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.


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).

Alfvénic thermospheric upwelling in a global geospace model

Graphic images from CHAMP satellite
Wednesday, December 2, 2020

First author, William Lotko, reveals that the CHAMP satellite orbiting near 400 km altitude near the magnetic cusp routinely traversed thermospheric density enhancements (up to 50%) that are not predicted by empirical models.


Photographic image of Stan Solomon

Stan Solomon presented a NCAR Explorer Series lecture about how the aurora is formed and varies with the solar wind driver. In this public outreach lecture Stan delves into the physics and chemistry of the ionosphere.

Detecting the Chromospheric Footpoints of the Solar Wind

Graphic image depicting SDO and IRIS full-disk observations
Tuesday, November 24, 2020

Coronal Holes present the source of the fast solar wind. However, the fast solar wind is not unimodal—there are discrete, but subtle, compositional, velocity, and density structures that differentiate different coronal holes as well as wind streams that originate within one coronal hole.


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