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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.

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).

Self-consistent modeling of electron precipitation and responses in the ionosphere

The time evolution of height-dependent (a) electron density, (b) ionization rate, (c) Pedersen conductivity, and (d) Hall conductivity at MLT = 6 and magnetic latitude of 60
Monday, June 18, 2018

Stan Solomon et al, dicuss a new modeling capability that self-consistently couples physics-based magnetospheric 18 electron precipitation with its impact on the ionosphere, representing a significant improvement over previous models.

Francis Vitt

Submitted by whawkins on June 11, 2018 - 9:25am

Francis Vitt is a Software Engineer/Programmer in the High Altitude Observatory at NCAR.

Katelynn Greer

Submitted by whawkins on June 6, 2018 - 11:12am

Katelynn Greer is a scientific visitor at the High Altitude Observatory of the National Center for Atmospheric Research.

Nicholas Pedatella

Submitted by whawkins on June 6, 2018 - 10:45am

Nicholas Pedatella is a Scientist I at the High Altitude Observatory of the National Center for Atmospheric Research.

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The National Center for Atmospheric Research is sponsored by the National Science Foundation. Any opinions, findings and conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.