TIEGCM

The Impact of Solar Activity on Forecasting the Upper Atmosphere via Assimilation of Electron Density Data

Geographic latitude and altitude distribution
Friday, August 13, 2021

This study presents a comprehensive comparison of the impact of solar activity on forecasting the upper atmosphere through assimilation of radio occultation (RO)-derived electron density (Ne) into a physics-based model (TIE-GCM) using an ensemble Kalman filter.

Post-midnight O+ Depletions Observed by ICON: Data/Model Comparison

Data/Model Comparison
Wednesday, June 30, 2021

The NASA Ionosphere Connection explorer was launched in October 2019 with the goal of understanding the transition from Earth's atmosphere to space by measuring key quantities at low latitudes.

Variations in thermosphere composition and ionosphere total electron content under ‘geomagnetically quiet’ conditions at solar-minimum

Tie-GCM Graphic
Friday, May 28, 2021

We conducted observational and modeling studies of thermospheric composition and ionospheric total electron content (TEC) variations during two geomagnetically quiet periods (maximum Kp=1.7) at solar minimum.

Investigation of a neutral ‘tongue’ observed by GOLD during the geomagnetic storm on May 11,2019

Latitude-longitude distribution of percentage difference
Tuesday, May 4, 2021

The National Aeronautics and Space Administration Global-scale observations of the Limb and Disk (GOLD) mission observed a unique structure of thermospheric column density ratio of O to N2 (∑O/N2) during a geomagnetic storm on day of year (DOY) 130 (May 10) to DOY 132 in 2019.

Data-Driven Ensemble Modeling of Equatorial Ionospheric Electrodynamics

Graphic depicting root-mean-square difference of the plasma drift
Thursday, February 4, 2021

A Case Study During a Minor Storm Period Under Solar Minimum Conditions: The dayside equatorial ionospheric electrodynamics exhibits strong variability driven simultaneously by highly changeable external forcings that originate from the Sun, magnetosphere, and lower atmosphere.

Modeling Diurnal Variation Magnetic Fields for Mantle Induction Studies

Graphic image of the magnetic Bx component
Thursday, January 28, 2021

Accurate models of the spatial structure of ionospheric magnetic fields in the daily variation (DV) band (periods of approximately a few hours to a day) would enable use of magneto-variational methods for three-dimensional imaging of upper mantle and transition zone electrical conductivity.

Planetary wave (PW) generation in the thermosphere driven by the PW-modulated tidal spectrum

Graphic image of Q6DW zonal wind amplitudes
Thursday, July 16, 2020

The National Center for Atmospheric Research thermosphere-ionosphere-electrodynamics general circulation model (TIE-GCM) is used to conduct numerical experiments that isolate and elucidate a substantial modication of the quasi-6-day wave (Q6DW) above 110 km due to presence of the planetary wave (

Xuguang Cai

Xugang Cai is a postdoctoral fellow II in the High Altitude Observatory at NCAR. He is working on the investigation of the thermosphere and ionosphere by GOLD satellite and numerical models (TIEGCM).

New 2018 HIWIND Thermospheric Wind Observations

Graphs depicting 2018 HIWIND Thermospheric Wind Observations
Thursday, June 13, 2019

Daytime thermospheric winds observed by the balloon-borne instrument HIWIND (High altitude Interferometer WIND experiment) during two flights in June 2011 and 2018 from Kiruna (68°N, 20°E), along with simultaneous EISCAT (European Incoherent SCATter radar) ion drift data, are analyzed.

Subscribe to RSS - TIEGCM