A5079401768- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Neutrino Physics Research
- Radio Astronomy Observations and Technology
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- CCD and CMOS Imaging Sensors
- Stellar, planetary, and galactic studies
- Dark Matter and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Adaptive optics and wavefront sensing
- Planetary Science and Exploration
- Pulsars and Gravitational Waves Research
- Cryospheric studies and observations
- Ionosphere and magnetosphere dynamics
- Noncommutative and Quantum Gravity Theories
- Low-power high-performance VLSI design
- Astronomical Observations and Instrumentation
- Particle physics theoretical and experimental studies
- Astrophysical Phenomena and Observations
- Earthquake Detection and Analysis
- Radiation Detection and Scintillator Technologies
- Advanced Optical Sensing Technologies
- Soil Moisture and Remote Sensing
- Radio Wave Propagation Studies
Ewha Womans University
2010-2024
National Taiwan University
2014-2023
Cheongju University
2023
Uppsala University
2022
University of California, Irvine
2007-2021
Taiwan Space Agency
2021
Chiba University
2006-2020
Chung-Ang University
2015
Korea Advanced Institute of Science and Technology
2012
University of California, Berkeley
2006-2012
Ultrahigh energy neutrinos are interesting messenger particles since, if detected, they can transmit exclusive information about ultrahigh processes in the Universe. These particles, with energies above ${10}^{16}\text{ }\text{ }\mathrm{eV}$, interact very rarely. Therefore, detectors that instrument several gigatons of matter needed to discover them. The ARA detector is currently being constructed at South Pole. It designed use Askaryan effect, emission radio waves from neutrino-induced...
The Payload for Ultrahigh Energy Observations (PUEO) long-duration balloon experiment is designed to have world-leading sensitivity ultrahigh-energy neutrinos at energies above 1 EeV. Probing this energy region essential understanding the extreme-energy universe all distance scales. PUEO leverages experience from and supersedes successful Antarctic Impulsive Transient Antenna (ANITA) program, with an improved design that drastically improves by more than order of magnitude below 30 will...
The Askaryan Radio Array (ARA) is an ultra-high energy (UHE, $>10^{17}$ eV) neutrino detector designed to observe neutrinos by searching for the radio waves emitted relativistic products of neutrino-nucleon interactions in Antarctic ice. In this paper, we present constraints on diffuse flux between $10^{16}-10^{21}$ eV resulting from a search two complementary analyses, both analyzing four years data (2013-2016) deep stations (A2, A3) operating at that time. We place 90 % CL upper limit all...
The primary mission of the ARIANNA ultra-high energy neutrino telescope is to uncover astrophysical sources neutrinos with energies greater than $10^{16}\mathrm{eV}$. A pilot array, consisting seven stations located on surface Ross Ice Shelf in Antarctica, was commissioned November 2014. We report search for using data collected between 2014 and February 2019. straight-forward template matching analysis yielded no candidates, a signal efficiency 79%. find 90% confidence upper limit diffuse...
Abstract Fast Radio Bursts (FRBs) are bright millisecond-duration radio transients that appear about 1000 times per day, all-sky, for a fluence threshold 5 Jy ms at 600 MHz. The FRB radio-emission physics and the compact objects involved in these events subjects of intense active debate. To better constrain source models, Bustling Universe Survey Telescope Taiwan (BURSTT) is optimized to discover localize large sample rare, high-fluence, nearby FRBs. This population most amenable...
For fifty years, cosmic-ray air showers have been detected by their radio emission. We present the first laboratory measurements that validate electrodynamics simulations used in shower modeling. An experiment at SLAC provides a beam test of radio-frequency (RF) radiation from charged particle cascades presence magnetic field, model system shower. This suite controlled to compare particle-level RF emission, which are relied upon ultra-high-energy detection. data for intensity, linearity with...
We report the observation of radar echoes from ionization trails high-energy particle cascades. Data were taken at SLAC National Accelerator Laboratory, where full electron beam (∼10^{9} e^{-} ∼10 GeV/e^{-}) was directed into a plastic target to simulate an ultrahigh-energy neutrino interaction. The interrogated with radio waves, and coherent reflections cascades detected properties consistent theoretical expectations. This is first definitive cascades, which may lead viable detection...
The sources of ultra-high energy (UHE) cosmic rays, which can have energies up to 1020 eV, remain a mystery. UHE neutrinos may provide important clues understanding the nature cosmic-ray sources. ARIANNA aims detect via radio (Askaryan) emission from particle showers when neutrino interacts with ice, is an efficient method for between 1016 eV and eV. detectors are located in Antarctic ice just beneath surface. Neutrino observation requires that pulses propagate antennas at surface minimum...
We report on design, manufacture, and testing of a Slewing Mirror Telescope (SMT), the first its kind part Ultra-Fast Flash Observatory-pathfinder (UFFO-p) for space-based prompt measurement early UV/optical light curves from Gamma-Ray Bursts (GRBs).Using fast slewing mirror 150 mm diameter mounted 2 axis gimbal stage, SMT can deliver images GRB optical counterparts to intensified CCD detector within 1.5~1.8s over ± 35 degrees in field view.Its Ritchey-Chrétien telescope 100 provides 17 ×...
Accelerating relativistic mirrors have long been recognized as viable settings where the physics mimic those of black hole Hawking radiation. In 2017, Chen and Mourou proposed a novel method to realize such system by traversing an ultra-intense laser through plasma target with decreasing density. An international AnaBHEL (Analog Black Hole Evaporation via Lasers) collaboration was formed objectives observing analog radiation, shedding light on information loss paradox. To reach these goals,...
One of the least documented and understood aspects gamma-ray bursts (GRBs) is rise phase optical light curve. The Ultra-Fast Flash Observatory (UFFO) an effort to address this question through extraordinary opportunities presented by a series space missions including small spacecraft observatory. UFFO equipped with fast-response Slewing Mirror Telescope (SMT) that uses rapidly moving mirror or array redirect beam rather than slewing entire aim instrument at GRB position. will probe early...
We investigate the use of parabolic equation (PE) methods for solving radio-wave propagation in polar ice. PE provide an approximate solution to Maxwell's equations, contrast full-field solutions such as finite-difference-time-domain (FDTD) methods, yet a more complete model than simple geometric ray-tracing (RT) that are current state art simulating in-ice radio detection neutrino-induced cascades. computationally efficient FDTD and flexible RT allowing inclusion diffractive effects,...
We consider the implications of Lorentz-invariance violation (LIV) on cosmogenic neutrino observations, with particular focus constraints imposed several well-developed models for ultra-high energy production by recent results from Antarctic Impulsive Transient Antenna (ANITA) long-duration balloon payload, and Radio Ice Cherenkov Experiment (RICE) at South Pole. Under a scenario proposed originally Coleman Glashow, each lepton family may attain maximum velocities that can exceed speed...
Ongoing experimental efforts in Antarctica seek to detect ultra-high energy neutrinos by measurement of radio-frequency (RF) Askaryan radiation generated the collision a neutrino with an ice molecule. An array RF antennas, deployed either in-ice or in-air, is used infer properties neutrino. To evaluate their sensitivity, such experiments require refractive index model for ray tracing radio-wave trajectories from putative interaction point receiving antennas; this gives degree signal...
Abstract The TAROGE-M radio observatory is a self-triggered antenna array on top of the ∼2700 m high Mt. Melbourne in Antarctica, designed to detect impulsive geomagnetic emission from extensive air showers induced by ultra-high energy (UHE) particles beyond 10 17 eV, including cosmic rays, Earth-skimming tau neutrinos, and particularly, “ANITA anomalous events” (AAE) near below horizon. six AAE discovered ANITA experiment have signal features similar neutrinos but that hypothesis tension...
Abstract We describe herein a measurement of the Antarctic surface “roughness” performed by balloon‐borne ANITA (Antarctic Impulsive Transient Antenna) experiment. Originally purposed for cosmic ray astrophysics, radio frequency (RF) receiver gondola, from its 38 km altitude vantage point, can scan disk snow 600 in radius. The primary purpose is to detect RF emissions rays incident on Antarctica, such as neutrinos which penetrate through atmosphere and interact within ice, resulting signal...
Abstract The ARIANNA experiment is an Askaryan detector designed to record radio signals induced by neutrino interactions in the Antarctic ice. Because of low flux at high energies (E_ν> 10^16 eV), physics output limited statistics. Hence, increase sensitivity significantly improves interpretation data and offers ability probe new parameter spaces. amplitudes trigger threshold are rate triggering on unavoidable thermal noise fluctuations. We present a real-time rejection algorithm that...
We set the first limits on ultra-high energy (UHE) neutrino fluence at energies greater than 109 GeV from gamma-ray bursts (GRBs) based data second flight of Antarctic Impulsive Transient Antenna (ANITA). During 31 day ANITA-II, 26 GRBs were recorded by Swift or Fermi. Of these, we analyzed 12 which occurred during quiet periods when payload was away anthropogenic activity. In a blind analysis, observe 0 events total background 0.0044 in combined prompt window for all low-background bursts....
The ARIANNA detector is designed to detect neutrinos with energies above $10^{17}$eV. Due the similarities in generated radio signals, cosmic rays are often used as test beams for neutrino detectors. Some stations equipped antennas capable of detecting air showers. Since emission properties showers well understood, and polarization signal can be predicted from arrival direction, a proxy assess reconstruction capabilities detector. We report on dedicated efforts reconstructing cosmic-ray...
In a new Tatiana‐2 mission the measurement of transient luminous events (TLE) in Earth atmosphere nadir direction are planned. Near UV temporal images TLE millisecond scale will be measured together with profiles 8 channels wide spectrum emission. Simultaneously variation electron flux at satellite orbit measured. Aims these measurements to continue research bright flashes, started Tatiana‐1 (Universitetsky–Tatiana satellite), their global distribution, rate over oceans and continents,...
The primary science goal of the NASA-sponsored ANITA project is measurement ultra-high energy neutrinos and cosmic rays, observed via radio-frequency signals resulting from a neutrino or ray interaction with terrestrial matter (e.g. atmospheric ice molecules). Accurate inference energies these rays requires understanding transmission/reflection radio wave across ice–air boundary. Satellite-based measurements Antarctic surface reflectivity, using co-located transmitter receiver, have been...
The Ultra-Fast Flash Observatory (UFFO) Burst Alert and Trigger Telescope (UBAT) has been designed built for the localization of transient X-ray sources such as Gamma Ray Bursts (GRBs). As one main instruments in UFFO payload onboard Lomonosov satellite (hereafter UFFO/Lomonosov), UBAT's roles are to monitor sky, rapidly locate track sources, trigger slewing a UV/optical telescope, namely Slewing Mirror (SMT). SMT, pioneering application rapid mirror technology line sight parallel UBAT,...