A5024870400- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Solar Radiation and Photovoltaics
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Radiation Therapy and Dosimetry
- Atmospheric Ozone and Climate
- Stellar, planetary, and galactic studies
- Geophysics and Gravity Measurements
- Geomagnetism and Paleomagnetism Studies
- Gamma-ray bursts and supernovae
- Planetary Science and Exploration
- Nuclear Physics and Applications
- Spacecraft Design and Technology
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Earthquake Detection and Analysis
- Astronomy and Astrophysical Research
- Spacecraft and Cryogenic Technologies
- Electron and X-Ray Spectroscopy Techniques
- Magnetic confinement fusion research
- Particle Detector Development and Performance
- Photocathodes and Microchannel Plates
- Computational Physics and Python Applications
Kiel University
2016-2025
Fachhochschule Kiel
2015-2024
University of Thessaly
2024
Peking University
2023
Universitat de Barcelona
2021-2023
Southwest Research Institute
2023
Universidad de Alcalá
2016-2023
Johns Hopkins University Applied Physics Laboratory
2023
KBR (United States)
2022
Chinese Academy of Sciences
2020
The Alpha Magnetic Spectrometer (AMS) is a precision particle physics detector on the International Space Station (ISS) conducting unique, long-duration mission of fundamental research in space. objectives include precise studies origin dark matter, antimatter, and cosmic rays as well exploration new phenomena. Following 16-year period construction testing, precursor flight Shuttle, AMS was installed ISS May 19, 2011. In this report we present results based 120 billion charged ray events up...
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...
We present results over an 11-year Solar cycle of cosmic antiprotons based on <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mn>1.1</a:mn><a:mo>×</a:mo><a:msup><a:mn>10</a:mn><a:mn>6</a:mn></a:msup></a:math> events in the rigidity range from 1.00 to 41.9 GV. The <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mover accent="true"><c:mi>p</c:mi><c:mo stretchy="false">¯</c:mo></c:mover></c:math> fluxes exhibit distinct properties. magnitude...
The latitudinal gradient of cosmic ray protons observed by Ulysses during September 1994 to July 1995 is small, and it increases as function rigidity up ∼ 2 GV then decreases. Although previous drift models could reproduce the small positive for an A > 0 solar polarity cycle, they produced a maximum at well below 1 GV, in contrast observations. After exploring various options, turns out that changing dependence perpendicular diffusion coefficient (DC) polar direction so differs from...
Simultaneous measurements of solar energetic particle (SEP) events by two or more the spacecraft located near 1 AU during rising phase cycle 24 (i.e., STEREO-A, STEREO-B, and near-Earth such as ACE, SOHO, GOES) are used to determine longitudinal dependence 71–112 keV electron, 0.7–3 MeV 15–40 proton, 25–53 proton peak intensities measured in prompt component SEP events. Distributions for selected 35 with identifiable origin approximated form exp [ − (ϕ ϕ0)2/2σ2], where ϕ is separation...
Context. In February 2011, the two STEREO spacecrafts reached a separation of 180 degrees in longitude, offering complete view Sun for first time ever. When full surface is visible, source active regions solar energetic particle (SEP) events can be identified unambiguously. STEREO, combination with near-Earth observatories such as ACE or SOHO, provides three well separated viewpoints, which build an unprecedented platform from to investigate longitudinal variations SEP events.
Abstract. Monitoring soil moisture is still a challenge: it varies strongly in space and time at various scales while conventional sensors typically suffer from small spatial support. With sensor footprint up to several hectares, cosmic-ray neutron sensing (CRNS) modern technology address that challenge. So far, the CRNS method has been applied with single or sparse national-scale networks. This study presents, for first time, dense network of 24 stations covered, May July 2019, an area just...
We report the observation of new properties primary iron (Fe) cosmic rays in rigidity range 2.65 GV to 3.0 TV with 0.62×106 nuclei collected by Alpha Magnetic Spectrometer experiment on International Space Station. Above 80.5 dependence ray Fe flux is identical He, C, and O fluxes, Fe/O ratio being constant at 0.155±0.006. This shows that unexpectedly belong same class which different from Ne, Mg, Si class.Received 2 October 2020Revised 22 November 2020Accepted 9 December...
We report the observation of new properties primary cosmic rays, neon (Ne), magnesium (Mg), and silicon (Si), measured in rigidity range 2.15 GV to 3.0 TV with 1.8×10^{6} Ne, 2.2×10^{6} Mg, 1.6×10^{6} Si nuclei collected by Alpha Magnetic Spectrometer experiment on International Space Station. The Ne Mg spectra have identical dependence above 3.65 GV. three 86.5 GV, deviate from a single power law 200 harden an way. Unexpectedly, rays is different He, C, O. This shows that O are two classes rays.
Solar Energetic Particle (SEP) events are interesting from a scientific perspective as they the product of broad set physical processes corona out through extent heliosphere, and provide insight into particle acceleration transport that widely applicable in astrophysics. From operations perspective, SEP pose radiation hazard for aviation, electronics space, human space exploration, particular missions outside Earth's protective magnetosphere including to Moon Mars. Thus, it is critical...
We present the precision measurement of daily proton fluxes in cosmic rays from May 20, 2011 to October 29, 2019 (a total 2824 days or 114 Bartels rotations) rigidity interval 1 100 GV based on 5.5×10^{9} protons collected with Alpha Magnetic Spectrometer aboard International Space Station. The exhibit variations multiple timescales. From 2014 2018, we observed recurrent flux a period 27 days. Shorter periods 9 and 13.5 are 2016. strength all three periodicities changes time rigidity....
Cosmogenic Isotopes are produced in the Earth's atmosphere due to interaction of galactic cosmic rays with nuclei atmospheric atoms. Among others, 10 Be concentration ice cores depends on ray flux outside magnetosphere and provides therefore a unique tool investigate solar modulation over very long time periods. In this study we importance different local interstellar proton spectra often used literature obtained magnetosphere. order parameterize heliospheric apply force‐field solution using...
SEPServer is a three-year collaborative project funded by the seventh framework programme (FP7-SPACE) of European Union. The objective to provide access state-of-the-art observations and analysis tools for scientific community on solar energetic particle (SEP) events related electromagnetic (EM) emissions. will eventually lead better understanding acceleration transport processes at Sun in inner heliosphere. These SEP that form one key elements space weather. In this paper we present first...
Late on 2011 November 3, STEREO-A, STEREO-B, MESSENGER, and near-Earth spacecraft observed an energetic particle flux enhancement. Based the analysis of in situ plasma observations, their correlation with remote sensing interplanetary transport model, we conclude that increases at multiple locations had a common single-source active region particles filled very broad around Sun. The was located solar backside (as seen from Earth) source large flare, fast wide coronal mass ejection, EIT wave,...
Abstract With Voyager1 crossing the outer boundary of our solar system at end 2012, for first time in instrumental era an unmodulated local interstellar spectrum (LIS) galactic particle energies below ~500 MeV has been measured. On basis these as well Payload Antimatter Matter Exploration and Light‐nuclei Astrophysics (PAMELA) Alpha Magnetic Spectrometer (AMS02) measurements, most recently, three new LIS models have proposed literature. In this study we compare newest to previously often...
Abstract On 10 September 2017, solar energetic particles originating from the active region 12673 produced a ground level enhancement at Earth. The on surface of Mars, 160 longitudinally east Earth, observed by Radiation Assessment Detector (RAD) was largest since landing Curiosity rover in August 2012. Based multipoint coronagraph images and Graduated Cylindrical Shell model, we identify initial 3‐D kinematics an extremely fast coronal mass ejection (CME) its shock front, as well another...
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....
We present the precision measurement of 2824 daily helium fluxes in cosmic rays from May 20, 2011 to October 29, 2019 rigidity interval 1.71 100 GV based on 7.6×10^{8} nuclei collected with Alpha Magnetic Spectrometer (AMS) aboard International Space Station. The flux and proton ratio exhibit variations multiple timescales. In nearly all time intervals 2014 2018, we observed recurrent a period 27 days. Shorter periods 9 days 13.5 are 2016. strength three periodicities changes rigidity....
We present the precision measurements of 11 years daily cosmic electron fluxes in rigidity interval from 1.00 to 41.9 GV based on 2.0×10^{8} electrons collected with Alpha Magnetic Spectrometer (AMS) aboard International Space Station. The exhibit variations multiple timescales. Recurrent flux periods 27 days, 13.5 and 9 days are observed. find that show distinctly different time proton fluxes. Remarkably, a hysteresis between is observed significance greater than 6σ at rigidities below 8.5...
Precision measurements by the Alpha Magnetic Spectrometer (AMS) on International Space Station of deuteron (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>D</a:mi></a:mrow></a:math>) flux are presented. The based <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mrow><c:mn>21</c:mn><c:mo>×</c:mo><c:msup><c:mrow><c:mn>10</c:mn></c:mrow><c:mrow><c:mn>6</c:mn></c:mrow></c:msup></c:mrow></c:math> <e:math...