63 citations · 192 across the 11 of their papers we have counts for
11 papers
Solar active region evolution and imminent flaring activity through a color-coded visualization of photospheric vector magnetograms
I. Kontogiannis, A. G. M. Pietrow, M. K. Druett +3
The emergence of magnetic flux, its transition to complex configurations, and the pre-eruptive state of active regions are probed using photospheric magnetograms. We aim to pinpoin…
A comparative study of two X2.2 and X9.3 solar flares observed with HARPS-N: Reconciling Sun-as-a-star spectroscopy and high-spatial resolution solar observations in the context of the solar-stellar connection
A. G. M. Pietrow, M. Cretignier, M. K. Druett +14
Stellar flares cannot be spatially resolved, which complicates ascertaining the physical processes behind particular spectral signatures. Due to their proximity to Earth, solar fla…
Characterization of chromospheric activity based on Sun-as-a-star spectral and disk-resolved activity indices
Ekaterina Dineva, Jeniveve Pearson, Ilia Ilyin +4
The strong chromospheric absorption lines Ca H & K are tightly connected to stellar surface magnetic fields. Only for the Sun, spectral activity indices can be related to evolving…
Solar Hα excess during Solar Cycle 24 from full-disk filtergrams of the Chromospheric Telescope
A. Diercke, C. Kuckein, P. W. Cauley +4
The chromospheric H-alpha spectral line is a strong line in the spectrum of the Sun and other stars. In the stellar regime, this spectral line is already used as a powerful tracer…
Classification of High-resolution Solar Hα Spectra using t-distributed Stochastic Neighbor Embedding
Meetu Verma, Gal Matijevič, Carsten Denker +7
The Hα spectral line is a well-studied absorption line revealing properties of the highly structured and dynamic solar chromosphere. Typical features with distinct spectral signatu…
High-resolution spectroscopy of an erupting minifilament and its impact on the nearby chromosphere
I. Kontogiannis, E. Dineva, A. Diercke +4
We study the evolution of a mini-filament eruption in a quiet region at the center of the solar disk and its impact on the ambient atmosphere. We used high-spectral resolution imag…