National Aeronautics and Space Administration

Living With A Star

Targeted Research and Technology

Ionosphere-Thermosphere Variability: The Interaction of Solar Irradiance Changes with Atmospheric Dynamics

ROSES ID: NNH07ZDA001N      Selection Year: 2008      

Program Element: Focused Science Topic

Principal Investigator: Stanley Solomon

Affiliation(s): UCAR/NCAR

Project Member(s):
Marsh, Daniel Robert Co-I National Center for Atmospheric Research
Garcia, Rolando R Collaborator NCAR
Kane, Tim Collaborator Penn State
Bowman, Bruce R Collaborator null
Chamberlin, Phillip C Collaborator NASA
Qian, Liying Co-I UCAR


Understanding the day-to-day variability of the ionosphere and thermosphere requires unraveling the relative strengths of forcing mechanisms of the I-T system, including solar ultraviolet, extreme-ultraviolet, and X-ray fluxes, magnetospheric processes resulting in geomagnetic activity and auroral effects, and propagation of dynamical variations driven by lower atmosphere weather and middle atmosphere tides. The goal of this investigation is to advance understanding of the observed day-to-day variability of the ionosphere-thermosphere using three-dimensional general circulation models, solar measurements, lower atmosphere analyzed temperatures and winds, and space-based measurements of thermosphere and ionosphere density and composition. As part of a focused science team, we will concentrate on solar forcing, including flare effects, and internal dynamics driven by lower atmosphere processes, in creating observed daily variability. We will complete the extended-altitude version of the Whole Atmosphere Community Climate Model that extends from the ground to the thermosphere/ionosphere, and use solar ultraviolet measurements and a measurement-based flare model as optional inputs. We will impose analyzed meteorological fields on the troposphere/stratosphere region of the model in order to study how atmospheric dynamics propagate into space. We will attempt to understand the seasonal behavior of the thermosphere/ionosphere as well, addressing the hypothesis that the lower atmosphere is responsible for variation on time scales ranging from diurnal to inter-annual.


Performance YearReferenceInvestigation TypeActions
1Qian, Liying; Laštovička, Jan; Roble, Raymond G.; S...
not set


Performance YearReferenceActions
1Woods, T. N.; Caspi, A.; Chamberlin, P. C.; Eparvier...

Export to PDF