M. Siluszyk, K. Iskra, W. Wozniak, R. Modzelewska, M. Alania
{"title":"Features of the Cosmic Ray Anisotropy in the Minima for # 23 - 25 Solar Cycles","authors":"M. Siluszyk, K. Iskra, W. Wozniak, R. Modzelewska, M. Alania","doi":"10.22323/1.358.1085","DOIUrl":"https://doi.org/10.22323/1.358.1085","url":null,"abstract":"the analysis of the GCR anisotropy using the median rigidity Rm of NM response (e.g., Ahluwalia et al. 2015) and the effective rigidity Ref characteristic for each NM proposed by Gil et al. (2017). Then the radial Ar and tangential Af components are used for characterizing the GCR modulation in the heliosphere. We show that in the solar minimum 23/24 in 2007-2009 when A<0, the drift effect is not visibly evident in the changes of the component, i.e. for this solar minimum drift","PeriodicalId":166008,"journal":{"name":"Proceedings of 36th International Cosmic Ray Conference — PoS(ICRC2019)","volume":"54 22","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120819285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"How do Cosmic Rays enter and leave the Heliosphere?","authors":"J. Kota","doi":"10.22323/1.358.1098","DOIUrl":"https://doi.org/10.22323/1.358.1098","url":null,"abstract":"The surprisingly abrupt increase of GCRs at the heliopause (HP) seen by both Voyager spacecraft poses a challenge to conventional diffusion models and raises the question how do galactic and anomalous cosmic rays (GCRs and ACRs) enter or leave the heliosphere. In this speculative work we address the possibility that heliospheric currents sheets (HCSs) can provide channels of fat transport to and from the HP. By virtue of fast particle drifts along the HCS, cosmic rays find an easier access to and from the heliosphere at places where a HCS reaches the HP. Numerical simulations using simple toy models will be presented and discussed at the Conference. The possible dynamical role of these cracks will be also considered. We suggest that this mechanism could be responsible, in part, for the apparent imbalance between the total pressures inside and outside the HP, and could perhaps contribute to the flatter than expected size of the inner heliosheath between the termination shock(TS) and HP.","PeriodicalId":166008,"journal":{"name":"Proceedings of 36th International Cosmic Ray Conference — PoS(ICRC2019)","volume":"263 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129147590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Symmetrizing the signal distribution of radio emission from inclined air showers","authors":"T. Huege, F. Schlueter, Lukas Brenk","doi":"10.22323/1.358.0294","DOIUrl":"https://doi.org/10.22323/1.358.0294","url":null,"abstract":"Radio detection of inclined air showers currently receives special attention. It can be performed with very sparse antenna arrays and yields a pure measurement of the electromagnetic air-shower component, thus delivering information that is highly complementary to the measurement of the muonic component using particle detectors. However, radio-based reconstruction of inclined air showers is challenging in light of asymmetries induced in the radio-signal distribution by early-late effects as well as the superposition of geomagnetic and charge-excess radiation. We present a model for the signal distribution of radio emission from inclined air showers which allows explicit compensation of these asymmetries. In a first step, geometrical early-late asymmetries are removed. Secondly, a universal parameterization of the charge-excess fraction as a function of the air-shower geometry, the atmospheric density profile and the lateral distance from the shower axis is used to compensate for the charge-excess contribution to the signal. The resulting signal distribution of the pure geomagnetic emission is then fit with a rotationally symmetric lateral distribution function, the area integration of which yields the radiation energy as an estimator for the cosmic-ray energy. We present the details and performance of our model, which lays the foundation for robust and precise reconstruction of inclined air showers from radio measurements.","PeriodicalId":166008,"journal":{"name":"Proceedings of 36th International Cosmic Ray Conference — PoS(ICRC2019)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131755489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Studying the Temporal Variation of the Cosmic-Ray Sun Shadow Using IceCube Data","authors":"F. Tenholt, J. Tjus, P. Desiati","doi":"10.22323/1.358.0437","DOIUrl":"https://doi.org/10.22323/1.358.0437","url":null,"abstract":"The shadowing effect of the Moon and Sun in TeV cosmic rays has been measured with high statistical significance by several experiments. Unlike particles from directions close to the Moon, however, charged particles passing by the neighborhood of the Sun are affected not only by the geomagnetic but also by the solar near- and interplanetary-magnetic field. Since the latter undergoes a well-known 11-year cycle - during which it can become highly disordered - the cosmic-ray shadow cast by the Sun as observed on Earth is expected to change over time. We present an update of the analysis of the cosmic-ray Moon and Sun shadows using data taken with the IceCube Neutrino Observatory. With a median energy after quality cuts of approximately $50-60, mathrm{TeV}$, depending on the cosmic-ray flux model used, primary cosmic rays inducing events which pass IceCube's Sun shadow filter have a comparatively high energy. While the results for the Moon shadow confirm the stability of the IceCube observatory, the results for the Sun shadow exhibit a clear variation correlating with solar activity and theoretical models of the solar magnetic field.","PeriodicalId":166008,"journal":{"name":"Proceedings of 36th International Cosmic Ray Conference — PoS(ICRC2019)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133501826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Lundquist, Y. Amare, D. Angelaszek, N. Anthony, G. Choi, M. Chung, M. Copley, L. Derome, L. Eraud, C. Falana, A. Gerrety, L. Hagenau, J. Han, H. Huh, Y. Hwang, H. Hyun, H. Jeon, J. Jeon, S. Jeong, S. Kang, H. J. Kim, K. C. Kim, M. H. Kim, H. Y. Lee, J. Lee, M. H. Lee, C. Lamb, J. Liang, L. Lu, L. Lutz, B. Mark, A. Mechaca-Rocha, T. Mernik, M. Nester, O. Ofoha, H. Park, I. H. Park, Jong Moon Park, N. Picot-Clemente, S. Rostsky, E. Seo, J. R. Smith, R. Takeishi, T. Tatoli, P. Walpole, R. Weinmann, J. Wu, Z. Yin, Y. Yoon, H. Zhang
{"title":"Track Reconstruction for ISS-CREAM Resulting in Improved Energy and Charge Resolutions","authors":"J. Lundquist, Y. Amare, D. Angelaszek, N. Anthony, G. Choi, M. Chung, M. Copley, L. Derome, L. Eraud, C. Falana, A. Gerrety, L. Hagenau, J. Han, H. Huh, Y. Hwang, H. Hyun, H. Jeon, J. Jeon, S. Jeong, S. Kang, H. J. Kim, K. C. Kim, M. H. Kim, H. Y. Lee, J. Lee, M. H. Lee, C. Lamb, J. Liang, L. Lu, L. Lutz, B. Mark, A. Mechaca-Rocha, T. Mernik, M. Nester, O. Ofoha, H. Park, I. H. Park, Jong Moon Park, N. Picot-Clemente, S. Rostsky, E. Seo, J. R. Smith, R. Takeishi, T. Tatoli, P. Walpole, R. Weinmann, J. Wu, Z. Yin, Y. Yoon, H. Zhang","doi":"10.22323/1.358.0099","DOIUrl":"https://doi.org/10.22323/1.358.0099","url":null,"abstract":"Cosmic Ray Energetics And Mass for the International Space Station (ISS-CREAM) has taken 1.5 years of direct measurements of high-energy cosmic ray (HECR) particles for energies from 10$^{12}$ to 10$^{15}$ eV. HECR particle identification is significantly improved by tracking particle-detector interactions from the calorimeter (CAL) back to the Silicon Charge Detector (SCD) for charge determination. A track finding algorithm resistant to such issues as particle multiplicity, backscatter, and electronic noise will be outlined. Also, shown is the energy resolution improvement, and the resulting all particle spectrum, provided by ensuring good particle tracks. This allows ISS-CREAM to investigate how the energy distributions evolve, for protons all the way to iron nuclei, and will provide important information for models of galactic sources and HECR propagation.","PeriodicalId":166008,"journal":{"name":"Proceedings of 36th International Cosmic Ray Conference — PoS(ICRC2019)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123010351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Recent Results of the VERITAS Galactic ScienceProgram","authors":"G. Richards","doi":"10.22323/1.358.0773","DOIUrl":"https://doi.org/10.22323/1.358.0773","url":null,"abstract":"VERITAS (Very Energetic Radiation Imaging Telescope Array System) is one of the most sensitive currently operating arrays of imaging atmospheric Cherenkov telescopes, which detect very high-energy (VHE; E > 100 GeV) gamma rays. VERITAS is currently in its 11th year of full-array operations with four 12m-diameter telescopes. Many Galactic sources of VHE gamma rays have been detected by VERITAS, such as pulsar wind nebulae, binary systems, and supernova remnants, and the study of VHE emission from these objects has enabled a deeper understanding of the underlying physical processes responsible for the observed gamma rays. Recent highlights from the VERITAS Galactic science program will be presented, including results on pulsar searches, follow-up of sources detected by HAWC, and the 50-year-period binary PSR J2032+4127.","PeriodicalId":166008,"journal":{"name":"Proceedings of 36th International Cosmic Ray Conference — PoS(ICRC2019)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121925203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Iovine, Juan Antonio Aguilar S'anchez, S. Baur, S. Gozzini, Juan de Dios Zornoza G'omez
{"title":"Combined Search for Neutrinos from Dark Matter Annihilation in the Galactic Centre using ANTARES and IceCube","authors":"N. Iovine, Juan Antonio Aguilar S'anchez, S. Baur, S. Gozzini, Juan de Dios Zornoza G'omez","doi":"10.22323/1.358.0522","DOIUrl":"https://doi.org/10.22323/1.358.0522","url":null,"abstract":"The ANTARES and IceCube neutrino telescopes have both searched for neutrinos from dark matter annihilation in the Galactic Centre, putting limits on the thermally-averaged dark matter self-annihilation cross section $langle sigma_A upsilon rangle$. For WIMP masses above 100 GeV, the most stringent limits were obtained by the ANTARES neutrino telescope, while for lower masses, limits achieved by IceCube are more competitive. The limits obtained by the two detectors are of comparable order of magnitude for WIMP masses going from 50 to 1000 GeV, making this mass range particularly interesting for a combined analysis. In this contribution, we present the limits of the first combined search for dark matter self-annihilation in the centre of the Milky Way using ANTARES and IceCube. The model parameters and the likelihood method were unified, thereby providing a benchmark for future dark matter searches conducted by each collaboration. By combining data of both detectors, we obtained improved limits with respect to the original limits published by the two collaborations.","PeriodicalId":166008,"journal":{"name":"Proceedings of 36th International Cosmic Ray Conference — PoS(ICRC2019)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123426959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Galactic Bulge Monitor with Ashra-1 and NTA detectors","authors":"M. Sasaki","doi":"10.22323/1.358.1003","DOIUrl":"https://doi.org/10.22323/1.358.1003","url":null,"abstract":"The Ashra phase-1 (Ashra-1) detector has been developed to efficiently take fine images of air-shower (AS) Cherenkov (CE) and fluorescence (FL) light induced by the Earth-skimming ντ and γ-ray ASs. Based on the Ashra-1 performance, we have planned a new extension, i.e. Neutrino Telescope Array (NTA), an AS imaging ν and γ-ray observation system for Clear Discovery and Identification of Non-thermal Hadronic Processes in the Universe. Four NTA stations are to be deployed on Mauna Loa at 3000-3500 m a.s.l. (NTA Summit Array layout). Using the four stations, NTA can watch the air volume surrounding Mauna Loa including the surface of Mauna Loa, the largest volcano, Hawaii Island and sea around it to efficiently detect CE and FL light from ντ ASs with both short and long decay lengths and γ-ray ASs. From the detailed MC studies, the NTA ντ sensitivity is sufficient to probe Pevatorons, an extension of the IceCube detected astrophysical neutrino flux and predictions of the cosmogenic neutrino flux. The point-back accuracy is evaluated to be within 0.2 degrees with respect to the original direction of the PeV-scale ES ντ ’s. As the first step observation with the minimal systematic deployment, we propose to monitor 10 TeV-10PeV γ-rays from the Galactic bulge with Ashra-1 as well as Earth-skimming ντ ’s with NTA simultaneously to clearly identify the Pevatrons and comprehensively understand the emission process there. The effective detection area of Ashra-1 and NTA for the Galactic bulge γ-rays with the energies around 1 PeV is more than 10 and 100 times respectively larger than that of a ground array with 500m scale.","PeriodicalId":166008,"journal":{"name":"Proceedings of 36th International Cosmic Ray Conference — PoS(ICRC2019)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128740205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Performance optimization of air shower simulations with CORSIKA","authors":"D. Baack","doi":"10.22323/1.358.0181","DOIUrl":"https://doi.org/10.22323/1.358.0181","url":null,"abstract":"With the steady increase in accuracy, size and complexity of astroparticle physics experiments the need for an extensive amount of high precision Monte Carlo simulations is rapidly growing. Contrary to the increasing demand is the demise of ``Moore's law'' which leads to situations where the system structure of high-performance computing is fundamentally changing and large amounts of money are invested in new infrastructure. In the field of astroparticle physics CORSIKA 7 is currently the most commonly used simulation program, therefore the presented work is focused on this software. All methods provided are also currently transferred to the new CORSIKA 8 framework which will replace CORSIKA 7 in the near future. Due to various constraints on hardware, geometry and physics no experiment is able to observe the full air shower particle cascade developing in the atmosphere. The removal of the non-visible phase space of the cascade at an early stage of the simulation has immense potential to reduce the expense of calculations without changing the results of the simulation for the experiment. Fast machine learning models allow the identification and removal of particles from those regions to speed up the simulations. This works for example for neutrinos by orders of magnitude. First results are shown to demonstrate this technique. \u0000 \u0000Furthermore, when showers are simulated with the IACT configuration around 75% of the time is spent on the Cherenkov photon creation and propagation. We also show results from parallelizing this part of the simulation on GPUs and CPUs with OpenCL.","PeriodicalId":166008,"journal":{"name":"Proceedings of 36th International Cosmic Ray Conference — PoS(ICRC2019)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132858399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Spir-Jacob, A. Djannati-Atai, L. Mohrmann, G. Giavitto, B. Kh'elifi, B. Rudak, C. Venter, R. Zanin
{"title":"Detection of sub-100 GeV$gamma$-ray pulsations fromPSR B1706−44 with H.E.S.S.","authors":"M. Spir-Jacob, A. Djannati-Atai, L. Mohrmann, G. Giavitto, B. Kh'elifi, B. Rudak, C. Venter, R. Zanin","doi":"10.22323/1.358.0799","DOIUrl":"https://doi.org/10.22323/1.358.0799","url":null,"abstract":"We report on the detection of pulsations from PSR B1706-44 based on 28.3 hours of observations with the H.E.S.S. II array with CT5 in monoscopic mode. The lightcurve is similar to that obtained with the Fermi-LAT above 15 GeV and the pulsations exhibit a steep spectrum with index ~ -3.8 in the sub 20 GeV to sub-100 GeV energy range. While a significant signal of ~ 1000 events is detected at energies ~ 70 GeV, it is not possible to either confirm or rule out a power-law behaviour of PSR B1706-44 spectrum in this range.","PeriodicalId":166008,"journal":{"name":"Proceedings of 36th International Cosmic Ray Conference — PoS(ICRC2019)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122304002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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