A. Kuhlman
A5050207353- Solar and Space Plasma Dynamics
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Ionosphere and magnetosphere dynamics
- Atmospheric Ozone and Climate
- Particle Accelerators and Free-Electron Lasers
- Radiation Therapy and Dosimetry
- Astro and Planetary Science
- Solar Radiation and Photovoltaics
- Neutrino Physics Research
- Cognitive and developmental aspects of mathematical skills
- Geomagnetism and Paleomagnetism Studies
- Quantum Electrodynamics and Casimir Effect
- Child and Animal Learning Development
- Atomic and Molecular Physics
- Nuclear physics research studies
- Visual and Cognitive Learning Processes
- Medical Imaging Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Risk Management in Financial Firms
- Musicians’ Health and Performance
University of Hawaii System
2020-2025
University of Hawaiʻi at Mānoa
2019-2023
Brandeis University
2006
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...
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 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....
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 report the properties of precision time structures cosmic nuclei He, Li, Be, B, C, N, and O fluxes over an 11-year solar cycle from May 2011 to November 2022 in rigidity range 1.92 60.3 GV. The show similar but not identical variations with amplitudes decreasing increasing rigidity. In particular, below 3.64 GV B fluxes, 2.15 are significantly less affected by modulation than He flux. observe that these differences linearly correlated spectral indices fluxes. This shows, a...
Precise knowledge of the charge and rigidity dependence secondary cosmic ray fluxes secondary-to-primary flux ratios is essential in understanding propagation. We report properties heavy fluorine F R range 2.15 GV to 2.9 TV based on 0.29 million events collected by Alpha Magnetic Spectrometer experiment International Space Station. The spectrum deviates from a single power law above 200 GV. heavier F/Si ratio distinctly different lighter B/O (or B/C) dependence. In particular, 10 GV, F/SiB/O...
We report the properties of sodium (Na) and aluminum (Al) cosmic rays in rigidity range 2.15 GV to 3.0 TV based on 0.46 million 0.51 nuclei collected by Alpha Magnetic Spectrometer experiment International Space Station. found that Na Al, together with nitrogen (N), belong a distinct ray group. In this group, we observe that, similar N flux, both flux Al are well described sums primary component (proportional silicon flux) secondary fluorine flux). The fraction increases for N, Na, fluxes...
Abstract A Forbush decrease (FD) is a sudden reduction of Galactic Cosmic Rays (GCRs) that usually caused by intense solar wind transients, such as Interplanetary Coronal Mass Ejections (ICMEs) and Corotating Interaction Regions (CIRs). Using daily proton fluxes measured AMS-02 between 2011 May 2019 October, we identified 142 FD events with an automatic systematic analysis method. The properties 47 FDs ICMEs 54 CIRs were analyzed. We found the rigidity dependence GCR flux generally better...
Abstract Interplanetary coronal mass ejections (ICMEs) are eruptions of plasma that propagate outward through the heliosphere. ICMEs, and shocks they drive, cause a sudden decrease in cosmic-ray flux their local area heliosphere, called Forbush (FD). A method defining FDs is established, an automated process for identifying neutron monitor (NM) data created. The correlation between ICME properties FD magnitude 12 different NMs examined 91 ICME-associated events occurring from 2001 2019...
We describe an interactive, computer-based test inspired by the Trail Making Test (TMT). In this new test, young (mean age = 20.4 years) and older participants 74.9 used natural, pointing responses to order series of numbers, letters, or intermixed letters numbers. This interactive which avoids several deficiencies TMT, assesses participants' baseline speed for detecting responding individual items, captures time each response, segregates erroneous from correct ones. The inter-response times...
Galactic cosmic rays (GCRs) entering the heliosphere are disturbed by magnetic field of Sun, which varies shape and intensity their local interstellar spectrum. The force-field approximation is a popular way dealing with solar modulation, especially for studies focused on galactic transport rays. validity this approach to reproduce modulated GCR fluxes at Earth tested using monthly proton measured PAMELA between July 2006 January 2014 helium AMS-02 May 2011 2017. We show that precision new...
We study the predictions for p/He ratio in galactic cosmic rays according to force-field approximation. The dependence of time variation on local interstellar spectrum (LIS) shape and mass-to-charge ratio, $A/Z$, is analyzed detail. find that, depending rigidity range sign spectral index LIS can be correlated or anti-correlated with phase solar cycle. show that $A/Z$ most probable cause decrease recently observed by AMS-02 after 2015 between 2 3 GV.
Galactic cosmic rays (GCRs) entering the heliosphere are disturbed by magnetic field of Sun, which varies shape and intensity their local interstellar spectrum. The force-field approximation is a popular way dealing with solar modulation, especially for studies focused on galactic transport rays. validity this approach to reproduce modulated GCR fluxes at Earth tested using monthly proton measured PAMELA between July 2006 January 2014 helium AMS-02 May 2011 2017. We show that precision new...
We study the predictions for p/He ratio in galactic cosmic rays according to force-field approximation. The dependence of time variation on local interstellar spectrum (LIS) shape and mass-to-charge ratio, A/Z, is analyzed detail. find that, depending rigidity range sign spectral index LIS can be correlated or anti-correlated with phase solar cycle. show that A/Z most probable cause decrease recently observed by AMS-02 after 2015 between 2 3 GV.