A5001076932- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Adaptive optics and wavefront sensing
- Solar Radiation and Photovoltaics
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- solar cell performance optimization
- Infrared Target Detection Methodologies
- Optical Systems and Laser Technology
- CCD and CMOS Imaging Sensors
- Calibration and Measurement Techniques
- Optical Polarization and Ellipsometry
- Geophysics and Gravity Measurements
- History and Developments in Astronomy
- Atmospheric Ozone and Climate
- Remote Sensing and Land Use
- Impact of Light on Environment and Health
- Superconducting and THz Device Technology
- Gamma-ray bursts and supernovae
- Advanced Image Fusion Techniques
- Oil, Gas, and Environmental Issues
- Advanced Semiconductor Detectors and Materials
New Jersey Institute of Technology
2015-2024
Bear Valley
2013-2023
National Solar Observatory
2005-2022
Dalian University of Technology
2018
Purple Mountain Observatory
2017
Korea Astronomy and Space Science Institute
2011
Seoul National University
2011
Yunnan Observatories
1993-2004
National Astronomical Observatories
2000-2003
Chinese Academy of Sciences
2000-2002
Abstract The NST (New Solar Telescope), a 1.6 m clear aperture, off‐axis telescope, is in its commissioning phase at Big Bear Observatory (BBSO). It will be the most capable, largest aperture solar telescope US until 4 ATST (Advanced Technology Telescope) comes on‐line late next decade. outfitted with state‐of‐the‐art scientific instruments Nasmyth focus on floor and Coudé Lab beneath telescope. At focus, several filtergraphs already routine operation have offered high spatial resolution...
Spicules are rapidly evolving fine-scale jets of magnetized plasma in the solar chromosphere. It remains unclear how these prevalent originate from surface and what role they play heating atmosphere. Using Goode Solar Telescope at Big Bear Observatory, we observed spicules emerging within minutes appearance opposite-polarity magnetic flux around dominant-polarity field concentrations. Data Dynamics Observatory showed subsequent adjacent corona. The dynamic interaction fields (likely due to...
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...
Solid evidence of magnetic reconnection is rarely reported within sunspots, the darkest regions with strongest fields and lowest temperatures in solar atmosphere. Using world's largest telescope, 1.6-meter Goode Solar Telescope, we detect prevalent through frequently occurring fine-scale jets H${\alpha}$ line wings at light bridges, bright lanes that may divide dark sunspot core into multiple parts. Many have an inverted Y-shape, shown by models to be typical a unipolar field environment....
Abstract We analyze high-resolution observations of an X-1.0 white-light flare, triggered by a filament eruption, on 2022 October 2. The full process formation and subsequent eruption was captured in the H α passband Visible Imaging Spectrograph (VIS) board Goode Solar Telescope (GST) within its center field view. White-light emissions appear flare ribbons following ribbon brightening. GST Broadband Filter Imager data show that continuum intensity, as compared to nearby quiet-Sun area, has...
Abstract In January 2009, first light observations with the NST (New Solar Telescope) in Big Bear Observatory (BBSO) were made. has a 1.7 m primary 1.6 clear aperture. First observational results TiO and H α are shown discussed. The mirror is most aspheric telescope deployed to date. early its commissioning, plans for this phase will be sketched. Lessons learned building implementing germane ATST EST telescopes an off‐axis Gregorian configuration consisting of parabolic primary, heat‐stop,...
We report the first direct observations of dynamical events originating in Sun's photosphere and subsequently lighting up corona. Continuous small-scale, impulsive have been tracked from their origin on through to brightening local achieve this by combining high-resolution ground-based data 1.6 m aperture New Solar Telescope (NST) at Big Bear Observatory (BBSO), satellite Atmospheric Imaging Assembly (AIA) board Dynamics (SDO). The NST imaging helium I 10830 Å reveal unexpected complexes...
Abstract Magnetic flux ropes are highly twisted, current-carrying magnetic fields. They crucial for the instability of plasma involved in solar eruptions, which may lead to adverse space weather effects. Here we present observations a flaring using highest resolution chromospheric images from 1.6-m New Solar Telescope at Big Bear Observatory, supplemented by field extrapolation model. A set loops initially appear peel off an overall inverse S-shaped bundle, and then develop into...
Abstract The solar corona is two to three orders of magnitude hotter than the underlying photosphere, and energy loss coronal plasma extremely strong, requiring a heating flux over 1,000 W m − 2 maintain its high temperature. Using 1.6 Goode Solar Telescope, we report detection ubiquitous persistent transverse waves in umbral fibrils chromosphere strongly magnetized sunspot. carried by these was estimated be 7.52 × 10 6 −2 , four stronger rate active regions. Two-fluid magnetohydrodynamic...
<i>Context. <i/>Investigations of the behavior small-scale threads can provide an alternative approach to studying prominence dynamics and understanding its origin nature.<i>Aims. <i/>The are analyzed in a quiescent prominence, including drifting both horizontally vertically oscillating motions. These indicate waves solar prominence.<i>Methods. <i/>We used H<i>α<i/> images at setting wavelength +0.076 Å. A was observed by HINODE/SOT on 2008 January 15 for about 3 h total.<i>Results....
Here we analyze solar activity by focusing on time variations of the number sunspot groups (SGs) as a function their modified Zurich class. We analyzed data for cycles 20–23 using Rome (cycles 20 and 21) Learmonth Solar Observatory 22 23) SG numbers. All SGs recorded during these intervals were separated into two groups. The first group includes small (A, B, C, H, J classes classification), second consists large (D, E, F, G classes). then calculated numbers from daily mean observed disk...
Highest resolution observations made with the new 1.6 m aperture solar telescope in Big Bear Solar Observatory during this time of historic inactivity on Sun reveal insights into small-scale dynamics Sun's photosphere. The telescope's unprecedented enabled us to observe that smallest scale photospheric magnetic field seems come isolated points dark intergranular lanes, rather than predicted continuous sheets confined and unexpected longevity bright implies a deeper anchoring predicted....
Solar Active Region (AR) 12673 is the most flare productive AR in solar cycle 24. It produced four X-class flares including X9.3 on 06 September 2017 and X8.2 limb event 10 September. Sun Norton (2017) reported that this region had an unusual high rate of flux emergence, while Huang et al. (2018) extremely strong white-light emissions. Yang at described detailed morphological evolution AR. In report, we focus usual behaviors light bridge (LB) dividing delta configuration AR, namely magnetic...
Solar flares signify the sudden release of magnetic energy and are sources so called space weather. The fine structures (below 500 km) rarely observed accessible to only a few instruments world-wide. Here we present observation solar flare using exceptionally high resolution images from 1.6~m New Telescope (NST) equipped with order adaptive optics at Big Bear Observatory (BBSO). reveals process in unprecedented detail, including ribbon propagating across sunspots, coronal rain (made...
We observed two X-class white-light flares (WLFs) on 2003 October 29 (~20:40 UT) and November 2 (~17:16 using the Dunn Solar Telescope (DST) its High-Order Adaptive Optics (HOAO) system in several wavelengths. The spatial resolution was close to diffraction limit of DST's 76 cm aperture, cadence as high s. This is first time that WLFs have been near-infrared (NIR) wavelength region. present a detailed study this paper comparing photospheric continuum observations during events with...
The 1.6-m New Solar Telescope (NST) has been used to observe the Sun for more than three years with ever increasing capabilities as its commissioning phase winds down. NST is first facility-class solar telescope built in U.S. a generation, and it an off-axis design planned 4 m Advanced Technology Solar Telescope. Lessons learned will be discussed. Current post-focus instrumentation includes adaptive optics (AO) feeding photometric near-IR polarimetric sytems, well imaging spectrograph....
This Letter reports two rarely observed three-ribbon flares (M1.9 and C9.2) on 2012 July 6 in NOAA AR 11515, which we found with Halpha observations of 0.1" resolution from the New Solar Telescope CaII H images Hinode. The flaring site is characterized an intriguing "fish-bone-like" morphology evidenced by both a nonlinear force-free field (NLFFF) extrapolation, where semi-parallel rows low-lying, sheared loops connect elongated, parasitic negative sandwiching positive fields. NLFFF model...
Sunspots are concentrations of magnetic field visible on the solar surface (photosphere). It was considered implausible that flares, as resulted from reconnection in tenuous corona, would cause a direct perturbation dense photosphere involving bulk motion. Here we report sudden flare-induced rotation sunspot using unprecedented spatiotemporal resolution 1.6 m New Solar Telescope, supplemented by data Dynamics Observatory. is clearly observed non-uniform over sunspot: flare ribbon sweeps...
We improve our filament automated detection method which was proposed in previous works. It is then applied to process the full disk Hα data mainly obtained by Big Bear Solar Observatory from 1988 2013, spanning nearly three solar cycles. The butterfly diagrams of filaments, showing information area, spine length, tilt angle, and barb number, are obtained. variations these features with calendar year latitude band analyzed. drift velocities filaments different bands calculated studied. also...
Solar flares and coronal mass ejections (CMEs) are the most powerful explosions in Sun. They major sources of potentially destructive space weather conditions. However, possible causes their initiation remain controversial. By using high resolution data observed by NST BBSO, supplemented Dynamics Observatory (SDO) observations, we present unusual observations a small-scale emerging flux rope near large sunspot, whose eruption produced an M-class flare ejection. The presence was indicated...
Ellerman bombs (EBs) are small-scale intense brightenings in H$α$ wing images, which generally believed to be signatures of magnetic reconnection events around the temperature minimum region solar atmosphere. They have a flame-like morphology when observed near limb. Recent observations from Interface Region Imaging Spectrograph (IRIS) reveal another type events, termed UV bursts, lower Though previous shown clear coincidence some bursts and EBs, exact relationship between these two...
Detection range is an important factor affecting the transmission characteristics of polarized light through fog. We first selected certain spectral bands from visible to IR wavelengths that exhibit lower path loss. For both radiation fog and advection fog, these optimized wavelength ranges include 0.4-1.1 μm, 1.48-1.56 1.63-1.86 2.03-2.18 2.39-2.45 in particular contains 3.5-4.3 μm. The long-wave were excluded due higher absorption losses. further investigated performance circular linear...
ABSTRACT Solar flares are sudden flashes of brightness on the Sun and often associated with coronal mass ejections solar energetic particles that have adverse effects near-Earth environment. By definition, usually referred to as bright features resulting from excess emission. Using newly commissioned 1.6 m New Telescope at Big Bear Observatory, we show a striking “negative” flare narrow but unambiguous “dark” moving front observed in He i 10830 Å, which is 340 km distinct spectral...