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Evidence for a Magnetic Flux Rope in Observations of a Solar Prominence-Cavity System

Reeves, Katharine K.; Su, Yingna; Jibben, Patricia R.

Lifecycle of a large-scale polar coronal pseudostreamer/cavity system

Auchère, Frédéric; Rachmeler, Laurel; Seaton, Daniel +1 more

We report on an exceptional large-scale coronal pseudostreamer/cavity system in the southern polar region of the solar corona that was visible for approximately a year starting in February 2014. It is unusual to see such a large closed-field structure embedded within the open polar coronal hole. We investigate this structure to document its format…

Connecting VLBI and Gaia celestial reference frames

Malkin, Zinovy

The current state of the link problem between radio and optical celestial reference frames is considered. The main objectives of the investigations in this direction during the next few years are the preparation of a comparison and the mutual orientation and rotation between the optical Gaia Celestial Reference Frame (GCRF) and the 3rd generation …