Dependence of solar-wind/magnetosphere/ionosphere coupling on the geomagnetic dipole strength

The stand-off distance Rs image
Friday, November 2, 2012

The possible effects of geomagnetic-field changes over periods of millennia on solar wind/magnetosphere/ionosphere/thermosphere coupling was examined, by altering the strength of the geomagnetic dipole in the Coupled Magnetosphere-Ionosphere-Thermosphere (CMIT) model.

Impact of high-speed streams and co-rotating interaction regions on the thermosphere-ionosphere

Comparison of thermospheric neutral density at 400 km image
Friday, November 2, 2012

Changes in the thermosphere-ionosphere system caused by high-speed streams in the solar wind, and the co-rotating interaction regions they engender, were studied using a combination of CMIT and TIEGCM simulations and data analysis. 

Global ionospheric climatology

NmF2 climatology for 2007 to 2010 in magnetic latitude bins image
Friday, November 2, 2012

Extensive analyses of COSMIC data for 2007–2010 have revealed a number of features concerning seasonal and solar-cycle variation. Low-latitude ionospheric peak density NmF2 was dominated by the semi-annual anomaly, the equatorial anomaly and the annual asymmetry.

Ionospheric storm effects of disturbed electric fields

Sunday, August 12, 2012

A comprehensive modeling investigation of ionospheric and thermospheric variations during a prompt penetration electric field on 9 November 2004.

Solar-flare effects on ionospheric electrodynamics

Tuesday, March 20, 2012

The sudden increase of X-ray and extreme ultra-violet irradiance during flares increases the density of the ionosphere through enhanced photoionization.

Assimilative Mapping of Ionospheric Electrodynamics (AMIE)

The AMIE procedure is an optimally constrained, weighted least-squares fit of electric potential distribution to diverse types of atmospheric observations. Knowledge of these distributions is important in many areas of magnetospheric, ionospheric, and thermospheric physics.

Roble Honored with Bowie Medal

Roble with peers

HAO is privileged to announce that Dr. Ray Roble was awarded the William Bowie Medal. He received AGU’s highest honor for his pioneering research into Earth’s upper atmosphere at this year’s AGU meeting in San Francisco.

Bill Lotko

Bill Lotko has been an HAO affiliate scientist since 2010. He is a professor of Engineering Science at the Thayer School of Engineering at Dartmouth College and is a past interim dean of the school.

Joseph Huba

Joe Huba is a Senior Research Scientist at Syntek Technologies in Virginia, who collaborates with HAO/NCAR on modeling the ionosphere, plasmasphere, and magnetosphere.

NASA Selects GOLD and ICON Missions

NASA Selects GOLD and ICON Missions

NASA has selected two new satellite missions to be built as part of the Heliophysics Explorer Program. The projects will provide space observations to study Earth's ionosphere and thermosphere, and will launch in 2017.


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