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.

First computer model to simulate a realistic solar flare

Image depicting a solar flare or cme

A team of scientists has, for the first time, used a single, cohesive computer model to simulate the entire life cycle of a solar flare.

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.

Transport of Internetwork Magnetic Flux Elements in the Solar Photosphere

Graph of displacement probability distributions
Tuesday, October 23, 2018

The motions of small-scale magnetic flux elements in the solar photosphere can provide some measure of the Lagrangian properties of the convective flow.

A Numerical Investigation on the Thermospheric Sodium Layer

Time and altitude distribution
Tuesday, October 2, 2018

The extension of the neutral atomic Na layer into thermosphere (up to 170 km) was observed in low and high latitudes.

Hanli Liu gives CEDAR Prize Lecture

Hanli Liu-CEDAR Prize Lecture

Hanli Liu gave the CEDAR Prize Lecture on Thursday, June 28th, at the CEDAR Summer Workshop in Santa Fe, New Mexico.

The influence of internal atmospheric variability on the ionosphere response to a geomagnetic storm

Change in WACCMX simulated total electron content (TEC) during a geomagnetic
Monday, June 18, 2018

Nicholas Pedatella notes that geomagnetic storms are an important driver of variability in Earth’s ionosphere, and can have significant societal impacts through the ionosphere’s impact on communications and navigation systems (e.g., GPS).


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