Modeling

Efficient Radiative Transfer for Dynamically Evolving Stratified Atmospheres

Static FALC model.
Friday, August 25, 2017

Language Summary or Abstract: We present a fast multi-level and multi-atom non-LTE radiative transfer method for dynamically evolving stratified atmospheres, such as the solar atmosphere. The preconditioning method of Rybicki & Hummer (RH92) is adopted.

Emergence of magnetic flux generated in a solar convective dynamo I

Evolution of the vertical component of the magnetic field
Friday, August 25, 2017

Formation of Sunspots and Active regions, and Origin of Their Asymmetries—We present a realistic numerical model of sunspot and active region formation based on the emergence of flux bundles generated in a solar convective dynamo.

The Global-Scale Observations of the Limb and Disk (GOLD) Mission

Simulation of GOLD atomic oxygen emissions
Monday, August 14, 2017

The NASA Global-scale Observations of the Limb and Disk (GOLD) mission is a dual-channel imaging spectrograph that will be carried on a commercial communications satellite in geostationary orbit. Launch is scheduled for January, 2018.

Thermospheric recovery during the 5 April 2010 geomagnetic storm

TIMED trajectory from SABER measurements (left column) and TIEGCM simulations
Monday, June 12, 2017

Thermospheric temperature and density recovery during the 5 April 2010 geomagnetic storm has been investigated in this study.

Impact of the lower thermospheric winter-to-summer residual circulation on thermospheric composition

TIE-GCM simulated effects
Monday, June 12, 2017

Plain Language Summary or Abstract: Gravity wave forcing near the mesopause drives a summer-to-winter residual circulation in the mesosphere and a reversed, lower thermospheric winter-to-summer residual circulation.

Ionospheric Climatology during Solar Minimum

median hmF2 comparison
Monday, June 5, 2017

In order to calculate the Earth’s whole atmosphere and ionosphere coupled system in a self-consistent way, new ionosphere and electrodynamo modules have been implemented in the thermosphere and ionosphere eXtension of WACCM-X. WACCX-X stands for the Whole Atmosphere Community Climate Model.

Grand Challenge Research on Subauroral Polarization Streams

Joule heating of the ionosphere simulated by the NCAR TIE-GCM

A team from the NCAR High Altitude Observatory, Johns Hopkins University, and Rice University, led by HAO scientist Wenbin Wang, was awarded a prestigious NASA Heliophysics Grand Challenge Research Grant to study the magnetosphere-ionosphere interaction known as subauroral polarization streams.

Variability and predictability of the space environment as related to lower atmosphere forcing

Monthly mean, globally integrated total gravity wave flux of energy
Wednesday, May 31, 2017

Most of the large events affecting the thermosphere and ionosphere part of the space environment come from the Sun, the solar wind, and Earth’s magnetosphere.

Global temperature change

Global temperature change
Wednesday, May 31, 2017

The NCAR Whole Atmosphere Community Climate Model–eXtended (WACCM-X) was used to study global temperature change throughout the atmosphere during the last several decades.

WACCM-X simulation of tidal and planetary wave variability

Teleconnection pattern derived from WACCM-X simulations image
Wednesday, May 31, 2017

This book chapter describes the basic physical processes in the thermosphere, or Earth's neutral upper atmosphere, which need to be captured in a physics-based model. Liu, H., 2014: WACCM-X simulation of tidal and planetary wave variability in the upper atmosphere.

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