A5065661793- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Solar Radiation and Photovoltaics
- Geomagnetism and Paleomagnetism Studies
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Adrenal Hormones and Disorders
- Laser-Plasma Interactions and Diagnostics
- Pituitary Gland Disorders and Treatments
- Particle Detector Development and Performance
- Growth Hormone and Insulin-like Growth Factors
- Spacecraft and Cryogenic Technologies
- Spacecraft Design and Technology
- CCD and CMOS Imaging Sensors
- Planetary Science and Exploration
- Atmospheric Ozone and Climate
- Radiation Therapy and Dosimetry
- Nuclear Physics and Applications
- Geophysics and Gravity Measurements
- Earthquake Detection and Analysis
- Particle Accelerators and Free-Electron Lasers
- Diabetes and associated disorders
- Magnetic confinement fusion research
- Diabetes Management and Research
FHNW University of Applied Sciences and Arts
2014-2024
University of Glasgow
2010-2023
Urban College of Boston
2023
Goddard Space Flight Center
2023
Laboratory for Atmospheric and Space Physics
2023
HES-SO University of Applied Sciences and Arts Western Switzerland
2021
Benaroya Research Institute
2018
Lawrence Berkeley National Laboratory
2010-2012
ETH Zurich
2003-2011
GSI Helmholtz Centre for Heavy Ion Research
2010
Aims. The Spectrometer Telescope for Imaging X-rays (STIX) on Solar Orbiter is a hard X-ray imaging spectrometer, which covers the energy range from 4 to 150 keV. STIX observes bremsstrahlung emissions solar flares and therefore provides diagnostics of hottest (⪆10 MK) flare plasma while quantifying location, spectrum, content flare-accelerated nonthermal electrons. Methods. To accomplish this, applies an indirect bigrid Fourier technique using set tungsten grids (at pitches 0.038 1 mm) in...
X-ray spectroscopy is used to obtain single-shot information on electron beam emittance in a low-energy-spread 0.5 GeV-class laser-plasma accelerator. Measurements of betatron radiation from 2 20 keV CCD and single-photon counting techniques. By matching x-ray spectra models, the bunch radius inside plasma estimated be $\ensuremath{\sim}0.1\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$. Combining this with simultaneous spectra, normalized transverse as low 0.1 mm mrad, consistent...
We report on high-resolution optical and hard X-ray observations of solar flare ribbons seen during the GOES X6.5 class white-light 2006 December 6. The data consist imaging at 430 nm (the Fraunhofer G band) taken by Hinode Solar Optical Telescope with X-rays observed Reuven Ramaty High Energy Spectroscopic Imager. two sets show closely similar ribbon structures, strongly suggesting that emissions in white light have physically linked emission mechanisms. While source structure along is...
OBJECTIVE A pilot study suggested that combination therapy with low-dose anti-thymocyte globulin (ATG) and pegylated granulocyte colony-stimulating factor (GCSF) preserves C-peptide in established type 1 diabetes (T1D) (duration 4 months to 2 years). We hypothesized 1) ATG/GCSF or 2) ATG alone would slow the decline of β-cell function patients new-onset T1D <100 days). RESEARCH DESIGN AND METHODS three-arm, randomized, double-masked, placebo-controlled trial was performed by Type...
Solar Orbiter is the first space mission observing solar plasma both in situ and remotely, from a close distance, out of ecliptic. The ultimate goal to understand how Sun produces controls heliosphere, filling System driving planetary environments. With six remote-sensing four in-situ instrument suites, coordination planning operations are essential address following top-level science questions: (1) What drives wind where does coronal magnetic field originate? (2) How do transients drive...
Context: Solar flares release a large fraction of their energy into non-thermal electrons, but it is not clear where and how. Bremsstrahlung X-rays are observed from the corona chromosphere. Aims: We aim to characterize acceleration process by coronal source its leakage toward footpoints in The relations between sources reflect geometry constrict configuration flare. Methods: studied solar GOES class larger than M1 with three or more hard X-ray simultaneously course events were satellite...
Current data clearly demonstrate that sports-related chronic repetitive head trauma due to boxing might result in hypopituitarism. However, the mechanism of traumatic brain injury-induced pituitary dysfunction is still unclear. In order understand whether autoimmune mechanisms could play a role trauma, we investigated presence antipituitary antibodies (APAs) and antihypothalamus (AHAs) amateur boxers.Sixty-one actively competing (n=44) or retired (n=17) male boxers (mean age, 26 years;...
The limb flare SOL2012-07-19T05:58 (M7.7) provides the best example of a non-thermal above-the-loop-top hard X-ray source with simultaneous observations by Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) and Atmospheric Imaging Assembly on board Dynamic Observatory. By combining two sets observations, we present first direct measurement thermal proton density electron within where particle acceleration occurs. We find that both densities are same order magnitude few times 109...
We investigate the sequence of events leading to solar X1 flare SOL2014-03-29T17:48. Because unprecedented joint observations an X-flare with ground-based Dunn Solar Telescope and spacecraft IRIS, Hinode, RHESSI, STEREO, Dynamics Observatory, we can sample many layers from photosphere corona. A filament eruption was observed above a region previous flux emergence, which possibly led change in magnetic field configuration, causing X-flare. This concluded timing location hard X-ray emission,...
While anti-pituitary antibodies (APAs) were detected in some patients with Sheehan's syndrome (SS) suggesting an autoimmune pituitary involvement the development of their hypopituitarism, hypothalamic cell anti-hypothalamus (AHAs) have not been investigated so far.The aim this study was to evaluate presence AHA and APA SS verify whether hypothalamic-pituitary process can contribute late hypopituitarism.Twenty women a duration disease ranging from 3 40 years (median 25.5 years) enrolled into...
We report analysis of three solar flares that occur within 1° limb passage, with the goal to investigate source height chromospheric footpoints in white light (WL) and hard X-rays (HXR). find WL HXR (≥30 keV) centroids be largely co-spatial from similar heights for all events, altitudes around 800 km above photosphere or 300–450 height. Because extreme location events we study, emissions such low are influenced by opacity atmosphere projection effects. STEREO images reveal...
Magnetic reconnection, the central engine that powers explosive phenomena throughout Universe, is also perceived as one of principal mechanisms for accelerating particles to high energies. Although various signatures magnetic reconnection have been frequently reported, observational evidence links particle acceleration directly site has rare, especially space plasma environments currently inaccessible $\textit{in situ}$ measurements. Here we utilize broadband radio dynamic imaging...
Non-thermal and thermal parameters of 85 solar flares GOES class B1 to M6 (background subtracted classes A1 M6) have been compared each other. The hard X-ray flux has measured by RHESSI a spectral fitting provided index the non-thermal emission, as well temperature emission measure emission. soft was taken from measurements. We find linear correlation in double logarithmic plot between index. higher acceleration rate flare, harder electron distribution. relation is similar one found...
In the classical flare picture, hard X-ray emission from chromosphere is succeeded by soft-X-ray hot plasma in loop, soft being a direct consequence of impact non-thermal particle beam. However, observations events exist which pronounced increase observed minutes before onset emission. Such pre-flare clearly contradicts picture. For first time, phase such solar flares studied detail. We want to explain time evolution means alternative energy transport mechanisms as heat conduction. RHESSI...
We present high spatial resolution observations of chromospheric evaporation in the flare SOL2014-03-29T17:48. Interface Region Imaging Spectrograph Fe xxi line indicate evaporating plasma at a temperature 10 MK along ribbon during peak and several minutes into decay phase with upflow velocities between 30 200 km s−1. Hard X-ray (HXR) footpoints were observed by Ramaty High Energy Solar Spectroscopic Imager for two flare. Their locations coincided upflows parts southern but HXR footpoint...
Context. To meet the scientific objectives of mission, Solar Orbiter spacecraft carries a suite in-situ (IS) and remote sensing (RS) instruments designed for joint operations with inter-instrument communication capabilities. Indeed, previous missions have shown that Sun (imaged by RS instruments) heliosphere (mainly sampled IS should be considered as an integrated system rather than separate entities. Many advances expected from rely on this synergistic approach between measurements. Aims....
Objective measurements are required for computer-aided sperm morphometric analysis (CASMA) machines to distinguish normal from abnormal heads. The characteristics of spermatozoa in 72 samples semen and other after swim-up were quantified by the semi-automated Integrated Sperm Analysis System (ISAS) system, which measured head parameters length (L), width (W), area (A), perimeter (P), acrosomal (Ac), derived values L/W P/A. For each man a homogeneous population distributions characterized...
The newly developed X-ray visibility forward fitting technique is applied to Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) data of a limb flare investigate the energy and height dependence on sizes, shapes, position hard chromospheric footpoint sources. This provides information about electron transport density structure. spatial distribution two sources analyzed using PIXON, Maximum Entropy Method, CLEAN fit algorithms at nonthermal energies from $\sim 20$ 200$ keV. We...
X-ray and EUV observations are an important diagnostic of various plasma parameters the solar atmosphere during flares. Soft often show coronal sources near top flaring loops, while hard emission is mostly observed from chromospheric footpoints. Combining RHESSI with simultaneous SDO/AIA observations, it possible for first time to determine density, temperature, profile over a wide range heights flare, using two independent methods. Here we analyze limb event three peaks. The measure,...
A statistical study of the correlation between hard X-ray and white light emission in solar flares is performed order to search for a link flare-accelerated electrons formation. We analyze 43 spanning GOES classes M X using observations from RHESSI (Reuven Ramaty High Energy Solar Spectroscopic Imager) HMI (Helioseismic Magnetic Imager). calculate fluxes at 30 keV 6173 \r{A} summed over flare ribbons with an integration time 45 seconds around peak hard-X ray time. find good excess fluxes,...