A5044081799- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Planetary Science and Exploration
- Geomagnetism and Paleomagnetism Studies
- Solar and Space Plasma Dynamics
- Magnetic confinement fusion research
- earthquake and tectonic studies
- Earthquake Detection and Analysis
- Green IT and Sustainability
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- High-pressure geophysics and materials
- High-Energy Particle Collisions Research
- Electrostatic Discharge in Electronics
- GNSS positioning and interference
- Recycling and Waste Management Techniques
- Tropical and Extratropical Cyclones Research
- Space Exploration and Technology
- Astrophysics and Cosmic Phenomena
National Cheng Kung University
2010-2023
Institute of Physics, Academia Sinica
2007-2010
The $\bar{\nu}_{e}-e^{-}$ elastic scattering cross-section was measured with a CsI(Tl) scintillating crystal array having total mass of 187kg. detector exposed to an average reactor $\bar{\nu}_{e}$ flux $\rm{6.4\times 10^{12} ~ cm^{-2}s^{-1}}$ at the Kuo-Sheng Nuclear Power Station. experimental design, conceptual merits, hardware, data analysis and background understanding experiment are presented. Using 29882/7369 kg-days Reactor ON/OFF data, Standard Model(SM) electroweak interaction...
A search of neutrino magnetic moments was carried out at the Kuo-Sheng nuclear power station a distance 28 m from 2.9 GW reactor core. With high purity germanium detector mass 1.06 kg surrounded by scintillating NaI(Tl) and CsI(Tl) crystals as anti-Compton detectors, detection threshold 5 keV background level $1\text{ }\text{ }{\mathrm{kg}}^{\ensuremath{-}1}\text{ }{\mathrm{keV}}^{\ensuremath{-}1}\text{ }{\mathrm{day}}^{\ensuremath{-}1}$ near were achieved. Details source, experimental...
Abstract The Tonga volcano eruption of 15 January 2022 unleashed a variety atmospheric perturbations, coinciding with the recovery‐phase geomagnetic storm. ensuing thermospheric variations created rare display extreme poleward‐expanding conjugate plasma bubbles seen in rate total electron content index over 100–150°E, reaching ∼40°N geographic latitude. This is associated fluctuations FORMOSAT‐7/COSMIC‐2 (F7/C2) ion‐density measurements and spread‐F ionograms. Preceding to this, an unusually...
A search of axions produced in nuclear transitions was performed at the Kuo-Sheng Nuclear Power Station with a high-purity germanium detector mass 1.06 kg distance 28 m from 2.9 GW reactor core. The expected experimental signatures were monoenergetic lines by their Primakoff or Compton conversions detector. Based on $459.0/96.3$ days ON/OFF data, no evidence axion emissions observed and constraints couplings ${g}_{a\ensuremath{\gamma}\ensuremath{\gamma}}$ ${g}_{aee}$ versus ${m}_{a}$ within...
Abstract A giant ionospheric hole was simultaneously detected in the situ measurements of FORMOSAT-7/COSMIC-2 (F7/C2), Ionospheric Connection Explorer (ICON), Swarm missions, and ground-based total electron content (TEC) by global navigation satellite system receivers, F7/C2 Global Ionosphere Specification (GIS) data near Tonga, following explosive volcano eruption on 15 January 2022. The TEC maps displayed huge depletions that developed Tonga after gradually evolved. ICON IVM, IVM Swarm-LP...
We model Saturn's magnetosphere during the Voyager 1 encounter on days 317 and 318 in 1980 2 237 238 1981, respectively. The rotating of Saturn is modeled by two‐dimensional axisymmetric equilibrium solutions Grad‐Shafranov type equation, which includes effects plasma pressure gradient force centrifugal due to toroidal rotation, prescribing radial profiles density temperature equatorial plane. By varying are obtained with reasonably good fit observed magnetic field data along orbits 1981....
The water-group ion cyclotron waves (ICWs) in Saturn's magnetosphere were studied using the magnetic field data provided by MAG magnetometer on board Cassini satellite. period from January 2005 to December 2009, when radial distance is smaller than 8 R S , was used. ICWs identified their left-hand circularly polarized perturbations and wave frequencies near gyrofrequencies. We obtained spatial distribution of ICW amplitude found that source region mostly located low-latitude region, equator...
The $\ge73m$ metastable states decay with a very characteristic signature which allow them to be tagged event-by-event. Studies were performed using data taken high-purity germanium detector in low-background laboratory near nuclear power reactor core where $\nuebar$-flux was $\rm{6.4 \times 10^{12} ~ cm^{-2} s^{-1}}$. measured average and equilibrium production rates of $\rm{(8.7 \pm 0.4)}$ $\rm{(6.7 0.3) kg^{-1} day^{-1}}$, respectively. channels studied identified. By studying the...
After publication of this work (Chou and Cheng 2017), an error was noticed. In the Acknowledgements section, wrong institution name given as 'the National Science Council Taiwan'. However, correct should be Ministry Technology
This article reports the first study of possible emissions axions from power reactors using Primakoff and Compton conversions as detection mechanisms. The expected experimental signatures are mono-energetic lines produced by their or at a high-purity germanium (HPGe) detector. No evidence axion were observed constraints on couplings versus mass within framework invisible models placed. approach provides unique probe for keV-MeV range not accessible to other techniques.
It has early been pointed out by R S Raghavan et al. that in solar matter, conversion of the electron neutrino to a heaver flavor MSW effect can catalyze decay small mixing angle solution. Since recent results on neutrinos provide hints large solution could be correct, we present detailed study with for both and angles. The lower limit lifetime 10 MeV is estimated τ(10 MeV) 103 s.
Abstract A giant ionospheric hole was simultaneously detected in the in-situ measurements of FORMOSAT-7/COSMIC-2 (F7/C2), Ionospheric Connection Explorer (ICON), Swarm missions, and ground-based total electron content (TEC) by global navigation satellite system receivers, F7/C2 Global Ionosphere Specification (GIS) data near Tonga, following explosive volcano eruption on 15 January 2022. The TEC maps displayed huge depletions that developed Tonga after gradually evolved. ICON IVM, IVM...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Geophysical Research Letters. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]Extreme poleward expanding super plasma bubbles triggered Tonga volcano eruption during recovery phase of geomagnetic stormAuthorsP. K.RajeshiDCharles C....