A5018349733- Solar and Space Plasma Dynamics
- Astrophysical Phenomena and Observations
- Ionosphere and magnetosphere dynamics
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Pulsars and Gravitational Waves Research
- Astronomy and Astrophysical Research
- Calibration and Measurement Techniques
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Advanced X-ray Imaging Techniques
- Galaxies: Formation, Evolution, Phenomena
- Particle Detector Development and Performance
- Earthquake Detection and Analysis
- Planetary Science and Exploration
- CCD and CMOS Imaging Sensors
- Nuclear Physics and Applications
- Magnetic confinement fusion research
- Scientific Measurement and Uncertainty Evaluation
- Atmospheric Ozone and Climate
- Infrared Target Detection Methodologies
- High-pressure geophysics and materials
University of Leicester
2016-2025
National Institute for Astrophysics
2019
University of Ferrara
2019
University of Geneva
2019
Czech Technical University in Prague
2017-2019
Kazan Federal University
2017-2019
Mars Space (United Kingdom)
2019
University College London
2017
University of Baltimore
2009
Johns Hopkins University
2009
The EPIC focal plane imaging spectrometers on XMM-Newton use CCDs to record the images and spectra of celestial X-ray sources focused by three mirrors. There is one camera at focus each mirror; two cameras contain seven MOS CCDs, while third uses twelve PN defining a circular field view 30′ diameter in case. were specially developed for EPIC, combine high quality with spectral resolution close Fano limit. A filter wheel carrying kinds transparent light blocking filter, fully closed, open...
The first all-sky survey for cosmic sources of extreme-ultraviolet radiation has been carried out with the UK Wide Field Camera on ROSAT. A reduction data yielded a catalogue 383 relatively bright EUV sources, forming WFC Bright Source Catalogue. This represents 30-fold increase in number astrophysical objects detected ~ 60–200 eV energy band and covers flux range, each two bands, more than 2000. search (typically 1-arcmin) error circles using variety catalogues SIMBAD base, identified...
Both heliophysics and planetary physics seek to understand the complex nature of solar wind's interaction with system obstacles like Earth's magnetosphere, ionospheres Venus Mars, comets. Studies this objective are frequently conducted help single or multipoint in situ electromagnetic field particle observations, guided by predictions both local global numerical simulations, placed context observations from far extreme ultraviolet (FUV, EUV), hard X-ray, energetic neutral atom imagers (ENA)....
Abstract The Lunar Environment heliospheric X-ray Imager (LEXI) is a wide field-of-view soft telescope developed to study solar wind-magnetosphere coupling. LEXI part of the Blue Ghost 1 mission comprised 10 payloads be deployed on lunar surface. monitors dayside magnetopause position and shape as function time by observing X-rays (0.1–2 keV) emitted from wind charge-exchange between exospheric neutrals high charge-state plasma in magnetosheath. Measurements are used test temporal models...
Aims. We describe a method for identifying XMM-Newton observations that have been affected by solar wind charge exchange (SWCX) emission and present preliminary results of previously unidentified cases such within the Science Archive.
Aims. We wished to analyse a sample of observations from the XMM-Newton Science Archive search for evidence exospheric solar wind charge exchange (SWCX) emission.
Abstract The soft X‐ray emissions from the Earth's magnetosheath and cusp regions are simulated under different solar wind conditions, based on PPMLR‐MHD code. images observed by a hypothetical telescope presented, basic responses of magnetopause discernable in these images. From certain viewing geometries, position equatorial plane, as well latitudinal scales azimuthal extent can be directly extracted With reconstructed positions, issues we able to analyze include but not limited...
Abstract The LEXI and SMILE missions will provide soft X‐ray images of the Earth's magnetosheath cusps after their anticipated launch in 2023 2024, respectively. IBEX mission showed potential an Energetic Neutral Atom (ENA) instrument to image dayside cusps, albeit over long hours required raster with a single pixel imager. Thus, it is timely discuss two imaging techniques relevant science topics. We simulate low‐ENA that might be observed by virtual spacecraft during interesting solar wind...
The Soft X-ray Imager (SXI) is part of the scientific payload Solar wind Magnetosphere Ionosphere Link Explorer (SMILE) mission. SMILE a joint science mission between European Space Agency (ESA) and Chinese Academy Sciences (CAS) due for launch in 2025. SXI compact telescope with wide field-of-view (FOV) capable encompassing large portions Earth's magnetosphere from vantage point orbit. sensitive to soft X-rays produced by Wind Charge eXchange (SWCX) process when heavy ions solar origin...
XMM-Newton observations of the Crab provide new information on its integrated X-ray spectrum and variation spectral form across nebula. The pulsar surrounding torus exhibit hardest spectra with power-law indices 1.8. jet outer reaches nebula are significantly softer 2.3 respectively. For whole nebula, huge number recorded counts allows a detailed examination soft absorption due to cool gas in foreground Crab. Absorption edges oxygen neon clearly identified. Oxygen iron interstellar medium...
We present the observation of Tycho supernova remnant obtained with EPIC and RGS instruments onboard XMM-Newton satellite. compare images azimuthally averaged radial profiles in emission lines from different elements (silicon iron) transition iron (Fe L Fe K). While Fexvii line Sixiii K are globally spatially coincident, clearly peaks at a smaller radius, indicating higher temperature toward reverse shock. This is qualitatively profile expected when shock, after travelling through outer...
The Solar wind Magnetosphere Ionosphere Link Explorer (SMILE) is a collaborative science mission between ESA and the Chinese Academy of Sciences (CAS). SMILE novel self-standing to observe coupling solar Earth's magnetosphere via X-Ray imaging -- interaction zones, UV global auroral distributions simultaneous in-situ wind, magnetosheath plasma magnetic field measurements. proposal was submitted by consortium European, Canadian scientists following joint call for CAS. It formally selected...
Abstract Imaging is one of the essential techniques to observe astronomical structures. While analyzing observed images, it a challenge in many scientific fields reconstruct 3‐D structures from 2‐D image(s). This report discusses this context reconstructing structure Earth's magnetosphere X‐ray image and presents new technique. Specifically, finds optimum match tangent directions derived parameterized magnetopause function. We name approach as fitting (TFA). TFA further validated based on...
Abstract A major challenge in solar‐terrestrial physics is to understand the large‐scale dynamics of planetary magnetospheres, such as motion Earth's magnetopause. Currently, a combination situ measurements and numerical modeling has been used address this challenge, but no global imaging available. The discovery soft X‐rays by solar wind charge exchange (SWCX) process offers an opportunity image emitted X‐ray photons. SMILE mission, due for launch late 2025, will carry wide field view...
view Abstract Citations (108) References (30) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The X-Ray Spectral Variability of the BL Lacertae Type Object PKS 2155-304 Sembay, S. ; Warwick, R. Urry, C. M. Sokoloski, J. George, I. Makino, F. Ohashi, T. Tashiro, We present a detailed study hard X-ray properties object based on measurements made in 1988 and 1989 with Large Area Counter (LAC) board Ginga satellite. source exhibited high degree variability...
We present the analysis of an observation by XMM-Newton that exhibits strongly variable, low-energy diffuse X-ray line emission. reason this emission is due to localised solar wind charge exchange (SWCX), originating from a passing cloud plasma associated with Coronal Mass Ejection (CME) interacting neutrals in Earth's exosphere. This case SWCX much richer spectrum comparison previous examples geocoronal or interplanetary space. show OVIII very prominent spectrum. The observed flux oxygen...
Aims. We aim to examine the relative cross-calibration accuracy of on-axis effective areas XMM-Newton EPIC pn and MOS instruments.
We describe the development, launch into space, and initial results from a prototype wide field-of-view soft X-ray imager that employs lobster-eye optics targets heliophysics, planetary, astrophysics science. The sheath transport observer for redistribution of mass is first instrument using this type launched space provides proof-of-concept future flight instruments capable imaging structures such as terrestrial cusp, entire dayside magnetosheath outside magnetosphere, comets, Moon, solar...
Abstract This paper simulates the Kelvin‐Helmholtz wave (KHW)‐induced X‐ray emissions at low‐latitude magnetopause based on a global MHD code. A method is proposed to extract KHW information from intensity measured by hypothetical telescope onboard satellite assumed with low Earth orbit. Specifically, high latitude subtracted map as background highlight role of KHW. Using this method, features such vortex velocity, perturbation degree, spatial distribution, and temporal evolution could be...
Abstract Soft X‐ray imagers can be used to study the mesoscale and macroscale density structures that occur whenever wherever solar wind encounters neutral atoms at comets, Moon, both magnetized unmagnetized planets. Charge exchange between high charge state ions exospheric neutrals results in isotropic emission of soft photons with energies from 0.1 2.0 keV. At Earth, this process occurs primarily within magnetosheath cusps. Through providing a global view, wide field‐of‐view imaging...
Abstract The Earth's magnetosheath and cusps are the sources of soft X‐rays. In accompanying paper (Part 1) this paper, we discuss methods finding magnetopause position by analyzing X‐ray images. We use software developed for Soft Imager (SXI) on board forthcoming Solar wind Magnetosphere Ionosphere Link Explorer (SMILE) mission. show how to find maximum SXI count rate in noisy maps. verify assumption that emissivity integrated along Line‐of‐Sight ( Ix ) is tangent magnetopause. consider two...
<i>Context. <i/>The second XMM-<i>Newton<i/> serendipitous source catalogue, 2XMM, provides the ideal data base for performing a statistical evaluation of flux cross-calibration European Photon Imaging Cameras (EPIC).<i>Aims. <i/>We aim to evaluate status relative calibration EPIC cameras on board observatory (MOS1, MOS2, and pn) investigate dependence energy (from 0.2 12.0 keV), position sources in field view X-ray detectors, lifetime mission.<i>Methods. compiled distribution percentage...
Abstract Imaging magnetospheric satellite missions provide information, which is complementary to in situ observations. often able an instantaneous picture of large‐scale structures, whereas measurements, even multipoint can only average view structure. But imaging also presents some challenges. When three‐dimensional structures need be extracted from two‐dimensional images, it necessary either make suitable assumptions or record a large enough number images different viewing geometries...
We desire a simple comparison of the absolute effective areas current generation CCD instruments onboard following observatories: Chandra ACIS-S3, XMM-Newton (EPIC-MOS and EPIC-pn), Suzaku XIS, Swift XRT straightforward time-dependent response these across their respective mission lifetimes. have been using 1E 0102.2-7219, brightest supernova remnant in Small Magellanic Cloud, to evaluate modify models instruments. 0102.2-7219 has strong lines O, Ne, Mg below 1.5 keV little or no Fe emission...
Abstract The magnetosheath and near‐Earth solar wind emit X‐rays due to charge‐exchange between the extended atmosphere highly ionized particles in wind. These emissions can be used remotely sense dynamic processes this region. Solar Wind Magnetosphere Ionosphere Link Explorer mission will carry out these measurements. In a previous paper, we looked at effect of photon counting statistics on determining location magnetopause bow shock. paper explore, through simulations, more challenging...