HAO Research Highlights

Graphic depicting continuous wavelet spectra of the sunspot area (SSA)
July 25, 2019

Solar magnetic activity exhibits variations with periods between 1.5–4 years, the so-called quasi-biennial oscillations (QBOs), in addition to the well-known 11-year Schwabe cycles. The solar dynamo is thought to be the responsible mechanism for the generation of the QBOs.

Graph depicting global normalized root mean square error for wavenumbers 0-6
July 15, 2019

The ability to predict conditions in Earth’s ionosphere and thermosphere is of increasing societal relevance due to the growing dependence on, for example, satellite based communications and navigation (e.g., GPS) systems.

Photograph of the MinXSS-2 spacecraft
July 15, 2019

The second Miniature X-ray Solar Spectrometer (MinXSS-2) CubeSat builds on the success of MinXSS-1. The science instrument is more advanced – now capable of greater dynamic range with higher energy resolution.

140 year record of solar filaments
July 1, 2019

We observe the abrupt end of solar activity cycles at the Sun’s Equator by combining almost 140 years of observations from ground and space.

Graphs depicting 2018 HIWIND Thermospheric Wind Observations
June 13, 2019

Daytime thermospheric winds observed by the balloon-borne instrument HIWIND (High altitude Interferometer WIND experiment) during two flights in June 2011 and 2018 from Kiruna (68°N, 20°E), along with simultaneous EISCAT (European Incoherent SCATter radar) ion drift data, are analyzed.

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