A5003606581- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Adaptive optics and wavefront sensing
- Solar Radiation and Photovoltaics
- Geomagnetism and Paleomagnetism Studies
- History and Developments in Astronomy
- Astronomy and Astrophysical Research
- Ionosphere and magnetosphere dynamics
- Astronomical Observations and Instrumentation
- Geophysics and Gravity Measurements
- solar cell performance optimization
- Calibration and Measurement Techniques
- Galaxies: Formation, Evolution, Phenomena
- Atmospheric Ozone and Climate
- Spacecraft Design and Technology
- Spectroscopy Techniques in Biomedical and Chemical Research
- Optical Polarization and Ellipsometry
- Infrared Target Detection Methodologies
- Astrophysics and Star Formation Studies
- Impact of Light on Environment and Health
- Photovoltaic System Optimization Techniques
- Optical Wireless Communication Technologies
- CCD and CMOS Imaging Sensors
- Space exploration and regulation
National Solar Observatory
2014-2024
Association of Universities For Research In Astronomy
2006-2010
U.S. National Science Foundation
2006-2008
Institut für Sonnenphysik
2002-2006
New Jersey Institute of Technology
2004-2006
Bear Valley
2005
Abstract We present an overview of the National Science Foundation’s Daniel K. Inouye Solar Telescope (DKIST), its instruments, and support facilities. The 4 m aperture DKIST provides highest-resolution observations Sun ever achieved. large combined with state-of-the-art instrumentation provide sensitivity to measure vector magnetic field in chromosphere faint corona, i.e. for first time we will be able study most important free-energy source outer solar atmosphere – coronal field. Over...
Abstract The 4‐m aperture Daniel K. Inouye Solar Telescope (DKIST) formerly known as the Advanced Technology (ATST) is currently under construction on Haleakalā (Maui, Hawai'i) projected to start operations in 2019. At time of completion, DKIST will be largest ground‐based solar telescope providing unprecedented resolution and photon collecting power. equipped with a set first‐light facility‐class instruments offering unique imaging, spectroscopic spectropolarimetric observing opportunities...
The Daniel K. Inouye Solar Telescope (DKIST) will revolutionize our ability to measure, understand and model the basic physical processes that control structure dynamics of Sun its atmosphere. first-light DKIST images, released publicly on 29 January 2020, only hint at extraordinary capabilities which accompany full commissioning five facility instruments. With this Critical Science Plan (CSP) we attempt anticipate some what those enable, providing a snapshot scientific pursuits hopes engage...
The structure and energy balance of the solar chromosphere remain poorly known. We have used imaging spectrometer IBIS at Dunn Solar Telescope to obtain fast-cadence, multi-wavelength profile sampling Halpha Ca II 854.2 nm over a sizable two-dimensional field view encompassing quiet-Sun network. provide first inventory how quiet appears in these two lines by comparing basic measurements form image displays, temporal-average time slices, pixel-by-pixel correlations. find that can be markedly...
The Daniel K. Inouye Solar Telescope is a 4-meter-class all-reflecting telescope under construction on Haleakalā mountain the island of Maui, Hawai'i. When fully operational in 2019 it will be world's largest solar with wavelength coverage 380 nm to 28 microns and advanced Adaptive Optics enabling highest spatial resolution measurements atmosphere yet achieved. We review first-generation DKIST instrument designs, select critical science program topics, operations data handling processing...
Abstract We use the first publicly available data from Daniel K. Inouye Solar Telescope to track magnetic connections solar photosphere into corona. scrutinize relationships between chromospheric magnetism and bright chromospheric, transition region, coronal plasmas. In 2022 June, Visible Spectro-Polarimeter (ViSP) instrument targeted unipolar network within a decaying active region. ViSP acquired rastered scans with longitudinal Zeeman sensitivities of 0.25 Mx cm −2 (Fe i, 630.2 nm) 0.5 (Ca...
The relationship between observed structures in the solar atmosphere and magnetic fields threading them is known only for photosphere, even then imprecisely. We suggest that some of fine structure more tenuous chromosphere corona- specifically populations spicules fibrils- correspond to warps 2D sheet-like structures, as an alternative conventional interpretations terms tube-like structures. sheets are perhaps related tangential discontinuities, which Parker has argued arise naturally...
Abstract The strongly coupled hydrodynamic, magnetic, and radiation properties of the plasma in solar chromosphere make it a region Sun's atmosphere that is poorly understood. We use data obtained with high-resolution Visible Broadband Imager (VBI) equipped an H β filter Spectro-Polarimeter (ViSP) on Daniel K. Inouye Solar Telescope to investigate fine-scale structure plage chromosphere. To aid interpretation VBI imaging data, we also analyze spectra from CHROMospheric Imaging Spectrometer...
Three uniquely powerful solar and heliospheric facilities are now operational at the same time. The US National Science Foundation's Daniel K Inouye Solar Telescope, NASA's Parker Probe, ESA's Orbiter each represent frontiers in space science, pursue richly tailored science missions. At intersection of these missions, though, lie unparalleled opportunities for multi-vantage point science. This symbiotic relationship is especially pronounced during PSP's perihelia remote windows. As most...
Solar Orbiter's coordinated observations with space-based and ground-based instruments are game changers in studying the connection between Sun heliosphere. Our aim is to present results challenges of obtained Orbiter other highlight advantages using various telescopes.We received two groups unique observations:1) We successfully observation campaigns Daniel K. Inouye Telescope (DKIST) October 2022 2023. These telescopes provide a stereoscopic view unprecedented high resolution. The...
We investigate the properties of fine structure a sunspot penumbra based on spectroscopic measurements with high spectral () and spatial (≈0.5 arcsec) resolution. The magnetically insensitive Fe I 557.6 nm line is used to probe penumbral atmosphere. data was taken at German Vacuum Tower Telescope 2D-spectrometer TESOS, taking advantage recently installed Kiepenheuer Adaptive Optics System (KAOS). field view covers located 23° off disk center its immediate surroundings. studied by means maps...
We investigate the thermal and kinematic configuration of a sunspot penumbra using very high spectral spatial resolution intensity profiles non-magnetic Fe I 557.6 nm line. The dataset was acquired with 2D solar spectrometer TESOS. are inverted one-component model atmosphere gradients physical quantities. From this inversion we obtain stratification depth temperature, line-of-sight velocity, microturbulence across penumbra. Our results suggest that mechanism(s) responsible for penumbral...
We study the evolution of flows and horizontal proper motions in around a decaying follower sunspot based on time sequences two-dimensional spectroscopic observations visible white-light imaging data obtained over 6 days from 2005 June 7 to 12. During this period decayed gradually pore. The were with Fabry-Pérot-based Visible-Light Imaging Magnetograph (VIM) conjunction high-order adaptive optics (AO) system operated at 65 cm vacuum reflector Big Bear Solar Observatory (BBSO). apply local...
We present an unprecedented high-resolution \ha\ imaging spectroscopic observation of a C4.1 flare taken with IBIS on 2011 October 22. The consists main circular ribbon that occurred in parasitic magnetic configuration and remote was observed by the IBIS. Such circular-ribbon brightening is predicted 3D fan-spine reconnection but so far has been rarely observed. During impulsive phase, we define "core" "halo" structures ribbon. Examining emission spectra averaged core halo areas, find only...
We present results from the analysis of high-resolution spectropolarimetric and spectroscopic observations solar photosphere chromosphere, obtained shortly before formation a penumbra in one leading polarity sunspots NOAA active region 11490. The were performed at Dunn Solar Telescope National Observatory on 2012 May 28, using Interferometric Bidimensional Spectrometer. data set is comprised 1 hr time sequence measurements Fe i 617.3 nm 630.25 lines (full Stokes polarimetry) Ca ii 854.2 line...
We provide an update on the construction status of Daniel K. Inouye Solar Telescope. This 4-m diameter facility is designed to enable detection and spatial/temporal resolution predicted, fundamental astrophysical processes driving solar magnetism at their intrinsic scales throughout atmosphere. These data will drive key research its influence winds, flares, coronal mass ejections irradiance variability. The developed support a broad wavelength range (0.35 28 microns) employ state-of-the-art...
Regular remote sensing of the magnetic field embedded within million-degree solar corona is severely lacking. This reality impedes fundamental investigations nature coronal heating, generation and stellar winds, impulsive release energy into system via flares other eruptive phenomena. Resulting from advancements in large aperture coronagraphy, we report unprecedented maps polarized spectra emitted at 1074 nm by Fe +12 atoms active corona. We detect clear signatures Zeeman effect that are...
The efficient release of magnetic energy in astrophysical plasmas, such as during solar flares, can principle be achieved through diffusion, at a rate determined by the associated electric field. However, attempts measuring fields atmosphere are scarce, and none exist for sites where is presumably released. Here, we present observations an energetic event using National Science Foundation's Daniel K. Inouye Solar Telescope, detect polarization signature with diffusion. We measure linear...
In this work we investigate the properties of penumbral transients observed in upper photospheric and chromospheric region above a sunspot penumbra using two-dimensional spectroscopic observations Ca ii 854.21 nm line with 5 s cadence. our 30 minutes observations, identify several penumbral-micro jets (PMJs) cotemporal from Dunn Solar Telescope/IBIS Hinode/SOT. We find that profiles these PMJ events show emission two wings (±0.05 nm), but little modification core. These are reminiscent...
Abstract Plage regions are patches of concentrated magnetic field in the Sun’s atmosphere where hot coronal loops rooted. While previous studies have shed light on properties plage fields photosphere, there still challenges measuring overlying chromospheric fields, which crucial to understanding overall heating and dynamics. Here, we utilize high-sensitivity, spectropolarimetric data obtained by 4 meter Daniel K. Inouye Solar Telescope investigate dynamic environment stratification an...
We report on high angular resolution, precision spectropolarimetric measurements of a decaying sunspot. The spot gradually lost its penumbra during the course three days. In late stages evolution where only remnant is naked umbra, we find small-scale inhomogeneities in magnetic canopy surrounding it. are observed as finger-like structures weak and nearly horizontal fields extending 1-2 arcsec from outer border umbra. These not associated with filamentary continuum intensity, nor conspicuous...