Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session B15: Cosmic Ray SIG MinisymposiumFocus Mini-Symposium
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Sponsoring Units: DAP Chair: Marcos Santander, University of Alabama Room: Sheraton Plaza Court 4 |
Saturday, April 13, 2019 10:45AM - 11:21AM |
B15.00001: Direct Cosmic Ray Measurements: Status and Perspectives Invited Speaker: Stephane Coutu The recent years saw the implementation and deployment of a new generation of instruments flown in space or on stratospheric balloons. They are targeted at the study of a variety of energetic cosmic particles, including protons and nuclei, electrons, antimatter particles (positrons and antiprotons), secondary nuclei (including isotopes), ultraheavy nuclei, all complementing gamma-ray studies. Thus a new wealth of data is providing fresh insights on high-energy phenomena in the Galaxy. The instruments are large and deployed for long exposures, providing for an energy reach that permits direct cross-comparisons with ground-based measurements. We will review the state of the field, focusing on present and near future efforts. |
Saturday, April 13, 2019 11:21AM - 11:33AM |
B15.00002: The CALorimetric Electron Telescope (CALET) Status and Initial Results T Gregory Guzik The CALET space experiment, that was developed by collaborators in Japan, Italy and the United States, has been mounted as an attached payload on the International Space Station (ISS) Japanese Experiment Module – Exposed Facility (JEM-EF) since August 2015. Over the >1,000 days of data taking the instrument has accumulated more than ~630 million triggered events > 10 GeV with a live time fraction of 84%. These data have been used to study electrons to ~5 TeV, gamma rays above 10 GeV and nuclei with Z=1 to 40 up to 1,000 TeV. Multiple peer-reviewed journal publications detailing the CALET results are now available. The instrument consists of a particle charge identification module, a thin imaging calorimeter (3 r.l. in total) with tungsten plates interleaving scintillating fiber planes, and a thick calorimeter (27 r.l.) composed of lead tungstate logs. CALET has the depth, imaging capabilities and energy resolution for excellent separation between hadrons, electrons and gamma rays. This presentation summarizes the instrument design, on-orbit performance, and provides highlights of the most important CALET results over the last three years. |
Saturday, April 13, 2019 11:33AM - 11:45AM |
B15.00003: All-Sky Anisotropy of Cosmic Rays at 10 TeV Juan Carlos Diaz Velez, Paolo Desiati We discuss results of the joint analysis of the arrival direction distribution of Galactic cosmic rays by the High-Altitude Water Cherenkov and IceCube Neutrino observatories at the same median primary particle energy of 10 TeV. The combined sky map and angular power spectrum largely eliminate biases that result from partial sky coverage and holds a key to probe into the propagation properties of TeV cosmic rays through our local interstellar medium and the interaction between the interstellar and heliospheric magnetic fields. We also infer the direction of the interstellar magnetic field from the boundary between large scale excess and deficit regions from which we estimate the missing corresponding vertical dipole component of the large scale anisotropy. |
Saturday, April 13, 2019 11:45AM - 11:57AM |
B15.00004: Recent Results from the Fourth Flight of the ANITA Experiment Andrew Ludwig The ANtarctic Impulsive Transient Antenna (ANITA), a NASA Long-Duration Balloon payload, completed its fourth flight in December 2016, after 28 days of flight time. ANITA searches for Askaryan emission from interactions of ultra-high-energy (>~10^18 eV) neutrinos in Antarctic ice. ANITA is also sensitive to geomagnetic radio emission from extensive air showers. I will present recently released results from the fourth flight of ANITA, which include the strongest constraints on the diffuse neutrino flux at energies above 10^~19.5 eV and the detection of tens of extensive air shower events. |
Saturday, April 13, 2019 11:57AM - 12:33PM |
B15.00005: Open Business and Discussion Marcos Santander The Cosmic-Ray SIG will address open business topics and discuss them with the community. Please refer to the Physics of the Cosmos page for additional details (https://pcos.gsfc.nasa.gov/physpag/meetings/APS_2019/APS2019-agenda.php#crsig) |
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