A5047928550- Ionosphere and magnetosphere dynamics
- Earthquake Detection and Analysis
- Solar and Space Plasma Dynamics
- GNSS positioning and interference
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- earthquake and tectonic studies
- Spacecraft Design and Technology
- Satellite Communication Systems
- Astro and Planetary Science
- GaN-based semiconductor devices and materials
- Spacecraft and Cryogenic Technologies
- Atmospheric Ozone and Climate
- Seismology and Earthquake Studies
- Atmospheric and Environmental Gas Dynamics
- Geochemistry and Geologic Mapping
- Planetary Science and Exploration
- ZnO doping and properties
- Methane Hydrates and Related Phenomena
- Seismic Waves and Analysis
- Ga2O3 and related materials
- Plasma Diagnostics and Applications
- Tropical and Extratropical Cyclones Research
- Inertial Sensor and Navigation
- Computational Physics and Python Applications
National Central University
2015-2025
Institute of Space Science - INFLPR Subsidiary
2012-2019
Atomic Energy Council
2009
Institute of Nuclear Energy Research
2009
National Tsing Hua University
2003
Hewlett-Packard (United States)
2002-2003
The global distribution of the occurrence rate for density irregularities at 600 km topside ionosphere between ±35° geographic latitudes has been studied with ROCSAT data during moderate to high solar activity years 1999 2004. result indicates that intermediate‐scale (0.1 50 km) can be grouped into two different populations, one in equatorial region and other middle‐to‐subauroral latitude region. seasonal/longitudinal (s/l) current report reproduces McClure et al. (1998) obtained AE‐E...
Monthly variation of global equatorial density irregularity distribution has been obtained with the data taken by ROCSAT‐1 at 600 km topside ionosphere from March 1999 to June 2004 during high moderate solar activity years. This monthly occurrence rate not only provides best spatial/temporal in existence so far but also serves fill gap missing over some eastern Pacific region where no ground observation is available. The 5 1/2‐year result pattern indicates a smooth across longitudes contrary...
A geomagnetic storm occurred on 3 March 2024, with the minimum SYM-H reaching −127 nT. Although this was not very strong, ionospheric irregularities day resulted in a strong scintillation. The amplitude scintillation index larger than 1.0. Global Navigation Satellite System (GNSS) receivers experienced numerous cycle slips and loss of lock carrier phase over large longitudinal range ~30 degrees within ~5 h south China. occurrence such long duration extensive is rarely reported. Ground-based...
HyperSCAN (Hyper Spectral Camera ANalyzer) is a hyperspectral imager which monitors the Earth’s environment and also an educational platform to integrate college students’ ideas skills in optical design data processing. The advantages of are that it designed for modular design, compact lightweight, low-cost using commercial off-the-shelf (COTS) components. allows flexible rapid development, as well validation within lab environments. To optimize space utilization reduce path, HyperSCAN’s...
A FORMOSAT-5 (FS-5) satellite was launched on 25 August 2017 CST into a 98.28° inclination sun-synchronous circular orbit at 720 km altitude along the 1030/2230 local time sectors.  Advanced Ionospheric Probe (AIP), piggyback science payload developed by National Central University for satellite, has measured in-situ ionospheric plasma concentrations 1,024 Hz sampling rate over wide range of spatial scales more than 7 years.  Dramatical density and velocity...
Abstract The 28 September 2018 magnitude Mw7.8 Palu, Indonesia earthquake (0.178° S, 119.840° E, depth 13 km) occurred at 10:02 UTC. major triggered catastrophic liquefaction, landslides, and a near-field tsunami. ionospheric total electron content (TEC) derived from records of 5 ground-based global navigation satellite system (GNSS) receivers is employed to detect tsunami traveling disturbances (TTIDs). In total, 15 TTIDs have been detected. ray-tracing beamforming techniques are then used...
Regions outside of Low Earth Orbit (LEO, altitudes above approximately 1000 km) are classified as "deep space", including Medium (MEO), geostationary orbit (GEO), well cislunar and lunar space. The deep space environment poses many challenges for human robotic exploration, stronger ionizing radiation fluxes, more extreme temperature variations, limited data downlink volume. With the growth rideshare hosted payload model aboard government commercial missions, developing capacity to design...
Advanced Ionospheric Probe (AIP) is a piggyback science payload developed by National Central University for FORMOSAT-5 satellite to explore space weather/ climate and seismic precursors associated with strong earthquakes.The AIP an all-in-one plasma sensor that measures ionospheric concentrations, velocities, temperatures in time-sharing way capable of measuring irregularities at sample rate up 8192 Hz over wide range spatial scales.Electroformed gold grids used the theory construct planar...
AIP (advanced ionospheric probe) on board FORMOSAT-5 is a next version and advanced generation science payload of IPEI (ionospheric Plasma Electrodynamics Instrument) ROCSAT-1 (i.e., FORMOSAT-1).We examine the ion density, temperature, velocity probed by ROCSAT-1/IPEI, as well global map (GIM) total electron content (TEC) derived ground-based GPS receivers during 31 March 2002 M6.8 Earthquake in Taiwan to determine whether FORMOSAT-5/AIP can be used detect seismo-ionospheric precursors...
Abstract An annular solar eclipse swept over Taiwan in the early morning on 21 May 2012. This provides an excellent opportunity to study ionospheric response mainly due photochemical effects. Local ground‐based Global Positioning System receivers, ionosonde, high frequency‐continue wave Doppler sounding systems, and very low frequency receivers are used observe signatures. These multiinstrument observations show that extreme total electron content (TEC) depression lags maximum obscuration by...
The first Republic of China Satellite, ROCSAT‐1 at 600 km altitude observed two groups equatorial spread‐ F (ESF) plasma depletion structures located in either side the midnight meridian during 6–7 April 2000 magnetic storm recovery phase. In group postmidnight ESF irregularities, a large density dropout was consecutive ROCSAT orbits. This structure is similar to event by Defense Meteorological Satellite Program (DMSP) F9 spacecraft 13–14 March 1989 [ Greenspan et al. , 1991 ] except that...
Abstract The ionospheric total electron content (TEC) derived from dense ground‐based Global Navigation Satellite System receivers over the continental United States and those global ionosphere maps are utilized to find response August 21, 2017 solar eclipse. Maximum obscurations their associated TEC major depressions appear simultaneously at midlatitudes, while elongate toward magnetic equator with some delays in equatorial ionization anomaly (EIA) region. former is due photochemical loss...
The quiet‐time low‐ and mid‐latitude topside ionospheric ion temperature measured with ROCSAT‐1/IPEI instrument is studied for local time, longitudinal, latitudinal, seasonal variations the solar maximum year of 2000. statistical result shows two significant observations at presunrise sector. Namely, earliest increase 600 km ionosphere always starts in winter hemisphere both summer seasons; strongest ion‐heating region located longitudinal between 165° 195° during June 285° 345° December...
We demonstrate the growth of indium nitride (InN) nanorods on sapphire by chemical-beam epitaxy without a catalyst. The are synthesized nearly unidirectionally along ⟨001⟩ direction and diameters varied in range 20–40nm with In∕N flow ratio. Single-crystalline wurtzite structure is verified x-ray diffraction transmission electron microscopy. Raman measurements show that these InN have sharp peaks E2 (high) at 491cm−1 A1 (LO) 593cm−1.
Neutral winds and turbulence structure in the mesosphere lower thermosphere were measured with a sounding rocket chemical release experiment carried out Taiwan. Trimethyl aluminum (TMA) was used as tracer of drift background atmosphere. The results show that neutral wind had maximum speed 154 m/s at height around 105 km. vectors found to rotate clockwise altitude range from about 98 121 On basis hodograph analysis vectors, an upward propagating inertio‐gravity wave intrinsic period 11.2...
While the ion and electron temperatures inside equatorial plasma bubbles (EPBs) are normally lower than those in an ambient plasma, with enhanced (BETs) found occasionally topside ionosphere. Here we report characteristics of BETs identified from observations first Republic China Satellite (ROCSAT‐1), Korea Multi‐purpose (KOMPSAT‐1), Defense Meteorological Program (DMSP) F15 during solar maximum period between 2000 2001. The oxygen fraction BETs, which was no that ionosphere, similar to case...
Abstract Studies on low‐/mid‐latitude ionospheric irregularities have a long history, but ion temperature and drift velocity variations within the been rarely investigated, especially at mid‐latitudes. To fill this knowledge gap, we statistically investigate of mid‐latitude compare them to those low‐latitude ones. This study mainly relies in situ plasma moment data from newly launched Ionospheric Connection Explorer (ICON) satellite is supplemented by Republic China Satellite 1 (ROCSAT‐1)...
Global averaged postsunset equatorial ionospheric density irregularity occurrences observed by ROCSAT during the moderate to high solar activity years of 1999 2004 indicate a different local time distribution between June and December solstices. The solstice show faster increase rate peak at 2100–2200 time, while have slower one hour later in than that solstice. cause such distributions is attributed large contrast zonal drift reversal magnitude vertical longitudes magnetic declination two...
Contrasting longitudinal variation in equatorial spread‐F (ESF) density irregularity distribution has been observed by ROCSAT‐1 during high solar activity year of 2000 against moderate 2003. The monthly averaged flux intensity F 10.7 was higher every month than 2003, but the occurrence rate did not always correlate with at longitude a season. For equinox seasons, Higher also 2003 solstice season longitudes so‐called ESF longitudes. On other hand, rates were low‐ESF from 230° to 10° June and...
Abstract The mission of Advanced Ionospheric Probe (AIP) onboard FORMOSAT-5 (F5) satellite is to detect pre-earthquake ionospheric anomalies (PEIAs) and observe space weather. F5/AIP plasma quantities in the nighttime 22:30 LT (local time) total electron content (TEC) global ionosphere map (GIM) are used study PEIAs an M7.3 earthquake Iran–Iraq border area on 12 November 2017, as well signatures two magnetic storms 7 21–22 2017. Statistical analyses median base one sample test employed find...
One of the Ionospheric Plasma and Electrodynamics Instrument (IPEI) payload onboard Republic China satellite 1 (ROCSAT-1) spacecraft is a Retarding Potential Analyzer (RPA) to measure ionospheric plasma composition, temperature, ram velocity flow. A three-dimensional computer model has been developed simulate ion electron motions inside RPA IPEI payload. The dynamical changes in charged particles’ corresponding different electric potential profiles detector resulted some distinctive...