I. Cernuda
A5002532698- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Ionosphere and magnetosphere dynamics
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Solar Radiation and Photovoltaics
- Gamma-ray bursts and supernovae
- Spacecraft Design and Technology
- Stellar, planetary, and galactic studies
- Atmospheric Ozone and Climate
- Nuclear Physics and Applications
- Planetary Science and Exploration
- Atomic and Subatomic Physics Research
- Computational Physics and Python Applications
- Geomagnetism and Paleomagnetism Studies
- Radiation Therapy and Dosimetry
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- solar cell performance optimization
- CCD and CMOS Imaging Sensors
- Radioactive Decay and Measurement Techniques
- Muon and positron interactions and applications
- Geophysics and Gravity Measurements
- Scientific Computing and Data Management
Universidad de Alcalá
2019-2024
Kiel University
2023
Johns Hopkins University Applied Physics Laboratory
2023
Universitat de Barcelona
2023
Southwest Research Institute
2023
Peking University
2023
Catholic University of America
2021
University of Geneva
2015-2017
Swiss Institute of Comparative Law
2015-2017
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2009-2016
A precision measurement by the Alpha Magnetic Spectrometer on International Space Station of positron fraction in primary cosmic rays energy range from 0.5 to 350 GeV based $6.8\ifmmode\times\else\texttimes\fi{}{10}^{6}$ and electron events is presented. The very accurate data show that steadily increasing 10 $\ensuremath{\sim}250\text{ }\text{ }\mathrm{GeV}$, but, 20 250 GeV, slope decreases an order magnitude. spectrum shows no fine structure, ratio observable anisotropy. Together, these...
A precise measurement of the proton flux in primary cosmic rays with rigidity (momentum/charge) from 1 GV to 1.8 TV is presented based on 300 million events. Knowledge dependence important understanding origin, acceleration, and propagation rays. We present detailed variation spectral index for first time. The progressively hardens at high rigidities.Received 6 March 2015DOI:https://doi.org/10.1103/PhysRevLett.114.171103This article available under terms Creative Commons Attribution 3.0...
Measurements of the positron fraction in high energy cosmic rays using space-borne Alpha Magnetic Spectrometer have been extended to energies 500 GeV. The new results show that stops increasing with at around 200
Precision measurements by the Alpha Magnetic Spectrometer on International Space Station of primary cosmic-ray electron flux in range 0.5 to 700 GeV and positron 500 are presented. The each require a description beyond single power-law spectrum. Both change their behavior at ∼30 but fluxes significantly different magnitude energy dependence. Between 20 200 spectral index is harder than index. determination differing indices versus new observation provides important information origins...
Knowledge of the precise rigidity dependence helium flux is important in understanding origin, acceleration, and propagation cosmic rays. A measurement primary rays with (momentum/charge) from 1.9 GV to 3 TV based on 50 million events presented compared proton flux. The detailed variation spectral index for first time. progressively hardens at rigidities larger than 100 GV. similar that though magnitudes are different. Remarkably, ratio increases up 45 then becomes constant; above well...
A precision measurement by AMS of the antiproton flux and antiproton-to-proton ratio in primary cosmic rays absolute rigidity range from 1 to 450 GV is presented based on 3.49×10^{5} events 2.42×10^{9} proton events. The fluxes ratios charged elementary particles are also presented. In ∼60 ∼500 GV, p[over ¯], p, positron e^{+} found have nearly identical dependence electron e^{-} exhibits a different dependence. Below 60 (p[over ¯]/p), ¯]/e^{+}), (p/e^{+}) each reaches maximum. From show no...
We present a measurement of the cosmic ray (e^{+}+e^{-}) flux in range 0.5 GeV to 1 TeV based on analysis 10.6 million events collected by AMS. The statistics and resolution AMS provide precision flux. is smooth reveals new distinct information. Above 30.2 GeV, can be described single power law with spectral index γ=-3.170±0.008(stat+syst)±0.008(energy scale).
After decades of observations solar energetic particles from space-based observatories, relevant questions on particle injection, transport, and acceleration remain open. To address these scientific topics, accurate measurements the properties in inner heliosphere are needed. In this paper we describe Energetic Particle Detector (EPD), an instrument suite that is part payload aboard Solar Orbiter mission. will approach Sun as close 0.28 au provide extra-ecliptic beyond ∼30° heliographic...
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. The Solar Orbiter spacecraft will be equipped with a wide range of remote-sensing (RS) and in situ (IS) instruments to record novel unprecedented measurements the solar atmosphere inner heliosphere. To take full advantage these new datasets, tools techniques must developed ease multi-instrument multi-spacecraft studies. In particular currently inaccessible low corona below two radii can only observed remotely. Furthermore used retrieve coronal plasma properties time three...
Context. On 2020 November 29, the first widespread solar energetic particle (SEP) event of cycle 25 was observed at four widely separated locations in inner (≲1 AU) heliosphere. Relativistic electrons as well protons with energies > 50 MeV were by Solar Orbiter (SolO), Parker Probe, Terrestrial Relations Observatory (STEREO)-A and multiple near-Earth spacecraft. The SEP associated an M4.4 class X-ray flare accompanied a coronal mass ejection extreme ultraviolet (EUV) wave type II radio...
Solar Orbiter strives to unveil how the Sun controls and shapes heliosphere fills it with energetic particle radiation. To this end, its Energetic Particle Detector (EPD) has now been in operation, providing excellent data, for just over a year. EPD measures suprathermal particles energy range from few keV up (near-) relativistic energies (few MeV electrons about 500 MeV/nuc ions). We present an overview of initial results first year operations we provide assessment issues limitations....
Measurement of the chemical and isotopic composition cosmic rays is essential for precise understanding their propagation in galaxy. While model parameters are mainly determined using B/C ratio, study extended sets ratios can provide stronger constraints on models. In this paper, relative abundances light-nuclei lithium, beryllium, boron, carbon presented. The secondary-to-primary Li/C, Be/C, have been measured kinetic energy range 0.35–45 GeV nucleon−1. ratio 7Li/6Li also magnetic rigidity...
The variety of isotopes in cosmic rays allows us to study different aspects the processes that undergo between time they are produced and their arrival heliosphere. In this paper, we present measurements isotopic ratios 2H/4He, 3He/4He, 6Li/7Li, 7Be/(9Be+10Be), 10B/11B range 0.2–1.4 GeV kinetic energy per nucleon. based on data collected by Alpha Magnetic Spectrometer, AMS-01, during STS-91 flight 1998 June.
JUICE was launched in April 2023, and it is now its cruise phase to Jupiter, where scheduled arrive July 2031. carries a radiation monitor, namely the RADiation hard Electron Monitor (RADEM) measure protons, electrons, ions, detecting particles coming from anti-Sun direction. On 2024 May 13, large solar energetic particle (SEP) event took place association with an eruption close western limb of Sun as seen Earth. Providentially, at that time very closely located STEREO-A, difference location...
Title: Investigating Solar Sources of  3He-Rich and  3He-Poor SEP Events in 2024 usingSolar Orbiter HETAuthors:Sindhuja. G1, Robert F. Schweingruber1, Patrick Kühl1, Alexander Kollhoff1, Zheyi Ding1, SebastianFleth1, LarsBerger1, Javier Rodriguez-Pacheco2, George C. Ho3, Glenn M. Mason4, Raul Gomez-Herrero2, Francisco Espinosa Lara2, Ignacio Cernuda2, Stephan Böttcher1, Sandra Eldrum1, andRobert Allen3,1) Institute of Experimental and Applied Physics, Kiel...
Context. Solar Orbiter, launched in February 2020, started its cruise phase June coincidence with first perihelion at 0.51 au from the Sun. The situ instruments onboard, including Energetic Particle Detector (EPD), operate continuously during enabling observation of solar energetic particles. Aims. In measurements near-relativistic electron events observed July 2020 by EPD are analyzed and origins conditions for interplanetary transport these particles investigated. Methods. Electron...
The first orbit of Solar Orbiter provided comprehensive measurements six corotating interaction regions (CIRs) within 1 au. Five these CIRs were also observed by ACE at au, allowing for comparisons the suprathermal ion intensities and spectra different radial distances. Only subtle modulations 4 He spectral slopes are between ACE. Additionally, gradients 226−320 keV/nuc similar to that 1.53 MeV H reported Van Hollebeke et al. (1978, J. Geophys. Res., 83, A10). These observations provide a...
Aims. We present observations of the first coronal mass ejection (CME) observed by Solar Orbiter spacecraft on April 19, 2020 and associated Forbush decrease (FD) measured High Energy Telescope (HET). This CME is a multi-spacecraft event that was also seen near Earth following day. Methods. highlight capabilities HET for observing small short-term variations galactic cosmic ray count rate using its single detector counters. applied analytical ForbMod model to FD measurements reproduce at...
We report observations of five impulsive solar energetic particle (SEP) events observed inside 1 au during the first perihelion pass Solar Orbiter mission, which was launched in February 2020. These small were all reasonably associated with active regions from Earth but had rotated out view by time observations. Even though most small, their spectral forms, 3 He content, and association type III bursts convincingly identifies them as He-rich SEP properties similar to those previously at au....
We report observations of a relatively long period 3 He-rich solar energetic particles (SEPs) measured by Solar Orbiter. The consists several well-resolved ion injections. high-resolution STEREO-A imaging reveal that the injections coincide with extreme ultraviolet jets and brightenings near east limb, not far from nominal magnetic connection originated in two adjacent, large, complex active regions, as observed Dynamics Observatory when regions rotated into Earth’s view. It appears...