56 citations · 426 across the 22 of their papers we have counts for
22 papers
Magnetic fields and plasma heating in the Sun's atmosphere
Philip Judge, Lucia Kleint, Roberto Casini +3
We use the first publically available data from the Daniel K. Inouye Solar Telescope (DKIST) to track magnetic connections from the solar photosphere into the corona. We scrutinize…
DKIST unveils the serpentine topology of quiet Sun magnetism in the photosphere
Ryan J. Campbell, P H. Keys, M. Mathioudakis +9
We present the first quiet Sun spectropolarimetric observations obtained with the Visible SpectroPolarimeter (ViSP) at the m Daniel K. Inouye Solar Telescope (DKIST). We record…
Derivation of Instrument Requirements for Polarimetry using Mg, Fe, and Mn lines between 250 and 290 nm
A. G. de Wijn, P. G. Judge, R. Ezzeddine +1
Judge et al. (2021) recently argued that a region of the solar spectrum in the near-UV between about 250 and 290 nm is optimal for studying magnetism in the solar chromosphere due…
Small Platforms, High Return: The Need to Enhance Investment in Small Satellites for Focused Science, Career Development, and Improved Equity
James Paul Mason, Robert G. Begbie, Maitland Bowen +33
In the next decade, there is an opportunity for very high return on investment of relatively small budgets by elevating the priority of smallsat funding in heliophysics. We've lear…
First Observation of Chromospheric Waves in a Sunspot by DKIST/ViSP: The Anatomy of an Umbral Flash
Ryan J. French, Thomas J. Bogdan, Roberto Casini +2
The Visible Spectro-Polarimeter (ViSP) of the NSF Daniel K. Inouye Solar Telescope (DKIST) collected its Science Verification data on May 7-8, 2021. The instrument observed multipl…
Coronal Densities, Temperatures and Abundances During the 2019 Total Solar Eclipse: The Role of Multi-Wavelength Observations in Coronal Plasma Characterization
G. Del Zanna, J. Samra, A. Monaghan +7
The Airborne Infrared Spectrometer (AIR-Spec) offers an unprecedented opportunity to explore the Near Infra-Red (NIR) wavelength range. It has been flown at two total solar eclipse…
Astro2020 Science White Paper: Synoptic Studies of the Sun as a Key to Understanding Stellar Astrospheres
Valentin Martinez Pillet, Frank Hill, Heidi Hammel +11
Ground-based solar observations provide key contextual data (i.e., the 'big picture') to produce a complete description of the only astrosphere we can study in situ: our Sun's heli…
First detection of sign-reversed linear polarization from the forbidden [O I] 630.03 nm line
A. G. de Wijn, H. Socas-Navarro, N. Vitas
We report on the detection of linear polarization of the forbidden [O i] 630.03 nm spectral line. The observations were carried out in the broader context of the determination of t…
On the Instrument Profile of Slit Spectrographs
R. Casini, A. G. de Wijn
We derive an analytic expression for the instrument profile of a slit spectrograph, also known as the line spread function. While this problem is not new, our treatment relies on t…
Probable identification of the on-disk counterpart of spicules in Hinode Ca II H observations
A. G. de Wijn
I present a study of high-resolution time series of Ca II H images and Fe I 630.15 nm spectra taken with the Solar Optical Telescope on the Hinode spacecraft. There is excellent co…
Design of a Full-Stokes Polarimeter for VLT/X-shooter
Frans Snik, Gerard van Harten, Ramon Navarro +3
X-shooter is one of the most popular instruments at the VLT, offering instantaneous spectroscopy from 300 to 2500 nm. We present the design of a single polarimetric unit at the pol…
Stray light and polarimetry considerations for the COSMO K-Coronagraph
Alfred G. de Wijn, Joan T. Burkepile, Steven Tomczyk +3
The COSMO K-Coronagraph is scheduled to replace the aging Mk4 K-Coronameter at the Mauna Loa Solar Observatory of the National Center for Atmospheric Research in 2013. We present b…
Preliminary design of the Visible Spectro-Polarimeter for the Advanced Technology Solar Telescope
Alfred G. de Wijn, Roberto Casini, Peter G. Nelson +1
The Visible Spectro-Polarimeter (ViSP) is one of the first light instruments for the Advanced Technology Solar Telescope (ATST). It is an echelle spectrograph designed to measure t…
The chromosphere and prominence magnetometer
Alfred G. de Wijn, Christian Bethge, Steven Tomczyk +1
The Chromosphere and Prominence Magnetometer (ChroMag) is conceived with the goal of quantifying the intertwined dynamics and magnetism of the solar chromosphere and in prominences…
Analysis of Seeing-Induced Polarization Cross-Talk and Modulation Scheme Performance
Roberto Casini, Alfred G. de Wijn, Philip G. Judge
We analyze the generation of polarization cross-talk in Stokes polarimeters by atmospheric seeing, and its effects on the noise statistics of spectropolarimetric measurements for b…
Quiet-Sun imaging asymmetries in NaI D1 compared with other strong Fraunhofer lines
R. J. Rutten, J. Leenaarts, L. H. M. Rouppe van der Voort +3
Imaging spectroscopy of the solar atmosphere using the NaI D1 line yields marked asymmetry between the blue and red line wings: sampling a quiet-Sun area in the blue wing displays…
Wavelength-Diverse Polarization Modulators for Stokes Polarimetry
Steven Tomczyk, Roberto Casini, Alfred G. de Wijn +1
Information about the three-dimensional structure of solar magnetic fields is encoded in the polarized spectra of solar radiation by a host of physical processes. To extract this i…
Observations of solar scattering polarization at high spatial resolution
F. Snik, A. G. de Wijn, K. Ichimoto +3
The weak, turbulent magnetic fields that supposedly permeate most of the solar photosphere are difficult to observe, because the Zeeman effect is virtually blind to them. The Hanle…
Fabry-Perot versus slit spectropolarimetry of pores and active network. Analysis of IBIS and Hinode data
P. G. Judge, A. Tritschler, H. Uitenbroek +3
We discuss spectropolarimetric measurements of photospheric (Fe I 630.25 nm) and chromospheric (Ca II 854.21 nm) spectral lines. Our long-term goal is to diagnose properties of the…
On the propagation of p-modes into the solar chromosphere
A. G. de Wijn, S. W. McIntosh, B. De Pontieu
We employ tomographic observations of a small region of plage to study the propagation of waves from the solar photosphere to the chromosphere using a Fourier phase-difference anal…
Statistics of convective collapse events in the photosphere and chromosphere observed with the Hinode SOT
C. E. Fischer, A. G. de Wijn, R. Centeno +2
Aims. Convective collapse, a theoretically predicted process that intensifies existing weak magnetic fields in the solar atmosphere, was first directly observed in a single event b…
Direct Imaging of Fine Structure in the Chromosphere of a Sunspot Umbra
H. Socas-Navarro, S. W. McIntosh, R. Centeno +2
High-resolution imaging observations from the Hinode spacecraft in the CaII H line are employed to study the dynamics of the chromosphere above a sunspot. We find that umbral flash…