The Spectrometer/Telescope for Imaging X-rays (STIX) is the HXR instrument onboard Solar Orbiter designed to observe solar flares over a broad range of flare sizes, between 4-150 keV. We report first STIX observations microflares recorded during commissioning phase in order investigate performance at its detection limit. This result paper focuses on temporal and spectral evolution occuring AR12...

The source-frequency phase-referencing (SFPR) technique has been demonstrated to have great advantages for mm-VLBI observations. By implementing simultaneous multi-frequency receiving systems on the next-generation Event Horizon Telescope (ngEHT) antennas, it is feasible carry out a frequency phase transfer (FPT) which could calibrate non-dispersive propagation errors and significantly increase...