NCAR

COSMIC Observation of Stratospheric Gravity Wave and Ionospheric Scintillation Correlation

High S4 occurrence (> 0.2) longitudinal and annual variations from 2010 to 2013
Tuesday, July 13, 2021

A correlation study is performed to investigate possible connections between the stratospheric gravity waves and the ionospheric plasma bubble induced GPS signal scintillations.

Characteristics of small-scale gravity waves in the Arctic winter mesosphere

Histogram of small-scale GWs’ parameters observed by All-sky OH airglow imager at Resolute Bay Observatory
Tuesday, July 13, 2021

Observational datasets in the polar middle atmosphere are extremely valuable for understanding the polar dynamics and coupling between lower and middle atmosphere.

Dynamical Splitting Of A Spot-producing Magnetic Ring In A Nonlinear Shallow-water Model

Snapshots during splitting of a 6-degree toroidal ring into two
Wednesday, June 30, 2021

We explore the fundamental physics of narrow toroidal rings during their nonlinear magnetohydrodynamic evolution at tachocline depths. Using a shallow-water model, we simulate the nonlinear evolution of spot-producing toroidal rings of 6-degree latitudinal width and peak field of 15 kG.

Post-midnight O+ Depletions Observed by ICON: Data/Model Comparison

Data/Model Comparison
Wednesday, June 30, 2021

The NASA Ionosphere Connection explorer was launched in October 2019 with the goal of understanding the transition from Earth's atmosphere to space by measuring key quantities at low latitudes.

Probing the Solar Meridional Circulation using Fourier Legendre Decomposition

Graph depicting measured Doppler frequency shifts
Thursday, June 24, 2021

We apply the helioseismic methodology of Legendre Function Decomposition to 88 months of Dopp- lergrams obtained by the Helioseismic and Magnetic Imager (HMI) as the basis of inferring the depth variation of the mean meridional flow, as averaged between 20 and 60 degrees latitude and in time, in

HIWIND Prepares for a New Zealand Flight in 2022

HiWIND CG1 1st lab setup for New Zealand flight mission

Project scientist, Qian Wu and the HAO engineering team are busy at CG1 1st lab preparing for the HiWIND New Zealand flight anticipated for year 2022. For the first time since the HiWIND 2018 flight, the computer was initiated and the team verified that cables, etc.

Climate Changes in the Upper Atmosphere: Contributions by the Changing Greenhouse Gas Concentrations and Earth's Magnetic Field From the 1960s to 2010s

Graph depicting Simulated thermosphere and ionosphere temperatures at 300 km in the 1960s
Wednesday, June 23, 2021

Previous studies have established the importance of the increasing greenhouse gas concentrations in causing trends in the thermosphere and ionosphere (T-I). Recent work indicates that the changing Earth’s magnetic field is also important.

Great Grandson of Walter & Annie Maunder Thanks HAO

Annie Maunder's birthday book and her formal portrait displayed together

I just wanted to drop you an email to thank you for the recent bio pages for Walter and Annie S D Maunder presented on the UCAR NCAR website. In particular, I’m pleased to see the Elliot and Fry studio portrait being used for Annie.

Predictability of the Mesosphere and Lower Thermosphere during Major Sudden Stratospheric Warmings

SW2 amplitude in meridional wind
Friday, June 18, 2021

Stratosphere sudden warmings (SSWs) are strong disturbances in the high latitude, wintertime, stratospheric polar vortex.

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