107 citations · 700 across the 39 of their papers we have counts for
33 papers · 1 filter
Vector Magnetic Field associated with an Active Region Filament Observed by SUNRISE III/SCIP in the Ca II 8542 Å Line
Takuma Matsumoto, Yukio Katsukawa, Masahito Kubo +38
We report high-spatial-resolution spectropolarimetric observations spatially associated with a solar filament, obtained with the SUNRISE Chromospheric Infrared spectro-Polarimeter…
Solar flare ribbons structured by uncombed chromospheric loops
L. P. Chitta, E. R. Priest, David Orozco Suárez +33
A part of the magnetic energy released during a flare is transported to the lower atmosphere. High-resolution observations show that flare ribbons, sites of energy deposition at th…
Sunrise III: Instrument, mission, data, and first results
Sami K. Solanki, H. N. Smitha, Andreas Lagg +66
Sunrise III is a stratospheric balloon-borne solar observatory with a 1-m diameter telescope and three post-focus instruments, along with an image stabilisation system, all within…
Quantifying the effect of passband on observations in the Ca II K line
Ajay Kumar Yadav, Theodosios Chatzistergos, Natalie Krivova +33
Full-disk observations of the Sun in the Ca II K line have been carried out since the late 19th century at various observatories worldwide. These long-term records of solar activit…
Mg II h&k spectral line properties computed using 3D radiative transfer in an enhanced network region simulated with the MURaM-ChE code
P. Ondratschek, D. Przybylski, H. N. Smitha +3
The Mg II h&k lines form in the middle to upper chromosphere and are well-suited to study the structure of the chromosphere. However, the details of their formation in the solar ch…
Decoding the Radial Velocity Signatures of Solar Faculae with 3D MHD Simulations
Florian Kröll, Sowmya Krishnamurthy, Alexander Shapiro +8
We model the solar radial velocity (RV) signal induced by faculae, the dominant contributor to RV variability in Sun-like stars. We use a representative case of a facular patch tra…
Reconstruction of annual solar irradiance over the last three millennia
D. Temaj, N. A. Krivova, S. K. Solanki +2
Solar irradiance measurements are limited to the last few decades, requiring reconstructions to assess solar variability on longer timescales and its impact on Earth's climate. We…
Sensitivity of spectral lines to granulation: from the Sun to K-type stars
V. Vasilyev, K. Sowmya, A. I. Shapiro +7
Stellar granulation produces radial-velocity (RV) jitter at the 1 m/s level in Sun-like stars, limiting Earth-analog detection. A route beyond this limit is to weight spectral line…
A stray light analysis for SO/PHI-HRT and an updated comparison of the inferred magnetic field with SDO/HMI
Jonas Sinjan, Tino L. Riethmüller, Achim Gandorfer +6
Context. The High Resolution Telescope of the Polarimetric and Helioseismic Imager on Solar Orbiter (SO/PHI-HRT) operates in an extreme observational environment, observing the Sun…
3D structures of the base of small-scale recurrent jets revealed by Solar orbiter
Xiaohong Li, Sami K. Solanki, Thomas Wiegelmann +7
Solar jets, characterized by small-scale plasma ejections along open magnetic field lines or the legs of large-scale coronal loops, play a crucial role in the dynamics of the solar…
Magnetic properties of orphan penumbrae
J. S. Castellanos Durán, B. Löptien, A. Korpi-Lagg +2
Orphan penumbrae (OPU) are features resembling sunspot penumbrae, but are not connected to an umbra. Here we compare OPUs and sunspot penumbrae, including their filaments. We also…
High flow speeds and transition-region like temperatures in the solar chromosphere during flux emergence
J. Leenaarts, M. van Noort, J. de la Cruz Rodríguez +7
Context: Flux emergence in the solar atmosphere is a complex process that causes a release of magnetic energy as heat and acceleration of solar plasma at a variety of spatial scale…
Magnetograms underestimate even unipolar magnetic flux nearly everywhere on the solar disk
Jonas Sinjan, Sami K. Solanki, Johann Hirzberger +2
We aim to test the reliability of determining the line-of-sight magnetic field from a 3D MHD simulation of a unipolar region. In contrast to earlier similar studies, we consider th…
: A spectropolarimetric inversion code for the coupled inference of atomic line parameters
D. Vukadinović, H. N. Smitha, A. Korpi-Lagg +3
For many transitions, atomic data, such as the oscillator strength (log(gf)) and the central wavelength of the line, are poorly constrained or even unknown. We present and test a n…
The MODEST catalog of depth-dependent spatially coupled inversions of sunspots observed by Hinode/SOT-SP
J. S. Castellanos Durán, N. Milanovic, A. Korpi-Lagg +3
We present a catalog that we named MODEST containing depth-dependent information on the atmospheric conditions inside sunspot groups of all types. The catalog is currently composed…
Correction of atmospheric stray-light in restored slit-spectra
Sudharshan Saranathan, Michiel van Noort, Sami K. Solanki
A long-standing issue in solar ground-based observations has been the contamination of data due to stray light, which is particularly relevant in inversions of spectropolarimetric…
Influence of NLTE effects in Fe I lines on inverted atmosphere II. 6301 A and 6302 A lines formed in 3DNLTE
H. N. Smitha, R. Holzreuter, M. van Noort +1
This paper forms the second part of our study on how the neglect of NLTE conditions in the formation of Fe I 6301.5 A and the 6302.5 A lines influences the atmosphere obtained by i…
No universal connection between the vertical magnetic field and the umbra-penumbra boundary in sunspots
B. Löptien, A. Lagg, M. van Noort +1
Context. It has been reported that the boundary between the umbra and the penumbra of sunspots occurs at a canonical value of the strength of the vertical magnetic field, independe…
A comparison between solar plage and network properties
D. Buehler, A. Lagg, M. van Noort +1
We compare the properties of kG magnetic structures in the solar network and in active region plage at high spatial resolution. Our analysis used six SP scans of the solar disc cen…
Initial features of an X-class flare observed with SUMER and TRACE
T. J. Wang, S. K. Solanki, D. E. Innes +1
A class X1.5 flare started on the solar limb at 00:43 UT on 21 April 2002, which was associated with a CME observed at 01:27 UT by LASCO C2. The coordinated analyses of this flare…
Solar polarimetry in the K I line: A novel possibility for a stratospheric balloon
C. Quintero Noda, G. L. Villanueva, Y. Katsukawa +9
Of the two solar lines, K I and , almost all attention so far has been devoted to the line, as is severely affected by an O atmospheric band. This, howev…
Morphological properties of slender Ca II H fibrils observed by SUNRISE II
R. Gafeira, A. Lagg, Sami K Solanki +12
We use seeing-free high spatial resolution Ca II H data obtained by the SUNRISE observatory to determine properties of slender fibrils in the lower solar chromosphere. In this work…
Estimation of the magnetic flux emergence rate in the quiet Sun from Sunrise data
H. N. Smitha, L. S. Anusha, S. K. Solanki +1
Small-scale internetwork (IN) features are thought to be the major source of fresh magnetic flux in the quiet Sun. During its first science flight in 2009, the balloon-borne observ…
A Tale of Two Emergences: Sunrise II Observations of Emergence Sites in a Solar Active Region
Rebecca Centeno, Julian Blanco Rodriguez, Jose Carlos Del Toro Iniesta +11
In June 2013, the two scientific instruments onboard the second Sunrise mission witnessed, in detail, a small-scale magnetic flux emergence event as part of the birth of an active…