HAO

NCAR High Altitude Observatory

Migrating Semidiurnal Tide during the September Equinox Transition in the Northern Hemisphere

Graphic depicting migrating semidiurnal tide
Thursday, January 28, 2021

Specified Dynamics Whole Atmosphere Community Climate Model with thermosphere-ionosphere eXtension (SD-WACCMX) simulations are used to investigate the solar migrating semidiurnal tide (SW2) around September equinox at middle to high latitudes in the Northern Hemisphere.

Modeling Diurnal Variation Magnetic Fields for Mantle Induction Studies

Graphic image of the magnetic Bx component
Thursday, January 28, 2021

Accurate models of the spatial structure of ionospheric magnetic fields in the daily variation (DV) band (periods of approximately a few hours to a day) would enable use of magneto-variational methods for three-dimensional imaging of upper mantle and transition zone electrical conductivity.

Planetary-scale Wave Impacts on the Venusian Upper Mesosphere and Lower Thermosphere

Graphic image of VTGCM temperature profiles
Wednesday, December 30, 2020

Venus’ atmosphere has a cloud layer (~40 km - ~70 km) that encompasses the whole planet that separates the lower atmosphere and upper atmosphere.

Day-to-Day Variability of Diurnal Tide in the Mesosphere and Lower Thermosphere Driven From Below

Graphic depicting migrating diurnal tidal amplitudes
Wednesday, December 16, 2020

The migrating diurnal tide (DW1) is one of the dominant wave motions in the mesosphere and lower thermosphere. It plays a crucial role in neutral atmosphere and ionosphere coupling. The DW1 can vary over a range of time scales from days to years.

Gravity-wave-perturbed wind shears derived from SABER temperature observations

Graphic depicting wind shear
Wednesday, December 16, 2020

Large wind shears around the mesopause region play an important role in atmospheric neutral dynamics and ionospheric electrodynamics.

Effective vertical diffusion by atmospheric gravity waves

Graphic image depicting effective diffusion coefficient
Wednesday, December 16, 2020

Han-Li Liu has observed that atmospheric gravity waves may transport heat and chemical species in the vertical direction.

Mausumi Dikpati Publication is Featured by AAS Nova

Mausumi Dikpati, senior scientist at HAO

A recent publication by Mausumi Dikpati was featured by AAS Nova in November 2020.

Congratulations to Peter Gilman, elected AAS Legacy fellow!

Peter Gilman, Senior Scientist Emeritus, smiling close up

Senior Scientist Emeritus Peter Gilman has received the newly established Fellow of the American Astronomical Society (AAS) award.

NSF APPROVES FUNDING FOR COSMO

The COSMOS observatory

The National Center for Atmospheric Research (NCAR) has received funding approval to survey prospective locations for the Coronal Solar Magnetism Observatory (COSMO).

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