Dr. Bruno has over 15 years of experience in experimental astroparticle physics. His scientific activities focus on the investigation of the origin and the propagation of cosmic rays in the Galaxy, the heliosphere and the terrestrial magnetosphere, by means of ground- and space-based detectors. He's actively involved in the modeling of solar energetic particle events aimed to space-weather predictions, and in the development and calibration of new particle detectors.
Alessandro Bruno
(Research Scientist)
| Email: | alessandro.bruno-1@nasa.gov |
| Phone: | 301.286.7350 |
| Org Code: | 672 |
| Address: |
NASA/GSFC Mail Code 672 Greenbelt, MD 20771 |
| Employer: | CATHOLIC UNIV OF AMERICA |
Brief Bio
Research Interests
Cosmic-ray physics; solar energetic particles; magnetospheric radiation; space weather
Grants
Characterization of solar energetic particles at 1 AU
ROSES Heliophysics Supporting Research - NASA (NNH19ZDA001N-HSR) - Awarded: 2020-06-19
CLEAR: Center for All-Clear SEP Forecast
Space Weather Centers of Excellence - University of Michigan (NNH22ZDA001N-SWXC:B.22) - Awarded: 2023-07-19
Dates: -
CALET: Transforming Astroparticle Physics with Extended Operations and Analysis
Astrophysics Research and Analysis - Louisiana State University (NNH23ZDA001N-APRA:D.3) - Awarded: 2024-06-20
Dates: -
The Influence of Solar Wind Structures on Energetic Particles in the Heliosphere Over a Wide Energy Range
Living With a Star Science - University of Maryland, College Park (NNH19ZDA001N-LWS) - Awarded: 2020-08-04
Dates: -
The Contribution of Atmospheric Precipitation to Radiation Belt Loss: When, Where, and How
Living With a Star Science - University of Colorado, Boulder (NNH20ZDA001N-LWS:B.5) - Awarded: 2021-05-28
Dates: -
gRound and spacE-bAsed analySis of Strong sEp eventS and Study of their terrestrial effects (REASSESS)
International Space Science Institute - University of Oulu, Finland (ISSI-2023) - Awarded: 2023-05-25
Dates: -
Publications
Refereed
2026. "IMAP’s Role in Understanding Particle Injection and Energization Throughout the Heliosphere.", Space Science Reviews, 222 (1): 6 [10.1007/s11214-025-01257-4] [Journal Article/Letter]
2025. "The 2024 July 16 solar event: a challenge to the coronal mass ejection origin of long-duration gamma-ray flares.", Astronomy & Astrophysics, 704 A140 [10.1051/0004-6361/202556879] [Journal Article/Letter]
2025. "Physics-based Simulation of the 2013 April 11 Solar Energetic Particle Event.", The Astrophysical Journal, 985 (1): 82 [10.3847/1538-4357/adc4e3] [Journal Article/Letter]
2025. "Radiation‐Belt Dropouts: Relationship With Geomagnetic Storms and MeV Precipitation.", Geophysical Research Letters, 52 (4): [10.1029/2024gl113660] [Journal Article/Letter]
2024. "MeV Electron Precipitation During Radiation Belt Dropouts.", Journal of Geophysical Research: Space Physics, 129 (8): e2024JA032759 [https://doi.org/10.1029/2024JA032759] [Journal Article/Letter]
2024. "Comparative Observations of the Outer Belt Electron Fluxes and Precipitated Relativistic Electrons.", Geophysical Research Letters, 51 (12): [10.1029/2024gl109673] [Journal Article/Letter]
2024. "Characterization of Relativistic Electron Precipitation Events Observed by the CALET Experiment Using Self‐Organizing‐Maps.", Journal of Geophysical Research: Space Physics, 129 (5): [10.1029/2024ja032481] [Journal Article/Letter]
2024. "The Calorimetric Electron Telescope (CALET) on the International Space Station: Results from the first eight years on orbit.", Advances in Space Research, [10.1016/j.asr.2024.04.035] [Journal Article/Letter]
2024. "Direct measurements of cosmic - ray iron and nickel with CALET on the International Space Station.", Advances in Space Research, [10.1016/j.asr.2024.03.052] [Journal Article/Letter]
2024. "On the Spatial and Temporal Evolution of EMIC Wave‐Driven Relativistic Electron Precipitation: Magnetically Conjugate Observations From the Van Allen Probes and CALET.", Geophysical Research Letters, 51 (5): [10.1029/2023gl107087] [Journal Article/Letter]
2024. "The Lunar OutpOst Neutron Spectrometer (LOONS).", 2022 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 1-5 [10.1109/NSS/MIC44845.2022.10399092] [Proceedings]
2023. "Direct Measurement of the Spectral Structure of Cosmic-Ray Electrons + Positrons in the TeV Region with CALET on the International Space Station.", Physical Review Letters, 131 (19): 191001 [10.1103/physrevlett.131.191001] [Journal Article/Letter]
2023. "Next-generation SOlar Neutron TRACking (SONTRAC) instrument.", Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1054 168352 [10.1016/j.nima.2023.168352] [Journal Article/Letter]
2023. "Statistical Relationship between Long-duration High-energy Gamma-Ray Emission and Solar Energetic Particles.", The Astrophysical Journal, 953 (2): 187 [10.3847/1538-4357/ace24c] [Journal Article/Letter]
2023. "Charge-Sign Dependent Cosmic-Ray Modulation Observed with the Calorimetric Electron Telescope on the International Space Station.", Physical Review Letters, 130 (21): 211001 [10.1103/physrevlett.130.211001] [Journal Article/Letter]
2023. "Direct Measurement of the Cosmic-Ray Helium Spectrum from 40 GeV to 250 TeV with the Calorimetric Electron Telescope on the International Space Station.", Physical Review Letters, 130 (17): 171002 [10.1103/physrevlett.130.171002] [Journal Article/Letter]
2022. "Cosmic-ray boron flux measured from 8.4 GeV/n to 3.8 TeV/n with the Calorimetric Electron Telescope on the International Space Station.", Physical Review Letters, 129 (25): 251103 [10.1103/physrevlett.129.251103] [Journal Article/Letter]
2022. "Interpreting the Observed Positive Correlation between the Event-integrated Fluence and the Rollover Energy of Solar Energetic Particle Events by the PAMELA Mission with Coupled Hydromagnetic Wave Excitation and Proton Acceleration at Shocks in the Low Corona.", The Astrophysical Journal, 936 (1): 91 [10.3847/1538-4357/ac81c2] [Journal Article/Letter]
2022. "Observation of Spectral Structures in the Flux of Cosmic-Ray Protons from 50 GeV to 60 TeV with the Calorimetric Electron Telescope on the International Space Station.", Physical Review Letters, 129 (10): 101102 [10.1103/physrevlett.129.101102] [Journal Article/Letter]
2022. "Review of Solar Energetic Particle Models.", Advances in Space Research, [10.1016/j.asr.2022.08.006] [Journal Article/Letter]
2022. "CALET Search for Electromagnetic Counterparts of Gravitational Waves during the LIGO/Virgo O3 Run.", The Astrophysical Journal, 933 (1): 85 [10.3847/1538-4357/ac6f53] [Journal Article/Letter]
2022. "Modeling the East‐West Asymmetry of Energetic Particle Fluence in Large Solar Energetic Particle Events Using the iPATH Model.", Journal of Geophysical Research: Space Physics, 127 (6): e2022JA030343 [10.1029/2022ja030343] [Journal Article/Letter]
2022. "Direct Measurement of the Nickel Spectrum in Cosmic Rays in the Energy Range from 8.8 GeV/n to 240 GeV/n with CALET on the International Space Station.", Physical Review Letters, 128 (13): 131103 [10.1103/physrevlett.128.131103] [Journal Article/Letter]
2022. "EMIC‐Wave Driven Electron Precipitation observed by CALET on the International Space Station.", Geophysical Research Letters, 49 (6): e2021GL097529 [10.1029/2021gl097529] [Journal Article/Letter]
2022. "Energetic proton back-precipitation onto the solar atmosphere in relation to long-duration gamma-ray flares.", Astronomy & Astrophysics, 658 A23 [10.1051/0004-6361/202142002] [Journal Article/Letter]
2021. "CALET Observations during the First 5 Years on the ISS.", Physics of Atomic Nuclei, 84 (6): 985-994 [10.1134/s1063778821130214] [Journal Article/Letter]
2021. "Estimating the Mean Free Paths of Energetic Protons Using Differential Intensity Spectra.", The Astrophysical Journal, 920 (2): 91 [10.3847/1538-4357/ac167e] [Journal Article/Letter]
2021. "Modeling the 2012 May 17 Solar Energetic Particle Event Using the AWSoM and iPATH Models.", The Astrophysical Journal, 919 (2): 146 [10.3847/1538-4357/ac0db9] [Journal Article/Letter]
2021. "East–West Proton Flux Anisotropy Observed with the PAMELA Mission.", The Astrophysical Journal, 919 (2): 114 [10.3847/1538-4357/ac1677] [Journal Article/Letter]
2021. "Solar-cycle Variations of South Atlantic Anomaly Proton Intensities Measured with the PAMELA Mission.", The Astrophysical Journal Letters, 917 (2): L21 [10.3847/2041-8213/ac1a74] [Journal Article/Letter]
2021. "Measurement of the Iron Spectrum in Cosmic Rays from 10 GeV/n to 2.0 TeV/n with the Calorimetric Electron Telescope on the International Space Station.", Physical Review Letters, 126 (24): 241101 [10.1103/physrevlett.126.241101] [Journal Article/Letter]
2021. "Empirical Model of 10 – 130 MeV Solar Energetic Particle Spectra at 1 AU Based on Coronal Mass Ejection Speed and Direction.", Solar Physics, 296 (2): 36 [10.1007/s11207-021-01779-4] [Journal Article/Letter]
2020. "Direct Measurement of the Cosmic-Ray Carbon and Oxygen Spectra from 10 GeV/n to 2.2 TeV/n with the Calorimetric Electron Telescope on the International Space Station.", Physical Review Letters, 125 (25): 251102 [10.1103/physrevlett.125.251102] [Journal Article/Letter]
2020. "3D propagation of relativistic solar protons through interplanetary space.", Astronomy & Astrophysics, 639 A105 [10.1051/0004-6361/201937338] [Journal Article/Letter]
2020. "Radiation Dose During Relativistic Electron Precipitation Events at the International Space Station.", Space Weather, 18 (7): [10.1029/2019sw002280] [Journal Article/Letter]
2019. "Comparing Long-duration Gamma-Ray Flares and High-energy Solar Energetic Particles.", The Astrophysical Journal, 879 (2): 90 [Full Text] [https://doi.org/10.3847/1538-4357/ab258f] [Journal Article/Letter]
2019. "Direct Measurement of the Cosmic-Ray Proton Spectrum from 50 GeV to 10 TeV with the Calorimetric Electron Telescope on the International Space Station.", Physical Review Letters, 122 (18): 181102 [10.1103/physrevlett.122.181102] [Journal Article/Letter]
2019. "Spectral Analysis of the September 2017 Solar Energetic Particle Events.", Space Weather, [10.1029/2018sw002085] [Journal Article/Letter]
2019. "The CALorimetric Electron Telescope (CALET) on the International Space Station: Results from the First Two Years On Orbit.", Journal of Physics: Conference Series, 1181 012003 [10.1088/1742-6596/1181/1/012003] [Proceedings]
2018. "Solar Energetic Particle Events Observed by the PAMELA Mission.", The Astrophysical Journal, 862 (2): 97 [10.3847/1538-4357/aacc26] [Journal Article/Letter]
2018. "First observations of speed of light tracks by a fluorescence detector looking down on the atmosphere.", Journal of Instrumentation, 13 (05): P05023-P05023 [10.1088/1748-0221/13/05/p05023] [Journal Article/Letter]
2018. "Proton Fluxes Measured by the PAMELA Experiment from the Minimum to the Maximum Solar Activity for Solar Cycle 24.", The Astrophysical Journal, 854 (1): L2 [10.3847/2041-8213/aaa9b2] [Journal Article/Letter]
2018. "Evidence of Energy and Charge Sign Dependence of the Recovery Time for the 2006 December Forbush Event Measured by the PAMELA Experiment.", The Astrophysical Journal, 853 (1): 76 [10.3847/1538-4357/aaa0c8] [Journal Article/Letter]
2018. "Unexpected Cyclic Behavior in Cosmic-Ray Protons Observed by PAMELA at 1 au.", The Astrophysical Journal, 852 (2): L28 [10.3847/2041-8213/aaa403] [Journal Article/Letter]
2017. "Calibration of the GOES 13/15 high-energy proton detectors based on the PAMELA solar energetic particle observations.", Space Weather, 15 (9): 1191-1202 [10.1002/2017sw001672] [Journal Article/Letter]
2017. "Meteor studies in the framework of the JEM-EUSO program.", Planetary and Space Science, 143 245-255 [10.1016/j.pss.2016.12.001] [Journal Article/Letter]
2017. "Cosmic ray oriented performance studies for the JEM-EUSO first level trigger.", Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 866 150-163 [10.1016/j.nima.2017.05.043] [Journal Article/Letter]
2017. "Geomagnetically trapped, albedo and solar energetic particles: trajectory analysis and flux reconstruction with PAMELA.", Advances in Space Research, 60 (4): 788-795 [10.1016/j.asr.2016.06.042] [Journal Article/Letter]
2016. "PAMELA's measurements of geomagnetic cutoff variations during the 14 December 2006 storm.", Space Weather, 14 (3): 210-220 [10.1002/2016sw001364] [Journal Article/Letter]
2016. "MEASUREMENTS OF COSMIC-RAY HYDROGEN AND HELIUM ISOTOPES WITH THEPAMELAEXPERIMENT.", The Astrophysical Journal, 818 (1): 68 [10.3847/0004-637x/818/1/68] [Journal Article/Letter]
2016. "The May 17, 2012 solar event: back-tracing analysis and flux reconstruction with PAMELA.", Journal of Physics: Conference Series, 675 (3): 032006 [10.1088/1742-6596/675/3/032006] [Journal Article/Letter]
2015. "TIME DEPENDENCE OF THEe−FLUX MEASURED BYPAMELADURING THE 2006 JULY–2009 DECEMBER SOLAR MINIMUM.", The Astrophysical Journal, 810 (2): 142 [10.1088/0004-637x/810/2/142] [Journal Article/Letter]
2015. "Reentrant albedo proton fluxes measured by the PAMELA experiment.", Journal of Geophysical Research: Space Physics, 120 (5): 3728-3738 [10.1002/2015ja021019] [Journal Article/Letter]
2015. "PAMELA’S MEASUREMENTS OF MAGNETOSPHERIC EFFECTS ON HIGH-ENERGY SOLAR PARTICLES.", The Astrophysical Journal, 801 (1): L3 [10.1088/2041-8205/801/1/l3] [Journal Article/Letter]
2015. "TRAPPED PROTON FLUXES AT LOW EARTH ORBITS MEASURED BY THEPAMELAEXPERIMENT.", The Astrophysical Journal, 799 (1): L4 [10.1088/2041-8205/799/1/l4] [Journal Article/Letter]
2014. "The PAMELA Mission: Heralding a new era in precision cosmic ray physics.", Physics Reports, 544 (4): 323-370 [10.1016/j.physrep.2014.06.003] [Journal Article/Letter]
2014. "MEASUREMENT OF BORON AND CARBON FLUXES IN COSMIC RAYS WITH THE PAMELA EXPERIMENT.", The Astrophysical Journal, 791 (2): 93 [10.1088/0004-637x/791/2/93] [Journal Article/Letter]
2013. "Cosmic-Ray Positron Energy Spectrum Measured by PAMELA.", Physical Review Letters, 111 (8): 081102 [10.1103/physrevlett.111.081102] [Journal Article/Letter]
2013. "An evaluation of the exposure in nadir observation of the JEM-EUSO mission.", Astroparticle Physics, 44 76-90 [10.1016/j.astropartphys.2013.01.008] [Journal Article/Letter]
2013. "TIME DEPENDENCE OF THE PROTON FLUX MEASURED BY PAMELA DURING THE 2006 JULY-2009 DECEMBER SOLAR MINIMUM.", The Astrophysical Journal, 765 (2): 91 [10.1088/0004-637x/765/2/91] [Journal Article/Letter]
2013. "Measurement of the flux of primary cosmic ray antiprotons with energies of 60 MeV to 350 GeV in the PAMELA experiment.", JETP Letters, 96 (10): 621-627 [10.1134/s002136401222002x] [Journal Article/Letter]
2011. "OBSERVATIONS OF THE 2006 DECEMBER 13 AND 14 SOLAR PARTICLE EVENTS IN THE 80 MeV n–1-3 GeV n–1RANGE FROM SPACE WITH THE PAMELA DETECTOR.", The Astrophysical Journal, 742 (2): 102 [10.1088/0004-637x/742/2/102] [Journal Article/Letter]
2011. "THE DISCOVERY OF GEOMAGNETICALLY TRAPPED COSMIC-RAY ANTIPROTONS.", The Astrophysical Journal, 737 (2): L29 [10.1088/2041-8205/737/2/l29] [Journal Article/Letter]
2011. "Cosmic-Ray Electron Flux Measured by the PAMELA Experiment between 1 and 625 GeV.", Physical Review Letters, 106 (20): 201101 [10.1103/physrevlett.106.201101] [Journal Article/Letter]
2011. "PAMELA Measurements of Cosmic-Ray Proton and Helium Spectra.", Science, 332 (6025): 69-72 [10.1126/science.1199172] [Journal Article/Letter]
2010. "PAMELA Results on the Cosmic-Ray Antiproton Flux from 60 MeV to 180 GeV in Kinetic Energy.", Physical Review Letters, 105 (12): 121101 [10.1103/physrevlett.105.121101] [Journal Article/Letter]
2009. "An anomalous positron abundance in cosmic rays with energies 1.5–100 GeV.", Nature, 458 (7238): 607-609 [10.1038/nature07942] [Journal Article/Letter]
2009. "New Measurement of the Antiproton-to-Proton Flux Ratio up to 100 GeV in the Cosmic Radiation.", Physical Review Letters, 102 (5): 051101 [10.1103/physrevlett.102.051101] [Journal Article/Letter]