33 citations · 68 across the 6 of their papers we have counts for
6 papers
A Modified Multi-Level Tracking Scheme for the Detection of Sunspot Umbral Dots
Rohan Eugene Louis, Amit Chaturvedi
Umbral dots (UDs) are small-scale convective intrusions in the umbral core of sunspots and pores. Different methods have been used in the past to determine the physical properties…
A Statistical Study of delta-Sunspots from Solar Cycle 23 to 25
Rohan E. Louis
Sunspots or active regions (ARs) with a delta-magnetic configuration are known to be associated with strong eruptions such as flares and mass ejections. This article investigates t…
Inference of magnetic fields in the very quiet Sun
M. J. Mart\' inez González, A. Pastor Yabar, A. Lagg +29
We present high-precision spectro-polarimetric data with high spatial resolution (0.4) of the very quiet Sun at 1.56m obtained with the GREGOR telescope to shed some light o…
Probing deep photospheric layers of the quiet Sun with high magnetic sensitivity
A. Lagg, S. K. Solanki, H. -P. Doerr +31
Context. Investigations of the magnetism of the quiet Sun are hindered by extremely weak polarization signals in Fraunhofer spectral lines. Photon noise, straylight, and the system…
Near-infrared spectropolarimetry of a delta-spot
H. Balthasar, C. Beck, R. E. Louis +2
Sunspots harboring umbrae of both magnetic polarities within a common penumbra (delta-spots) are often but not always related to flares. We present first near-infrared (NIR) observ…
The magnetic configuration of a delta-spot
Horst Balthasar, Christian Beck, Rohan E. Louis +2
Sunspots, which harbor both magnetic polarities within one penumbra, are called delta-spots. They are often associated with flares. Nevertheless, there are only very few detailed o…