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pro vyhledávání: '"Choudhary, D"'
Autor:
Criscuoli, S., Bertello, L., Choudhary, D. P., DeLand, M., Kopp, G., Kowalski, A., Marchenko, S., Reardon, K., Pevtsov, A. A., Tilipman, D.
Long-term high-cadence measurements of stellar spectral variability are fundamental to better understand stellar atmospheric properties and stellar magnetism. These, in turn, are fundamental for the detectability of exoplanets as well as the characte
Externí odkaz:
http://arxiv.org/abs/2305.07676
Publikováno v:
A&A 662, A25 (2022)
The inverse Evershed flow (IEF) is a mass motion towards sunspots at chromospheric heights. We combined high-resolution observations of NOAA 12418 from the Dunn Solar Telescope and vector magnetic field measurements from the Helioseismic and Magnetic
Externí odkaz:
http://arxiv.org/abs/2203.02702
We present the properties of the inverse Evershed flow (IEF) based on the center-to-limb variation of the plasma speed and loop geometry of chromospheric superpenumbral fibrils in eleven sunspots that were located at a wide range of heliocentric angl
Externí odkaz:
http://arxiv.org/abs/2008.12748
Autor:
Beck, C., Choudhary, D. P.
The inverse Evershed flow (IEF) is an inflow of material into the penumbra of sunspots in the solar chromosphere that occurs along dark, elongated superpenumbral fibrils extending from about the outer edge of the moat cell to the sunspot. The IEF cha
Externí odkaz:
http://arxiv.org/abs/2002.04560
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2D non-LTE modelling of a filament observed in the H_alpha line with the DST/IBIS spectropolarimeter
Publikováno v:
A&A 631, A146 (2019)
We study a fragment of a large quiescent filament observed on May 29, 2017 by the Interferometric BIdimensional Spectropolarimeter (IBIS) mounted at the Dunn Solar Telescope. We focus on its quiescent stage prior to its eruption. We analyse the spect
Externí odkaz:
http://arxiv.org/abs/1910.03607
Autor:
Beck, C., Choudhary, D. P.
We determined the direction and strength of the photospheric and lower chromospheric magnetic field in the umbra and penumbra of a sunspot from inversions of spectropolarimetric observations of photospheric lines at 617\,nm and 1565\,nm, and the chro
Externí odkaz:
http://arxiv.org/abs/1902.04660
Publikováno v:
RAA:2018
We observed a C-class flare at the outer boundary of the super-penumbra of a sunspot. The flare was triggered by an emerging magnetic bipolar region that was obliquely oriented with respect to the super-penumbral fibrils. The flare started due to the
Externí odkaz:
http://arxiv.org/abs/1806.00232
High-resolution imaging spectroscopy in solar physics has relied on Fabry-Perot Interferometers (FPIs) in recent years. FPI systems, however, get technically challenging and expensive for telescopes larger than the 1-m class. A conventional slit spec
Externí odkaz:
http://arxiv.org/abs/1712.07077