HAO Research Highlights

A 3D MHD simulation of the eruption of a prominence-carrying coronal flux rope
August 6, 2018

Yuhong Fan and others carry out magnetohydrodynamic (MHD) simulations of the quasi-static evolution and eruption of a twisted coronal flux rope under a coronal streamer built up by an imposed flux emergence at the lower boundary.

Long-lasting response of the global thermosphere and ionosphere
August 5, 2018

Explains Wenbin Wang and others, previous studies have been devoted to examining the ionosphere and thermosphere response during the solar eclipse, but the post-eclipse response of the global ionosphere and thermosphere has not previously been well quantified.

Polar maps of differential TEC
August 4, 2018

It has long been recognized that during solar eclipses, the ionosphere-thermosphere system changes greatly within the eclipse shadow, due to the rapid reduction of solar irradiation.

Measured vector efficiency of an echelle grating
August 1, 2018

Roberto Casini et al report on the measurements of the vector efficiency of a reflective blazed diffraction grating, which was specially coated in order to reduce the level of polarization in the diffracted light.

Broadband fractional polarization Q/I, U/I, and V/I
August 1, 2018

We realized a laboratory experiment to study the polarization of the Na I doublet at 589:3 nm, in the presence of a magnetic eld. The purpose of the experiment is to test the theory of scattering polarization for illumination conditions typical of astrophysical plasmas.