High-resolution (HR) ground-based spectrographs have drastically improved the investigation of exoplanet atmospheres. In this scenario the near-infrared (0.9-2...
The Ring Nebula as a laboratory for the interaction of molecules, PAHs and dust in strong UV radiation fields
We propose to observe the Ring Nebula, NGC 6720, at unprecedented spatial resolution and spectral sensitivity using MIRI, NIRSpec and NIRCam, with the aim of...
The Rise of Magnetic Flux Tubes across a Stratified Medium: Effects of the Twist
The results of a 2D numerical simulation of the rise of twisted magnetic flux tubes are sketched. The theoretical criterion for the minimum twist necessary to...
The role of activity complexes in the distribution of solar magnetic fields.
Using published data on the large-scale distribution of solar activity, the authors conclude that the longlived coronal holes are formed and maintained by the...