Bibliography

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Found 14 entries in the Bibliography.

Showing entries from 1 through 14

2018

Development and Validation of the Whole Atmosphere Community Climate Model With Thermosphere and Ionosphere Extension (WACCM-X 2.0)

Key developments have been made to the NCAR Whole Atmosphere Community Climate Model with thermosphere and ionosphere extension (WACCM-X). Among them, the most important are the self-consistent solution of global electrodynamics, and transport of O⁺ in the F-region. Other ionosphere developments include time-dependent solution of electron/ion temperatures, metastable O⁺ chemistry, and high-cadence solar EUV capability. Additional developments of the thermospheric components are improvements to the momentum and energy equation solvers to account for variable mean molecular mass and specific heat, a new divergence damping scheme, and cooling by O(³P) fine structure. Simulations using this new version of WACCM-X (2.0) have been carried out for solar maximum and minimum conditions. Thermospheric composition, density, and temperatures are in general agreement with measurements and empirical models, including the equatorial mass density anomaly and the midnight density maximum. The amplitudes and seasonal variations of atmospheric tides in the mesosphere and lower thermosphere are in good agreement with observations. Although global mean thermospheric densities are comparable with observations of the annual variation, they lack a clear semiannual variation. In the ionosphere, the low-latitude E \texttimes B drifts agree well with observations in their magnitudes, local time dependence, seasonal, and solar activity variations. The prereversal enhancement in the equatorial region, which is associated with ionospheric irregularities, displays patterns of longitudinal and seasonal variation that are similar to observations. Ionospheric density from the model simulations reproduces the equatorial ionosphere anomaly structures and is in general agreement with observations. The model simulations also capture important ionospheric features during storms.

Liu, Han-Li; Bardeen, Charles; Foster, Benjamin; Lauritzen, Peter; Liu, Jing; Lu, Gang; Marsh, Daniel; Maute, Astrid; McInerney, Joseph; Pedatella, Nicholas; Qian, Liying; Richmond, Arthur; Roble, Raymond; Solomon, Stanley; Vitt, Francis; Wang, Wenbin;

Published by: Journal of Advances in Modeling Earth Systems Published on: 01/2018

YEAR: 2018 DOI: 10.1002/jame.v10.210.1002/2017MS001232

2014

The NCAR TIE-GCM: A community model of the coupled thermosphere/ionosphere system

Qian, Liying; Burns, Alan; Emery, Barbara; Foster, Benjamin; Lu, Gang; Maute, Astrid; Richmond, Arthur; Roble, Raymond; Solomon, Stanley; Wang, Wenbin;

Published by: Modeling the Ionosphere-Thermosphere System Published on:

YEAR: 2014 DOI:

2012

Parameterization of the ion convection and the auroral oval in the NCAR thermospheric general circulation models

Emery, B; Roble, Raymond; Ridley, Cicely; Richmond, Arthur; Knipp, Delores; Crowley, Geoff; Evans, David; Rich, Frederick; Maeda, Sawako;

Published by: NCAR Tech. Note NCAR/TN-491+ STR Published on:

YEAR: 2012 DOI:

2011

Progress in observations and simulations of global change in the upper atmosphere

Qian, Liying; La\vstovi\vcka, Jan; Roble, Raymond; Solomon, Stanley;

Published by: Journal of Geophysical Research: Space Physics Published on:

YEAR: 2011 DOI:

2010

Mesospheric Impact on Thermosphere and Ionosphere

Wu, Qian; Roble, Raymond; Foster, Benjamin;

Published by: 38th COSPAR Scientific Assembly Published on:

YEAR: 2010 DOI:

2008

A data-model comparative study of ionospheric positive storm phase in the midlatitude F region

Lu, G; Goncharenko, LP; Coster, AJ; Richmond, AD; Roble, RG; Aponte, N; Paxton, LJ;

Published by: Published on:

YEAR: 2008 DOI:

2007

A climatology of nonmigrating semidiurnal tides from TIMED Doppler Interferometer (TIDI) wind data

Oberheide, J.; Wu, Q.; Killeen, T.L.; Hagan, M.E.; Roble, R.G.;

Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: Jan-12-2007

YEAR: 2007 DOI: 10.1016/j.jastp.2007.05.010

2006

Global thermosphere-ionosphere response to onset of 20 November 2003 magnetic storm

Crowley, G.; Hackert, C.; Meier, R.; Strickland, D.; Paxton, L.; Pi, X.; Mannucci, A.; Christensen, A.; Morrison, D.; Bust, G.; Roble, R.; Curtis, N.; Wene, G.;

Published by: Journal of Geophysical Research Published on: Jan-01-2006

YEAR: 2006 DOI: 10.1029/2005JA011518

Effect of IMF By on thermospheric composition at high and middle latitudes: 2. Data comparisons

Immel, Thomas; Crowley, Geoff; Hackert, Chris; Craven, John; Roble, Ray;

Published by: Journal of Geophysical Research: Space Physics Published on:

YEAR: 2006 DOI:

The effects of mid and low latitude electric fields upon the ionosphere and magnetosphere

Garner, TW; Crowley, G; Richmond, A; Roble, RG;

Published by: Published on:

YEAR: 2006 DOI:

Effect of IMF BY on thermospheric composition at high and middle latitudes: 1. Numerical experiments

Magnetic storms and their effects on the thermosphere and ionosphere have been studied for many years, yet there are many aspects of the thermospheric and ionospheric responses that are not understood. The purpose of this paper is to show how the high-latitude composition depends on the sign of the IMF BY component, using controlled simulations with a global first principles model. Because the high-latitude convection and neutral wind systems are strongly controlled by the IMF BY component, it seems likely that the compositional response that is driven by high-latitude forcing should also be sensitive to the BY component. To date, no first-principles modeling has been performed to test the idea of IMF BY effects on composition. Numerical experiments using model simulations provide insight into this important scientific question, since the thermospheric compositional response to the convection patterns for different IMF BZ and BY can be studied in isolation in a model. In this paper we use a first-principles model to determine the effect of the IMF BY component on the compositional response of the high-latitude thermosphere. We show for the first time that a clockwise rotation of the potential pattern resulting from a change from BY-negative to BY-positive drives a corresponding rotation in the wind, neutral density, and composition distributions. BY control of thermospheric composition has been invoked in the literature to explain an apparent variability in the effectiveness of auroral activity in causing thermospheric storm effects at middle latitudes, as observed in global images of the far-ultraviolet (FUV) OI 130.4-nm emission from the DE-1 auroral imager. However, the effect in the simulations presented here is opposite from that suggested by earlier work based on DE data, indicating another explanation must be sought for the DE results. These simulations are highly relevant for interpreting data being provided by more modern UV imaging instruments on the DMSP, TIMED, and IMAGE satellites.

Crowley, G.; Immel, T.; Hackert, C.; Craven, J.; Roble, R.;

Published by: Journal of Geophysical Research: Space Physics Published on:

YEAR: 2006 DOI: https://doi.org/10.1029/2005JA011371

composition; thermospheric

2005

Global Thermosphere-Ionosphere Response to Geomagnetic Storms

Crowley, G.; Hackert, C.; Meier, R.; Strickland, D.; Paxton, L.; Pi, X.; Manucci, A.; Christensen, A.; Morrison, D.; Bust, G.; Roble, R.; Curtis, N.;