A5005340549- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Stellar, planetary, and galactic studies
- Adaptive optics and wavefront sensing
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Solar Radiation and Photovoltaics
- Geophysics and Gravity Measurements
- Astronomy and Astrophysical Research
- solar cell performance optimization
- Gamma-ray bursts and supernovae
- History and Developments in Astronomy
- Geological and Geophysical Studies
- Optical Polarization and Ellipsometry
- Atomic and Subatomic Physics Research
- Astronomical Observations and Instrumentation
- Calibration and Measurement Techniques
- Astrophysical Phenomena and Observations
- Optical Coatings and Gratings
- Astrophysics and Cosmic Phenomena
- Atmospheric Ozone and Climate
- Earthquake Detection and Analysis
- Impact of Light on Environment and Health
- Advanced Thermodynamics and Statistical Mechanics
- Advanced optical system design
Experimental Center of Forestry in North China
2025
University of Hawaii System
2008-2024
University of Electronic Science and Technology of China
2024
National Solar Observatory
1996-2023
Monterey Institute for Research in Astronomy
2018-2023
University of Hawaiʻi at Mānoa
2000-2023
Center for Astrophysics Harvard & Smithsonian
2023
National Astronomical Observatory of Japan
2023
Ball (France)
2023
University of Oslo
2023
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...
A long-standing solar problem has been to measure the coronal magnetic field. We believe it determines structure and dynamics from upper chromosphere out into heliospheric environment. It is only recently that Zeeman splitting observations of infrared emission lines have successfully used deduce flux density. Here we extend this technique report first results a novel magnetometer uses an off-axis reflecting coronagraph optical fiber-bundle imaging spectropolarimeter. determine line-of-sight...
Magnetism dominates the structure and dynamics of solar corona. Current theories suggest that it may also be responsible for coronal heating. Despite importance magnetic field in physics corona despite tremendous progress made recently remote sensing fields, reliable measurements strength orientation do not exist. This is largely due to weakness previously estimated on order 10 G, difficulty associated with observing extremely faint emission. Using a very sensitive infrared...
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...
We report new observations that combine high-precision infrared polarimetry and high-resolution imagery in the visible to demonstrate most of quiet solar surface contains a measurable magnetic field. found when observed at 1 arcsec2 resolution, 68% area flux higher than 5×1015 Mx (corresponding an apparent average field G). The majority these features have below 5×1016 Mx. Their strengths range from 200 1000 G, which means their filling factors are on order 1%. spatial distribution time...
view Abstract Citations (181) References (28) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS On the Distribution of Solar Magnetic Fields Lin, Haosheng This paper reports a study distribution solar magnetic field using two magnetically sensitive infrared Fe I lines at 15648 Å and 15652 Å. We scanned spectrograph slit across surface (both active quiet regions) to obtain three-dimensional data cubes (two spatial dimensions one spectral dimension). Using full...
Abstract Supernova (SN) 2018oh (ASASSN-18bt) is the first spectroscopically confirmed Type Ia supernova (SN Ia) observed in Kepler field. The data revealed an excess emission its early light curve, allowing us to place interesting constraints on progenitor system. Here we present extensive optical, ultraviolet, and near-infrared photometry, as well dense sampling of optical spectra, for this object. SN relatively normal photometric evolution, with a rise time 18.3 ± 0.3 days Δ m 15 ( B ) =...
An algorithm is developed for calibrating the spatial nonuniformity of image-array (CCD-type) detectors. Like other techniques this approach uses multiple, spatially displaced images. In circumstances where high-precision flat fields are not available by means (i.e., sky flats) technique advantageous as it data frames gain calibration even when array images extended, nonuniform, sources. Numerical experiments and direct observations with intrinsically uniform quite nonuniform detectors show...
Atomic-level polarization and Zeeman effect diagnostics in the neutral helium triplet at 10830 angstroms principle allow full vector magnetometry of fine-scaled chromospheric fibrils. We present high-resolution spectropolarimetric observations superpenumbral fibrils He I with sufficient polarimetric sensitivity to infer their magnetic field geometry. from Facility Infrared Spectropolarimeter (FIRS) are paired Halpha 6563 Ca II 8542 spectral lines Interferometric Bidimensional Spectrometer...
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 Magnetic influences increase in importance the solar atmosphere from photosphere out into corona, yet our ability to routinely measure magnetic fields outer is lacking. We describe scientific objectives and capabilities of COronal Solar Magnetism Observatory (COSMO), a proposed synoptic facility designed plasma properties large‐scale atmosphere. COSMO comprises suite three instruments chosen enable study as coupled system: (1) coronagraph with 1.5 m aperture field, temperature,...
Nocturnal water consumption (NWC), known as including stem refilling (SR) and nocturnal transpiration (NT), has been documented in many plant species, but we do not yet have a clear understanding of species differences the biotic abiotic regulation this phenomenon, especially for subtropical tropical plantations. In study, examine magnitude, seasonality, NWC, SR, NT three widely planted Eucalyptus spp., Hevea brasiliensis, Castanopsis hystrix, through measured sap meteorological variables....
Failed filament eruptions not associated with a coronal mass ejection (CME) have been observed and reported as evidence for solar field confinement on erupting flux ropes. In those events, each eventually returns to its origin the surface. this Letter, new observation of two failed is which indicates that confined can be ejected places far from original channel. The jetlike motions in are thought due asymmetry background magnetic fields respect locations channels. confirmed by an...
In this paper, we present a new Stokes polarization observation of solar filament using the neutral helium line at 10830 Å. Similar to prominence Hanle effect, is due resonant scattering and magnetic depolarization photospheric radiation; it differs only in geometry. Since represents one first observations, also classical derivation set diagnostic formulae that relate signals vector field.
Recent advances have made it possible to obtain two-dimensional line-of-sight magnetic field maps of the solar corona from spectropolarimetric observations Fe XIII 1075 nm forbidden coronal emission line. Together with linear polarization measurements that map azimuthal direction field, these vector magnetograms now allow for direct observational testing theoretical models. This paper presents a study validity potential-field We constructed model active region AR 10582 observed by SOLARC...
In this paper, we investigate the feasibility of saturated coronal Hanle effect vector tomography or application tomographic inversion techniques to reconstruct three-dimensional magnetic field configuration solar corona using linear polarization measurements emission lines. We applied artificial data produced from analytical models with equatorial and meridional currents global constructed by extrapolation real photospheric measurements. tested only Stokes Q, U, electron density,...
We present an exquisite, 30-min cadence Kepler (K2) light curve of the Type Ia supernova (SN Ia) 2018oh (ASASSN-18bt), starting weeks before explosion, covering moment explosion and subsequent rise, continuing past peak brightness. These data are supplemented by multi-color Pan-STARRS1 CTIO 4-m DECam observations obtained within hours explosion. The K2 has unusual two-component shape, where flux rises with a steep linear gradient for first few days, followed quadratic rise as seen typical...
We present extensive ultraviolet (UV) and optical photometry, as well dense spectroscopy, for type II Plateau (IIP) supernova SN 2016X that exploded in the nearby (∼15 Mpc) spiral galaxy UGC 08041. The observations span period from 2 to 180 d after explosion; particular, Swift UV data probably captured signature of shock breakout associated with explosion 2016X. It shows very strong emission during first week explosion, a contribution ∼20–30 per cent bolometric luminosity (versus ≲15 normal...
Abstract The Diffraction-Limited Near-Infrared Spectropolarimeter (DL-NIRSP) is one of the first-light instruments for National Science Foundation’s Daniel K. Inouye Solar Telescope (DKIST). DL-NIRSP an integral-field, dual-beam spectropolarimeter intended studying magnetically sensitive spectral lines in Sun’s photosphere, chromosphere, and corona with high resolution polarimetric accuracy. Two novel fiber-optic integral-field units (IFUs), paired selectable feed optics a field-scanning...
Earth-based observations of Jupiter indicate that the Galileo probe probably entered Jupiter's atmosphere just inside a region has less cloud cover and drier conditions than more 99 percent rest planet. The visual appearance clouds at site was generally dark longer wavelengths. tropospheric stratospheric temperature fields have strong longitudinal wave structure is expected to manifest itself in vertical profile.
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...
ABSTRACT We present the first direct “observation” of global-scale, 3D coronal magnetic fields Carrington Rotation (CR) Cycle 2112 using vector tomographic inversion techniques. The uses measurements Fe xiii 10747 Å Hanle effect polarization signals by Coronal Multichannel Polarimeter ( CoMP ) and density temperature derived from scalar Solar Terrestrial Relations Observatory STEREO )/ Extreme Ultraviolet Imager EUVI emission lines (CELs) intensity images as inputs to derive a field model...
ABSTRACT The variation of the vector magnetic field along structures in solar corona remains unmeasured. Using a unique combination spectropolarimetry and stereoscopy, we infer compare structure three-dimensional morphology an individuated coronal loop undergoing thermal instability. We analyze spectropolarimetric data He i λ 10830 triplet ( <?CDATA $1s2s{}^{3}{S}_{1}-1s2p{}^{3}{P}_{\mathrm{2,1,0}}$?> ) obtained at Dunn Solar Telescope with Facility Infrared Spectropolarimeter on 2011...
We present an observational study of the luminous red nova (LRN) AT\,2021biy in nearby galaxy NGC\,4631. The field object was routinely imaged during pre-eruptive stage by synoptic surveys, but transient detected only at a few epochs from $\sim 231$\,days before maximum brightness. LRN outburst monitored with unprecedented cadence both photometrically and spectroscopically. shows short-duration blue peak, bolometric luminosity 1.6 \times 10^{41}$\,erg\,s$^{-1}$, followed longest plateau...