HAO Research Highlights

Temporal variation of the smoothed sunspot number
September 4, 2018

The Sun occasionally goes through Maunder-like extended grand minima when its magnetic activity drops considerably from the normal activity level for several decades. Many possible theories have been proposed to explain the origin of these minima.

GOCE neutral density on dusk side
September 4, 2018

Some recent studies have revealed that the post-storm thermospheric mass density sometime drops below its pre-storm value. This phenomenon has been attributed to the over-cooling effect caused by enhanced infrared emissions from nitric oxide.

COSMIC GPS radio occultation observations
August 28, 2018

Medium-scale ionospheric ionization structures are a persistent global feature of the earth’s ionosphere.

Amplitudes of the Q6DW as a function of latitude and time
August 25, 2018

This study, by Pedatella and others, employs a troposphere to lower thermosphere reanalysis dataset generated by the Whole Atmosphere Community Climate Model with data assimilation provided by the Data Assimilation Research Testbed (WACCM+DART).

MGITM-calculated horizontal distributions
August 24, 2018

Wang and others present a global, time-dependent simulation of the Mars upper atmospheric responses to an X8.2-class solar flare event on 10 September 2017.

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