HAO Research Highlights

Sun-like activity cycle of HD 81809 binary system in calcium HK emission
October 10, 2018

HD 81809 has one of the highest-quality activity cycles from the sample of stars synoptically observed in the Mount Wilson Observatory HK Project.

Global total TRMM current
October 3, 2018

Peterson et al. (2015) developed an algorithm for estimating the electric field vector at any point above an electrified cloud from passive microwave observations. 

Time and altitude distribution
October 2, 2018

The extension of the neutral atomic Na layer into thermosphere (up to 170 km) was observed in low and high latitudes.

 Schematic view of IRIS
September 15, 2018

The Interface Region Imaging Spectrograph (IRIS) is a NASA Small Explorer mission that provides high-resolution spectra and images of the Sun in the 133–141 nm and 278–283 nm wavelength bands.

Temporal Variations of Kp
September 14, 2018

Observations from lidars and satellites have shown that large temperature increases and decreases occur in the middle and low latitudes of the mesosphere and lower thermosphere (MLT) region during geomagnetic storms.