Bibliography
Notice:
|
Found 12 entries in the Bibliography.
Showing entries from 1 through 12
2022 |
Total Electron Content Variations during an HSS/CIR driven storm at high and middle latitudes Geethakumari, Gopika; Aikio, Anita; Cai, Lei; Vanhamaki, Heikki; Pedersen, Marcus; Coster, Anthea; Marchaudon, Aurélie; Blelly, Pierre-Louis; Haberle, Veronika; Maute, Astrid; Ellahouny, Nada; Virtanen, Ilkka; Norberg, Johannes; Soyama, Shin-Ichiro; Grandin, Maxime; Published by: Published on: mar YEAR: 2022   DOI: 10.5194/egusphere-egu22-8194 |
During geomagnetic storms a large amount of energy is transferred into the ionosphere-thermosphere (IT) system, leading to local and global changes in eg, the dynamics, composition Maute, Astrid; Lu, Gang; Knipp, Delores; Anderson, Brian; Vines, Sarah; Published by: Frontiers in Astronomy and Space Sciences Published on: YEAR: 2022   DOI: 10.3389/fspas.2022.932748 |
2021 |
Progresses and Challenges to specifying the IT system during weak storms Deng, Yue; Heelis, Roderick; Paxton, Larry; Lyons, Larry; Nishimura, Toshi; Zhang, Shunrong; Bristow, Bill; Maute, Astrid; Sheng, Cheng; Zhu, Qingyu; , others; Published by: Published on: |
Equatorial Ionospheric Electrodynamics The low-latitude ionosphere is one of the most dynamic regions of the Earth s upper atmosphere. The morphology of this region is controlled by radiative and coupled chemical, neutral, and plasma transport processes. Equatorial electrodynamics plays a fundamental role on the low-latitude plasma density, total electron content (TEC), and plasma structures and waves extending from the E-region to the protonosphere. Ground-based and satellite measurements over the last six decades determined the climatology of quiet- and storm-time equatorial electrodynamic processes. Extensive theoretical and numerical simulations, particularly in the last two decades, investigated the main electrodynamic driving mechanisms. These combined studies have led to major advances in the understanding of the short-term variability of equatorial electrodynamics, which is essential for the accurate forecast of low-latitude ionospheric weather, and its effects on ground- and space-based technological systems. In this work, we review the main properties of low-latitude electrodynamics, focusing on recent results of the equatorial ambient plasma drifts, which are the main drivers of low-latitude ionospheric weather. We also briefly mention some outstanding questions and suggest possible future directions for their more complete understanding. Published by: Published on: YEAR: 2021   DOI: 10.1002/9781119815617.ch9 total electron content; equatorial ionospheric electrodynamics; low-latitude plasma density; quiet-time equatorial plasma drifts; storm-time equatorial electric fields |
2020 |
An outstanding issue in the general circulation model simulations for Earth\textquoterights upper atmosphere is the inaccurate estimation of Joule heating, which could be associated with the inaccuracy of empirical models for high-latitude electrodynamic forcing. The binning methods used to develop those empirical models may contribute to the inaccuracy. Traditionally, data are binned through a static binning approach by using fixed geomagnetic coordinates, in which the dynamic nature of the forcing is not considered and therefore the forcing patterns may be significantly smeared. To avoid the smoothing issue, data can be binned according to some physically important boundaries in the high-latitude forcing, that is, through a boundary-oriented binning approach. In this study, we have investigated the sensitivity of high-latitude forcing patterns to the binning methods by applying both static and boundary-oriented binning approaches to the electron precipitation and electric potential data from the Defense Meteorological Satellite Program satellites. For this initial study, we have focused on the moderately strong and dominantly southward interplanetary magnetic field conditions. As compared with the static binning results, the boundary-oriented binning approach can provide a more confined and intense electron precipitation pattern. In addition, the magnitudes of the electric potential and electric field in the boundary-oriented binning results increase near the convection reversal boundary, leading to a ~11\% enhancement of the cross polar cap potential. The forcing patterns obtained from both binning approaches are used to drive the Global Ionosphere and Thermosphere Model to assess the impacts on Joule heating by using different binning patterns. It is found that the hemispheric-integrated Joule heating in the simulation driven by the boundary-oriented binning patterns is 18\% higher than that driven by the static binning patterns. Zhu, Qingyu; Deng, Yue; Richmond, Arthur; Maute, Astrid; Chen, Yun-Ju; Hairston, Marc; Kilcommons, Liam; Knipp, Delores; Redmon, Robert; Mitchell, Elizabeth; Published by: Journal of Geophysical Research: Space Physics Published on: 01/2020 YEAR: 2020   DOI: 10.1029/2019JA027270 Electric field; high latitude; Joule heating; particle precipitation |
Challenges to understanding the Earth s ionosphere and thermosphere We discuss, in a limited way, some of the challenges to advancing our understanding and description of the coupled plasma and neutral gas that make up the ionosphere and Published by: Journal of Geophysical Research: Space Physics Published on: YEAR: 2020   DOI: 10.1029/2019JA027497 |
2018 |
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 |
Whole Atmosphere Community Climate Model—eXtended Version 2.0 Scientific Description Key developments have been made to the NCAR Whole Atmosphere Community Climate Model with thermosphere and ionosphere extension (WACCM-X). Among them the most Liu, Han-Li; Bardeen, Charles; Foster, Benjamin; Lauritzen, Peter; Liu, Jing; Lu, Gang; Marsh, Daniel; Maute, Astrid; McInerney, Joseph; Pedatella, Nicholas; , others; Published by: Published on: |
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: |
2012 |
Marsal, S.; Richmond, A.; Maute, A.; Anderson, B.; Published by: Journal of Geophysical Research Published on: Jan-01-2012 YEAR: 2012   DOI: 10.1029/2011JA017416 |
Ionospheric and thermospheric variations associated with prompt penetration electric fields Lu, G.; Goncharenko, L.; Nicolls, M.; Maute, A.; Coster, A.; Paxton, L.; Published by: Journal of Geophysical Research Published on: Jan-01-2012 YEAR: 2012   DOI: 10.1029/2012JA017769 |
2010 |
England, S.; Immel, T.; Huba, J.; Hagan, M.; Maute, A.; DeMajistre, R.; Published by: Journal of Geophysical Research Published on: Jan-01-2010 YEAR: 2010   DOI: 10.1029/2009JA014894 |
1