G. Furlich
A5035875190- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Radio Astronomy Observations and Technology
- Lightning and Electromagnetic Phenomena
- Ionosphere and magnetosphere dynamics
- Particle Detector Development and Performance
- CCD and CMOS Imaging Sensors
- Infrared Target Detection Methodologies
- Solar and Space Plasma Dynamics
- Earthquake Detection and Analysis
- Particle Accelerators and Free-Electron Lasers
- Gamma-ray bursts and supernovae
- Calibration and Measurement Techniques
- Advanced Measurement and Detection Methods
- Image Processing Techniques and Applications
- Scientific Research and Discoveries
- Astronomy and Astrophysical Research
- Fire effects on ecosystems
- Power Line Communications and Noise
- Atmospheric Ozone and Climate
- Precipitation Measurement and Analysis
- High-Energy Particle Collisions Research
- Sparse and Compressive Sensing Techniques
University of Utah
2018-2024
Lockheed Martin (United States)
2022
Saitama University
2021
The Telescope Array observatory utilizes fluorescence detectors and surface to observe air showers produced by ultra high energy cosmic rays in the Earth's atmosphere. Cosmic ray events observed this way are termed hybrid data. depth of shower maximum is related mass primary particle that generates shower. This paper reports on maxima data collected over 8.5 years using Black Rock Mesa Long Ridge conjunction with array detectors. We compare means standard deviations $X_{\mathrm{max}}$...
We report on a measurement of the cosmic ray energy spectrum by Telescope Array Low-Energy Extension (TALE) air fluorescence detector. The TALE detector is also sensitive to Cherenkov light produced shower particles. Low rays, in PeV range, are detectable as "Cherenkov Events". Using these events, we measure from low $\sim 2$ an greater than 100 PeV. Above can detect rays using fluorescence. This allows for extension energies few EeV. In this paper, will describe detector, explain technique,...
Abstract Bursts of gamma ray showers have been observed in coincidence with downward propagating negative leaders lightning flashes by the Telescope Array Surface Detector (TASD). The TASD is a 700‐km 2 cosmic observatory located southwestern Utah, USA. In data collected between 2014 and 2016, correlated observations showing structure temporal development three shower‐producing were obtained 3‐D mapping array, electric field change measurements for an additional seven flashes, both cases...
One of the uncertainties in interpretation ultrahigh energy cosmic ray data comes from hadronic interaction models used for air shower Monte Carlo (MC) simulations. The number muons observed at ground ray--induced showers is expected to depend upon model. may therefore test by comparing measured with MC prediction. In this paper, we present results studies muon densities extensive obtained analyzing signal surface detector stations which should have high purity. purity a station will on both...
In this paper we report the first close, high-resolution observations of downward-directed terrestrial gamma-ray flashes (TGFs) detected by large-area Telescope Array cosmic ray observatory, obtained in conjunction with broadband VHF interferometer and fast electric field change measurements parent discharge. The results show that TGFs occur during strong initial breakdown pulses (IBPs) few milliseconds negative cloud-to-ground low-altitude intracloud flashes, IBPs are produced a...
The results on ultrahigh-energy cosmic rays (UHECR) mass composition obtained with the Telescope Array surface detector are presented. analysis employs Boosted Decision tree (BDT) multivariate built upon 14 observables related to both properties of shower front and lateral distribution function. classifier is trained Monte-Carlo sets events induced by primary protons iron. An average atomic UHECR presented for energies $1{0}^{18.0}--1{0}^{20.0}\text{ }\text{ }\mathrm{eV}$. particles shows no...
We report on a measurement of the cosmic ray composition by Telescope Array Low-Energy Extension (TALE) air fluorescence detector (FD). By making use Cherenkov light signal in addition to from (CR) induced extensive showers, TALE FD can measure properties rays with energies as low $\sim 2$ PeV and exceeding 1 EeV. In this paper, we present results $X_{\rm max}$ distributions showers observed over energy range. Data collected period 4$ years was analyzed for study. The resulting are compared...
Abstract In this paper, we present the first high‐speed video observation of a cloud‐to‐ground lightning flash and its associated downward‐directed Terrestrial Gamma‐ray Flash (TGF). The optical emission event was observed by camera running at 40,000 frames per second in conjunction with Telescope Array Surface Detector, Lightning Mapping Array, interferometer, electric‐field fast antenna, National Detection Network. TGF formed downward leader followed very intense return stroke peak current...
Abstract The Pierre Auger Collaboration (Auger) recently reported a correlation between the arrival directions of cosmic rays with energies above 39 EeV and flux pattern 23 nearby starburst galaxies (SBGs). In this Letter, we tested same hypothesis using detected by Telescope Array experiment (TA) in 9 yr period from 2008 May to 2017 May. Unlike analysis, did not optimize parameter values but kept them fixed best-fit found Auger, namely 9.7% for anisotropic fraction assumed originate SBGs...
Abstract Motivated by the detection of a significant dipole structure in arrival directions ultra-high-energy cosmic rays above 8 EeV reported Pierre Auger Observatory (Auger), we search for large-scale anisotropy using data collected with surface detector array Telescope Array Experiment (TA). With 11 yr TA data, projection R.A. is fitted an amplitude 3.3% ± 1.9% and phase 131° 33°. The corresponding 99% confidence-level upper limit on 7.3%. At current level statistics, result compatible...
Abstract Evidence for a large-scale supergalactic cosmic-ray multiplet (arrival directions correlated with energy) structure is reported ultra-high-energy (UHECR) energies above 10 19 eV using 7 years of data from the Telescope Array (TA) surface detector and updated to years. Previous energy–position correlation studies have made assumptions regarding magnetic field shapes strength, UHECR composition. Here assumption tested that, because plane fit average matter density local structure,...
Ultrahigh energy cosmic rays provide the highest known source in Universe to measure proton cross sections. Though conditions for collecting such data are less controlled than an accelerator environment, current generation ray observatories have large enough exposures collect significant statistics a reliable measurement energies above what can be attained laboratory. Cosmic measurements of section use atmospheric calorimetry depth air shower maximum (${X}_{\mathrm{max}}$), which is related...
Telescope Array (TA) is the largest experiment in Northern Hemisphere studying ultrahigh energy cosmic rays. TA measurements of ray spectrum using surface detector have best statistical power experiment, and observe ankle high cutoff. When data are divided into two declination bands, above below 24.8 degrees, cutoff appears at $10^{19.64 \pm 0.04}$ ($10^{19.84 0.02}$) eV lower (higher) band, an difference 58\%. The global significance 4.3 standard deviations. lack instrumental cause this...
An intermediate-scale energy spectrum anisotropy has been found in the arrival directions of ultra-high cosmic rays energies above $10^{19.2}$ eV northern hemisphere, using 7 years data from Telescope Array surface detector. A relative distribution test is done comparing events inside oversampled spherical caps equal exposure, to those outside, Poisson likelihood ratio. The center maximum significance at $9^h$$16^m$, $45^{\circ}$. and a deficit with $10^{19.2}$$\leq$$E$$<$$10^{19.75}$ an...
The Telescope Array Collaboration has observed an excess of events with $E \ge 10^{19.4} ~{\rm eV}$ in the data which is centered at (RA, dec) = ($19^\circ$, $35^\circ$). This near center Perseus-Pisces supercluster (PPSC). PPSC about $70 Mpc}$ distant and closest Northern Hemisphere (other than Virgo we are a part). A Li-Ma oversampling analysis $20^\circ$-radius circles indicates arrival direction local significance 4 standard deviations. probability having such close to by chance...
Telescope Array (TA) is the largest ultrahigh energy cosmic-ray (UHECR) observatory in Northern Hemisphere. A surface detector (SD) array covers approximately 700 km$^2$, and SD surrounded by three fluorescence (FD) stations. TA has found evidence for a cluster of cosmic rays with energies greater than 57 EeV from data. In order to confirm this more data, we started TAx4 experiment which expands detection area using new SDs FDs. We construction are arranged square grid 2.08 km spacing at...
Detection of small, point targets is fundamental in applications such as early warning systems, surveillance, astronomy, and microscopy. The presence noise clutter can make it challenging to detect small while minimizing false detections. This paper presents a method for infrared target detection using convolutional neural networks. proposed augments conventional space-based processing chain with lightweight network predict the probability that target. trained on 7 × pixel windows both image...
The surface detector (SD) of the Telescope Array (TA) experiment allows one to indirectly detect photons with energies order $10^{18}$ eV and higher separate from cosmic-ray background. In this paper we present results a blind search for point sources ultra-high energy (UHE) in Northern sky using TA SD data. photon-induced extensive air showers (EAS) are separated hadron-induced EAS background by means multivariate classifier based upon 16 parameters that characterize shower events. No...
We present updated results of the search for ultra-high energy photons with primary energies greater than 10 EeV. The data Telescope Array Surface Detector collected over 11 years are used in this work. method is based on machine learning classifier, which trained both reconstructed composition-sensitive parameters event and calibrated waveform signals at each triggered station Detector.
The Telescope Array (TA) is the largest cosmic ray observatory in Northern Hemisphere. It designed to measure properties of rays over a wide range energies. TA with it's low energy extension (TALE) observe cosmic-ray induced extensive air showers between 2 PeV and 100 EeV hybrid mode using multiple instruments, including an array scintillator detectors at Earth's surface telescopes fluorescence Cerenkov light. statistics highest energies being enhanced ongoing construction TAx4 experiment...
Evidence for a large-scale supergalactic cosmic ray multiplet (arrival directions correlated with energy) structure is reported ultra-high energy (UHECR) energies above 10$^{19}$ eV using seven years of data from the Telescope Array (TA) surface detector and updated to 10 years. Previous energy-position correlation studies have made assumptions regarding magnetic field shapes strength, UHECR composition. Here assumption tested that, since plane fit average matter density local Large Scale...
The source, propagation and acceleration mechanism of ultra-high-energy cosmic rays (UHECR) have been investigated since the first discovery UHECRs to solve mystery extremely high-energy universe. Telescope Array times 4 (TAx4) experiment, which currently consists 257 Surface Detectors (SDs) 2 Fluorescence Detector (FD) stations, had built in Utah, USA 2019. TAx4 SDs observe secondary particles an extensive air shower induced by UHECR, we reconstruct arrival direction energy UHECR using...
The Telescope Array experiment is an ultra-high energy cosmic ray observatory located in Millard County, Utah, USA. consists of 3 fluorescence detector (FD) stations and 507 surface detectors (SD) that cover area ~$700~ {\rm km}^2$. Hybrid trigger external system for the SD arrays prompts to perform data acquisition when FD detects a shower-like event. In comparison with autonomous trigger, hybrid allows collect air shower has primary below $10^{18.5}~\rm eV$, where efficiency decreases...
We present the first observation by Telescope Array Surface Detector (TASD) of effect thunderstorms on development cosmic ray single count rate intensity over a 700 km$^{2}$ area. Observations variations in secondary low-energy counting rate, using TASD, allow us to study electric field inside thunderstorms, large scale, as it progresses top detector, without dealing with limitation narrow exposure time and space balloons aircraft detectors. In this work, (single rate) were studied found be...