Acoustic oscillations and dynamo action in the G8 sub-giant EK Eridani
We present further evidence of acoustic oscillations in the slowly rotating overactive G8 sub-giant EK Eri. This star was observed with the 1m Hertzsprung SONG...
Acoustic power absorption and enhancement generated by slow and fast MHD waves. Evidence of solar cycle velocity/intensity amplitude changes consistent with the mode conversion theory
We used long duration, high quality, unresolved (Sun-as-a star) observations collected by the ground based network BiSON and by the instruments GOLF and VIRGO...
Acoustic-gravity wave propagation characteristics in three-dimensional radiation hydrodynamic simulations of the solar atmosphere
There has been tremendous progress in the degree of realism of three-dimensional radiation magneto-hydrodynamic simulations of the solar atmosphere in the past...
Active chromospheric fibril singularity: Coordinated observations from Solar Orbiter, SST, and IRIS
Context. The fine structures of the solar chromosphere, driven by photospheric motions, play a crucial role in the dynamics of solar magnetic fields. Many such...
The Starburst model for radio-quiet Active Galactic Nuclei (AGN) postulates that the activity seen in most AGN is powered solely by young stars and compact...
Active Galactic Nuclei Feedback and the Origin and Fate of the Hot Gas in Early-type Galaxies
A recent determination of the relationships between the X-ray luminosity of the ISM (L X) and the stellar and total mass for a sample of nearby early-type...
Active region asymmetry as a result of the rise of magnetic flux tubes
The magnetic flux tubes that rise across the convection zone to produce active regions are shown to develop a difference in inclination between their preceding...
Active Region Filaments Might Harbor Weak Magnetic Fields
Recent spectropolarimetric observations of active region filaments have revealed polarization profiles with signatures typical of the strong field Zeeman regime...