth’s surface to the upper thermosphere.

The scientific goals of the model include studying solar impacts on the Earth atmosphere, couplings between atmosphere layers through chemical, physical and dynamical processes, and the implications of the coupling for the climate and for the near space environment. The development of the model is inter-divisional collaboration that unifies certain aspects of the upper atmospheric modeling of HAO, the middle atmosphere modeling of ACOM, and the tropospheric modeling of CGD, using the NCAR Community Earth System Model (CESM) as a common numerical framework.

More Information:

    • WACCM-X information and tutorials at CESM:


    • Whole Atmosphere Working Group:


    • WACCM at ACOM:


    • Sign up for WACCM-X Mailing list


News and Updates:

    • WACCM-X v. 2.0, with fully-interactive ionosphere, is released as part of the Community Earth System Model, v. 2.0, June 2018.


    • 15-year run of WACCM-X with specified dynamics forcing available for analysis



Recent Workshops and Symposia:

    • Whole Atmosphere Working Group Meeting, Feb. 12–14, 2018


    • WACCM-X Users Group tutorial session at the CEDAR Workshop, June 22, 2017


    • Whole Atmosphere Variability session at the CEDAR Workshop, June 22, 2017


    • Whole Atmosphere Working Group meeting at the CESM Workshop, June 20, 2017


Recent Publications:

WACCM-X Highlights:

Gravity wave drag anomaly
March 16, 2018

Whole Atmosphere Community Climate Model (WACCM) simulations are used to investigate the short-term (30-day) temporal variability in the mid- and high-latitude Southern Hemisphere mesosphere.

 WACCM-X simulations image
February 14, 2018

H.Liu et al. have improved a comprehensive numerical model, the Whole Atmosphere Community Climate Model with thermosphere and ionosphere extension (WACCM-X).

Temperature differences between the eclipse and baseline simulations
February 7, 2018

Joseph McInerney and others, use a computer model called the Whole Atmosphere Community Climate Model - eXtended (WACCM-X v. 2.0) to investigate what happens to the atmosphere from the surface of Earth up to space during the “Great American Eclipse” of 21 August 2017.

Comparisons of hmF2
February 7, 2018

The Whole Atmosphere Community Climate Model with thermosphere and ionosphere extension (WACCM-X) is a numerical model of the

Model calculations
February 2, 2018

Stan Solomon and others have performed the first whole-atmosphere simulations of global change that include the lower atmosphere (0-15 km), middle atmosphere (15-90 km), thermosphere-ionosphere (90-500 km), and all relevant physics and chemistry.