Modeling

Predictability of the mesosphere and lower thermosphere based on initialized hindcast experiments

Graph depicting global normalized root mean square error for wavenumbers 0-6
Monday, July 15, 2019

The ability to predict conditions in Earth’s ionosphere and thermosphere is of increasing societal relevance due to the growing dependence on, for example, satellite based communications and navigation (e.g., GPS) systems.

HAO Eclipse Expedition to Cerro Tololo, Chile

MHD models to predict the magnetic structure of the corona at the time of the eclipse

Following its long history of solar eclipse field expeditions, the High Altitude Observatory currently has a team deployed in Cerro Tololo, Chile to conduct solar physics research.

Quantifying Gravity Wave Forcing Using Scale Invariance

Graph depicting Gravity Wave Forcing
Thursday, June 13, 2019

Despite the increasing resolution, forcing on the mean circulation by resolved waves in general circulation models is not yet converging. Parameterization of the forcing remains a major source of model uncertainty.

WACCM-X Publication One of The Top Downloaded

Image of certificate of congratulations for JAMES article

The Journal of Advances in Modeling Earth Systems (JAMES), presented HAO authors, with a certificate of achievement for their WACCM-X paper receiving the most downloads in the 12 months following it's online publication.

MHD simulation of prominence-cavity system

Images of 3D field lines
Thursday, May 9, 2019

We present magnetohydrodynamic simulation of the evolution from quasi-equilibrium to onset of eruption of a twisted, prominence-forming coronal magnetic flux rope underlying a corona streamer. The flux rope is built up by an imposed flux emergence at the lower boundary.

Whole Atmosphere Climate Change: Dependence on Solar Activity

Graph of global simulations
Thursday, May 9, 2019

Solomon and colleagues conducted global simulations of temperature change due to emissions of trace gases due to human activity, that extended from the surface, throughout the atmosphere, to space.

A theoretical study of the responses of mesosphere and lower thermosphere (MLT) winds to geomagnetic storms at middle latitudes

Differences of meridional acceleration terms
Friday, May 3, 2019

In a recent work, we found that, in the mesosphere and lower thermosphere (MLT) region at middle latitudes, adiabatic heating/cooling and vertical heat advection, both associated with vertical wind changes, are the dominant processes that determine the temperature responses to storms.

Trends and Solar Irradiance Effects in the Mesosphere

Monthly mean global average temperatures graph
Friday, March 29, 2019

We investigate trends and solar irradiance effects in the mesosphere using the Whole Atmosphere Community Climate Model with eXtended thermosphere and ionosphere (WACCM‐X) and radar measurements of winds at Collm (51°N, 13°E), for the period of 1980–2014.

The long-term trends of nocturnal mesopause temperature and altitude revealed by the Na lidar observations between 1990 and 2018 at mid-latitude

Graph showing WACCM-X (2.0) simulated summer temperature profiles of year 1974 and year 2003
Sunday, December 2, 2018

The nighttime mesopause, marking the boundary of mesosphere and thermosphere and having the coldest atmospheric temperature, is formed mainly by the combination of radiative cooling by CO2, and the adiabatic flow in the Mesosphere and Lower Thermosphere.

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