Nicholas Pedatella

Assimilation of Ionosphere Observations in the Whole Atmosphere Community Climate Model with thermosphere-ionosphere eXtension (WACCMX)

Graphic image of WACCMX+DART experiments
Thursday, July 16, 2020

The Earth’s upper atmosphere impacts a wide range of technologies, including satellite communication and navigation signals. Specification and forecasting of the upper atmosphere are critical for mitigating these effects.

Medium-scale thermosphere perturbations in the bottomside F region in tropical regions

Graphic image of global distribution of gravity wave activity
Saturday, July 1, 2017

Thermospheric gravity waves in the bottomside F region have been proposed to play a key role in the generation of equatorial plasma bubbles (EPB). However, direct observations of such waves have been lacking.

Medium-scale thermosphere perturbations in the bottomside F region in tropical regions

Graphic image of global distribution of gravity wave activity
Saturday, July 1, 2017

Thermospheric gravity waves in the bottomside F region have been proposed to play a key role in the generation of equatorial plasma bubbles (EPB). However, direct observations of such waves have been lacking.

Thermospheric composition O/N2 response to an altered meridional mean circulation during Sudden Stratospheric Warmings observed by GOLD

Graphic image of GOLD O/N2 ratios
Wednesday, February 12, 2020

GOLD measurements provide the first observational proof of model predictions that the break up of the stratospheric polar vortex changes the composition of the thermosphere.

Interhemispheric Coupling Mechanisms in the Middle Atmosphere of WACCM6

Graphic depicting three WACCM realizations
Tuesday, January 7, 2020

Simulations with the Community Earth System Model 2 using the Whole Atmosphere Community Climate Model configuration, known as CESM2(WACCM6), show evidence of dynamical coupling from the high latitudes of the winter middle atmosphere to the tropics and the middle and high latitudes of the summer

Solar Flare Effects on 150-km Echoes Observed Over Jicamarca: WACCM-X Simulations

Figure of 150-km echoes and WACCM-X simulated electron densities during the solar flare
Thursday, October 31, 2019

A puzzling feature of the Earth’s equatorial upper atmosphere is the occurrence of enhanced VHF radar echoes near 150-km altitude. These so-called 150-km echoes have been observed for over 50-years, and occur nearly every day, making them a persistent feature of the equatorial ionosphere.

THE PERSISTENT IONOSPHERIC RESPONSES OVER JAPAN AFTER THE IMPACT OF THE 2011 TOHOKU EARTHQUAKE

Graphic of two-dimensional filtered Global Navigation Satellite System (GNSS) total electron content (TEC) maps
Wednesday, September 11, 2019

Earthquake and tsunami are known to be the source of atmospheric gravity waves that can generate plasma ripples in the space. On March 11, 2011, a magnitude 9.0 earthquake occurred near the east coast of Honshu, Japan, unleashing a savage tsunami to strike offshore of Japan.

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.

Modulations of Ionospheric Solar & Lunar Migrating Tides during the 2009 Stratospheric Sudden Warming by using Global Ionosphere Specification

Image of graph depicting total electron content (TEC)
Wednesday, May 29, 2019

Large‐scale meteorological disturbances like sudden stratospheric warmings (SSWs) are often of interest for the investigation of a variety of mechanisms and processes that link different regions of the Earth's atmosphere across a wide range of altitudes and latitudes.

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