HAO Research Highlights

Graph depicting measured Doppler frequency shifts
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

Graph depicting Simulated thermosphere and ionosphere temperatures at 300 km in the 1960s
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.

Solar flare effects on magnetospheric convection and ionospheric potential.
June 18, 2021

Solar flares—a sudden eruption of electromagnetic radiation at the Sun—are known to have significant impacts on Earth’s upper atmosphere and ionosphere, but their collective effects on geospace as an integrated system have never been examined.

SW2 amplitude in meridional wind
June 18, 2021

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

Tie-GCM Graphic
May 28, 2021

We conducted observational and modeling studies of thermospheric composition and ionospheric total electron content (TEC) variations during two geomagnetically quiet periods (maximum Kp=1.7) at solar minimum.

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