A5021150702- Solar and Space Plasma Dynamics
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Ionosphere and magnetosphere dynamics
- Solar Radiation and Photovoltaics
- Atmospheric Ozone and Climate
- Particle physics theoretical and experimental studies
- Astro and Planetary Science
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Geomagnetism and Paleomagnetism Studies
- Plasma Applications and Diagnostics
- Plasma Diagnostics and Applications
- Nuclear physics research studies
- Radiation Therapy and Dosimetry
- Laser-induced spectroscopy and plasma
- High-Energy Particle Collisions Research
- Atomic and Molecular Physics
University of Hawaiʻi at Mānoa
2019-2023
University of Hawaii System
2017-2023
Goddard Space Flight Center
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Milano Bicocca
2020
Abstract Galactic cosmic rays (GCRs) are affected by solar modulation while they propagate through the heliosphere. The study of time variation GCR spectra observed at Earth can shed light on underlying physical processes, specifically diffusion and particle drifts. Recently, AMS-02 experiment measured with very high accuracy cosmic-ray proton helium flux between 2011 May 2017 in rigidity range from 1 to 60 GV. In this work, a comprehensive three-dimensional steady-state numerical model is...
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...
Whitepaper #236 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research; infrastructure/workforce/other programmatic. Additional fundamental space plasma theory; state of profession; laboratory […]
Whitepaper #099 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research; infrastructure/workforce/other programmatic. Additional ground-based missions/projects; laboratory space plasma physics; research tools […]
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 consider scenarios in which dark matter is a Majorana fermion couples to Standard Model fermions through the exchange of charged mediating particles. The matrix elements for various annihilation processes are then related one-loop corrections fermion-photon vertex, where and mediators run loop. In particular, limit helicity mixing suppressed, cross section final states charge form factor. These can be extracted gauge-invariant manner from collider sections. Although current measurements...
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.