World Library  


 
  • Cover Image

Modelling the Steady State Spectral Energy Distribution of the Bl-...

By: M. Rüger; F. Spanier; M. Weidinger

Description: Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany. In this paper we present a fully selfconsistent SSC model with particle acceleration due to shock and stochastic acceleration (Fermi-I and Fermi-II-Processes respectively) to model the quiescent spectral energy distribution (SED) observed from PKS 2155. The simultaneous August/September 2008 multiwavelength data of H.E.S.S., Fermi, RXTE/SWIFT and ATOM...

Kardashev, N. S.: Nonstationariness of spectra of young sources of nonthermal radio emission, Soviet Astronomy - AJ, 39, 393–409, 1962.; Aharonian et al.: Multi-wavelength observations of PKS 2155-304 with HESS, 442, 895–907, doi:10.1051/0004-6361:20053353, 2005.; Bednarz, J. and Ostrowski, M.: The acceleration time-scale for first-order Fermi acceleration in relativistic shock waves, 283, 447–456, 1996.; Blumentha...

Read More
  • Cover Image

A Simple Model for Reflection-driven Spectral Evolution of Turbule...

By: T. Laitinen

Description: Välsälä Institute in Space Physics and Astronomy, University of Turku, Finland. Dissipation of turbulence is generally considered as a prime candidate for the heating and acceleration of solar wind from the corona throughout the heliosphere, due to radially evolving dissipation processes and/or cascading of energy to dissipation scales. In order to model the latter consistently, we must consider the evolution of cross-helicity when modeling the strength of t...

Read More
  • Cover Image

Energetic Neutral Atom Fluxes from the Heliosheath Varying with th...

By: H.-j. Fahr; K. Scherer

Description: Institut für Astrophysik und Extraterrestrische Forschung der Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany. Energetic neutral atoms (ENA's) which are produced in the heliospheric interface can be used to remotely investigate this highly interesting, but poorly known region acting as buffer against the interstellar plasma. To optimally take advantage from this very promising observational technique, based on ENA flux measurements, one needs to kn...

Read More
  • Cover Image

Cosmic Ray Composition Studies Through the Gerasimova-zatsepin Eff...

By: K. Okei; H. Matsumoto; N. Ochi; N. Ohmori; A. Iyono; T. Nakatsuka; I. Yamamoto; T. Konishi; S. Ohara; K. Saitoh; S. Tsuji; N. Takahashi; T. Nakamura

Description: Dept. of Fundamental Science, Okayama University of Science, Okayama 700-0005, Japan. Extensive air showers (EASs) originated from primary cosmic ray energies above 1015 eV have been measured at multiple EAS observatories deployed in Japan since Sept. 1996. The typical EAS array has been located at the rooftop of the buildings in the university campus, and has GPS-disciplined 10 MHz oscillator to provide the UTC time stamp for each EAS event ...

Zatsepin, G. T.: On the photodisintegration of heavy cosmic-ray particles by solar radiation, Dokl. Akad. Nauk. SSSR, 80, 577–578, 1951.; Gerasimova, N. M. and Zatsepin, G. T.: Splitting of cosmic ray nuclei by solar photons, ZhETF, 38, 1245–1252, 1960.; Medina-Tanco, G. and Watson, A.: The photodisintegration of cosmic ray nuclei by solar photons: the Gerasimova-Zatsepin effect revisited, Astropart. Phys., 10, 157–164, 1999.; Epele, L., Mollerach, S., and Roulet, E.: On...

Read More
  • Cover Image

A Heliospheric Hybrid Model: Hydrodynamic Plasma Flow and Kinetic ...

By: S. E. S. Ferreira; K. Scherer

Description: Institut für Astrophysik und Extraterrestrische Forschung der Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany. In this paper we present a new five particle species hybrid model for calculating cosmic ray particle transport and acceleration in a dynamic heliospheric environment. In particular the effects of solar cycle related changes in the solar wind speed on the heliospheric geometry, solar wind flow and cosmic ray distribution are discussed, whe...

Read More
  • Cover Image

The Balloon-the-shower Programme of the Pierre Auger Observatory :...

By: B. Keilhauer for the Pierre Auger Collaboration

Description: KIT - Karlsruhe Institute of Technology, Germany. The southern part of the Pierre Auger Observatory in Argentina investigates cosmic rays with energies above about 5·1017 eV. High-energy events which have been recorded with both detector components, surface water Cherenkov tanks and fluorescence telescopes, are crucial for the energy calibration of the entire detector system. Using this method, the energy reconstruction of extensive air shower...

Abraham, J. et al. (Pierre Auger Collab.): Properties and performance of the prototype instrument for the Pierre Auger Observatory, Nucl. Instr. Meth., A 523, 50–95, 2004.; Abraham, J. et al. (Pierre Auger Collab.): The Cosmic Ray Energy Spectrum and Related Measurements with the Pierre Auger Observatory, in: Proc. 31$^\rmst$ ICRC, Lodz, Poland, arXiv:0906.2189[astro-ph], 2009.; Abraham, J. et al. (Pierre Auger Collab.): The fluorescence detector of the Pierre Auger Obse...

Read More
  • Cover Image

Observations of Anomalous Transport of Energetic Electrons in the ...

By: S. Perri; G. Zimbardo

Description: Department of Physics, University of Calabria, Ponte P. Bucci, Cubo 31C, 87036, Arcavacata di Rende, Italy. We study the propagation of energetic particles, accelerated by interplanetary shock waves, upstream of the shock, considering the possibility of having anomalous transport. The theoretical treatment of the anomalous transport is developed via the propagator formalism, considering that in the case of a superdiffusive transport the propagator has pow...

Bell, A. R.: The acceleration of cosmic rays in shock fronts.I, Mont. Not. R. Astr. Soc., 182, 147–156, 1978.; Blandford, R. D. and Ostriker, J. P.: Particle acceleration by astrophysical shocks, Astrophys. J. Lett., 221, L29, 1978.; Fisk, L. A. and Lee, M. A.: Shock acceleration of energetic particles in corotating interaction regions in the solar wind, Astrophys. J., 237, 620–626, 1980.; Giacalone, J. and Jokipii, J. R.: The transport of cosmic rays across a turbulent ...

Read More
  • Cover Image

27-day Variations of the Galactic Cosmic Ray Intensity and Anisotr...

By: R. Modzelewska; A. Gil; M. V. Alania

Description: Institute of Math. And Physics of University of Podlasie, 3 Maja 54, 08-110 Siedlce, Poland. We study the 27-day variations of the galactic cosmic ray (GCR) intensity and three dimensional (3-D) anisotropy in different polarity periods of the solar magnetic cycle. We found that the larger amplitudes of the 27-day variations of the galactic cosmic ray anisotropy and intensity in the minimum epochs of solar activity for the A>0 polarity period than...

Wawrzynczak,~A. and Alania,~M V.: Peculiarities of galactic cosmic ray Forbush effects during October November 2003, Adv. in Space Res., 35, 682–686, 2005.; Wawrzynczak,~A. and Alania,~M V.: Modeling of the recurrent Forbush effect of the galactic cosmic ray intensity and comparison with the experimental data, Adv. in Space Res., 41, 1, 325–334, 2008.; Belov,~A V., Eroshenko,~E A., and Yudahin,~K F.: Isotropic and anisotropic cosmic-ray variations in March – June 1991, I...

Read More
  • Cover Image

A Method for Real-time Gle Modeling : Volume 7, Issue 4 (26/10/2011)

By: E. V. Vashenyuk

Description: Polar Geophysical Institute, KSC Russian Academy of Sciences, Apatity, Russia. By now real time systems of data collection of neutron monitor network have been created. The main goal of such systems is early detection of dangerous events of space weather, such as GLE, caused by arrival to the Earth of relativistic solar protons. Characteristics of these particles are determined from the data of the worldwide neutron monitor network by methods of GLE mode...

Anashin, V., Belov, A., Eroshenko, E., Krjakunova, O., Mavromichalaki, H., Ishutin, I., Sarlanis, C., Souvatsoglo, G., Vashenyuk, E., and Yanke, V.: The ALERT signal of ground level enhancements of solar cosmic rays: physics basis, ways of realization and development, in: Proc. 31th ICRC, Lodz, ID 1104, 2009.; Cramp, L. J., Duldig, M. L., Flueckiger, E. O., Humble, J. E., Shea, M. A., and Smart, D. F.: The October 22, 1989, solar cosmic ray enhancement: an analysis of th...

Read More
  • Cover Image

Forbush Decreases – Clouds Relation in the Neutron Monitor Era : V...

By: R. Banjanac; V. Udovičić; D. Joković; A. Dragić; J. Puzović; D. Maletić; I. Aničin

Description: Institute of Physics, University of Belgrade, Pregrevica 118, Belgrade, Serbia. The proposed influence of cosmic rays on cloud formation is tested for the effect of sudden intensity changes of CR (Forbush decreases) on cloudiness. An attempt is made to widen the investigated period covered by satellite observation of cloudiness. As an indicator of cloud cover, the diurnal temperature range (DTR - a quantity anticorrelated with cloudiness) is used. The s...

Calogovic, J., Albert, C., Arnold, F., Beer, J., Desorgher, L., and Flueckiger, O.: Sudden cosmic ray decreases: No change of global cloud cover, Geophys. Res. Lett., 37, L03802, doi:10.1029/2009GL041327, 2010.; Dai, A., Trenberth, K. E., and Karl, T. R.: Effects of Clouds, Soil Moisture, Precipitation and Water Vapor on Diurnal Temperature Range, J. Climate, 12, 2451–2473, 1999.; Dickinson, R. E.: Solar variability and ...

Read More
  • Cover Image

The Focal Surface of the Jem-euso Instrument : Volume 7, Issue 2 (...

By: Y. Kawasaki; M. Ricci; F. Kajino; A. Santangelo; M. Casolino; T. Ebisuzaki; P. Gorodetzky; the Jem-euso Collaboration

Description: Computational Astrophysics Lab., RIKEN, 2-1 Hirosawa, Wako 351-0198, Japan. The Extreme Universe Space Observatory on JEM/EF (JEM-EUSO) is a space mission to study extremely high-energy cosmic rays. The JEM-EUSO instrument is a wide-angle refractive telescope in the near-ultraviolet wavelength region which will be mounted to the International Space Station. Its goal is to measure time-resolved fluorescence images of extensive air showers in the atmosphere...

Ahmad, S., Barrillon, P., Blin-Bondil, S., Dagoret-Campagne, s., de La Taille, C., Dulucq, F., Kawasaki Y., and Hirokazu, I.: SPACIROC: a rad-hard front-end readout chip for the JEM-EUSO telescope, 2010 JINST 5 C12012, doi: 10.1088/1748-0221/5/12/C12012, 2010.; Takahashi, Y. and the JEM-EUSO Collaboration: New J. Phys., 11, 065009, doi: 10.1088/1367-2630/11/6/065009, 2009.

Read More
  • Cover Image

Linsley's Eas Time Structure Method for the Primary Cosmic Ray Spe...

By: K. Saito; A. Iyono; S. Ohara; N. Ochi; T. Konishi; K. Okei; I. Yamamoto; S. Tsuji; H. Matsumoto; T. Nakatsuka; N. Ohmori; N. Takahashi; T. Nakamura

Description: Dept. of Fundamental Science, Okayama University of Science, Okayama 700-0005, Japan. We have installed a shift register system of extensive air show (EAS) particles in a compact EAS array built on the rooftop of the Faculty of Engineering building in the campus of Okayama University of Science and being operated since April 2006 as part of Large Area Air Shower (LAAS) experiments , in order to register each arrival time of EAS particles within 5 μs. Det...

Abraham, J. et al. (Pierre Auger Collaboration): Measurement of the energy spectrum of cosmic rays above 1018 eV using the Pierre Auger Observatory, Phys. Lett. B, 685, 239–246, 2010.; Bezboruah, T., Boruah, K., and Boruah, P. K.: A non conventional method of UHE cosmic ray detection, Astropart. Phys., 11, 395–402, 1999.; Bleve, C., Parsons, R. D., Knapp, J. et al.: Systematic uncertainties in air shower measurements from high-energy hadronic interaction model...

Read More
  • Cover Image

Moving an Asteroid with Electric Solar Wind Sail : Volume 6, Issue...

By: P. Janhunen; S. Merikallio

Description: Finnish Meteorological Institute, Po. Box. 503, FIN-00101, Helsinki, Finland. The electric solar wind sail (E-Sail) is a new propulsion method for interplanetary travel which was invented in 2006 and is currently under development. The E-Sail uses charged tethers to extract momentum from the solar wind particles to obtain propulsive thrust. According to current estimates, the E-Sail is 2-3 orders of magnitude better than traditional propulsion methods (ch...

Read More
  • Cover Image

Cosmic Ray Physics in Space: the Role of Sergey Vernov's Scientifi...

By: M. I. Panasyuk

Description: Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia. Cosmic rays were discovered almost 100 years ago. Since then the scientific world has learned a lot from their nature: the particles nascent in the Universe, both in our Galaxy and outside, the basic mechanisms of their acceleration, transfer in the interstellar environment and the interaction of the primary cosmic rays with the atmosphere surrounding the Earth. Befor...

Alfvén, H.: Cosmic Electrodynamics, Oxford Univ. Press, 1950.; Auger, P. and Ehrenfest, P.: \blackbox (title), J. de Phys., 6, 255, 1935.; Berezhko, E. G., Elshin, V. K., and Ksenofontov, L. T.: \blackbox (title), ZhETF \blackbox , 109, 3, 1996 (in Russian).; Grigorov, N. L., Nesterov, V. E., Rapoport, I. D., and Savenko, I. A.: Space Research XII, Academic Verlag, Berlin, 1972.; Grigorov, N. L.: \blackbox (title), Yad. Physica, 51, 157, 1990 (in Russian).; Hess, V.: \bl...

Read More
  • Cover Image

Noy: a Neutrino Observatory Network Project Based on Stand Alone A...

By: D. Lebrun; E. Lagorio; P. Stassi; J. Chauvin; F. Montanet

Description: Laboratoire de Physique Subatomique et de Cosmologie, IN2P3/CNRS, Université Joseph Fourier, Grenoble, 53 Avenue des Martyrs, 38026 Grenoble, France. We have developed a self powered stand alone particle detector array dedicated to the observation of horizontal tau air showers induced by high energy neutrinos interacting in mountain rock. Air shower particle detection reaches a 100% duty cycle and is practically free of background when compared to Cherenk...

Abraham, J. et al. (Pierre Auger Collab.): Upper Limit on the Diffuse Flux of Ultrahigh Energy Tau Neutrinos from the Pierre Auger Observatory, Phys. Rev. Lett., 100, 211101, 2008.; Abraham, J. et al. (The Pierre Auger Collab.): Limit on the diffuse flux of ultrahigh energy tau neutrinos with the surface detector of the Pierre Auger Observatory, Phys. Rev. D, 79, 102001, 2009.; Agnetta, A. et al. (ULTRA Collaboration): Extensive air showers and diffused Cherenkov light d...

Read More
  • Cover Image

High-energy Neutrino Astronomy : Volume 7, Issue 1 (03/02/2011)

By: A. Kouchner

Description: AstroParticle and Cosmology University Paris 7 Diderot, 10 rue A. Domon et L. Duquet, 75205, Paris cedex 13, France. Neutrinos constitute a unique probe since they escape from their sources, travel undisturbed on cosmological distances and are produced in high-energy (HE) hadronic processes. In particular they would allow a direct detection and unambiguous identification of the acceleration sites of HE baryonic cosmic rays (CR), which remain unknown. The ...

\blackbox; Aggouras, G. et al. (Nestor collaboration): Recent results from NESTOR, Nucl. Instrum. Meth. A, 567, 452–456, 2006. \blackbox%; Aguilar, J. A. et al. (Antares collaboration): The data acquisition system for the ANTARES neutrino telescope, Nucl. Instrum. Meth. A, 570, 107–116, 2007.; Aguilar, J. A. et al. (Antares collaboration): The data acquisition system for the ANTARES neutrino telescope, Nucl. Instrum. Meth. A, 570, 107–116, 2007.; Aharonian F. et al. (Hes...

Read More
  • Cover Image

Measurements and Interpretation of Registration of Large Number of...

By: K. Jędrzejczak; J. Karczmarczyk; M. Kasztelan; Z. Dębicki; P. Tokarski; B. Szabelska; R. Lewandowski; T. Wibig; J. Szabelski; J. Orzechowski

Description: The Andrzej Sołtan Institute for Nuclear Studies (IPJ), Cosmic Ray Laboratory, 90–950 Łódź 1, P.O.Box 447, Poland. We register events with large number of neutrons at the ground level as well as in the underground laboratory. These neutrons are produced in secondary cosmic ray interactions with matter surrounding the neutron detectors. We used the set of helium-3 filled gas proportional counters and plastic scintillators. We performed a series of...

Chubenko, A. P.,Shchepetov, A. L., Vildanova, L. I., Vildanova, M. I., und Chubenko, P. A.: Neutron Events in the Underground Monitor of the Tien Shan High-Altitude Station, Bull. Lebedev Phys. Inst., 34, 4, 107–113, 2007.; Chubenko, A. P., Shepetov, A. L., Antonova, V. P., Chubenko, P. A., and Kryukov, S. V.: The influence of background radiation on the events registered in a neutron monitor at mountain heights, J. Phys. G: Nucl. Part. Phys., 35, 085202–085215, 2008.; C...

Read More
  • Cover Image

Observation of the Fermi Pulsar Catalog at Tev Energies with the T...

By: C. Le; X. Y. Zhaoyang Feng; K. Lu; M. Mu; A. Saito; C. Ding; L. K. Danzengluobu; C. F. Fan; H. W. Geng; F. Huang; L. Huang; M. Mizutani; T. K. Ozawa; Y. Jiang; S. Tan; H. H. Gou; B. Tateyama; M. Amenomori; K. He; A. F. Kato; X. Y. Yuda; Z. Y. Feng; Y.-q. Li; T. Sakata; X. R. Li; Ying Zhang; M. Guo; S. Nanjo; H. Li; S. W. Cui; M. Ohta; J. Hotta; J. Lou; M. Shibata; J. Y. Labaciren; H. C. Kawata; H. Y. Hu; C. T. Wang; T. Nishizawa; Zhang; Y. H. Shiomi; H. Torii; X. C. Wu; Q. X. Feng; Zhaxisangzhu; H. Meng; M. Saito; K. Liu; N. Shirai; H. B. Hibino; N. He; Z. H. Yamamoto; C. Kajino; X. J. Bi; Q. Haibing Hu; X. H. Ding; H. Sako; K. Kasahara; D. Chen; T. Y. Ohnishi; K. Jia; Y. Tsuchiya; Q. B. Gao; S. Sugimoto; H. Takita; I. Munakata; Zhang; H. R. Wang; S. Xue; N. J. Yuan; X. X. Zhang; A. F. Yang; H. M. Ye; Y. Zhang; Zhou; Y. G. Udo; G. M. Katayose; T. Yasue; Y. Wang; Zhang; J. L. Yu; L. Wang; G. C. Yan; Yi Zhang

Description: Department of Physics, Hirosaki University, Hirosaki 036-8561, Japan. Using the Tibet-III air shower array, we search for steady TeV γ-rays from 18 pulsars in the Fermi Large Area Telescope pulsar catalog. Among them, we observe 8 sources including the Crab instead of the expected 0.41 sources at a significance of 2 σ or more excess. Under the assumption of Poisson distribution, the chance probability is estimated to be 1.4×10−8. When the C...

Abdo, A. A., Allen, B., Berley, D. et al.: TeV Gamma-Ray Sources from a Survey of the Galactic Plane with Milagro, Astrophys. J., 664, 91 – 94, 2007.; Abdo, A. A., Ackermann, M., Ajello, M. et al.: Fermi/Large Area Telescope Bright Gamma-Ray Source List, Astrophys. J. Suppl., 183, 46 – 66, 2009a.; Abdo, A. A., Allen, B. T., Aune, T. et al.: Milagro Observations of Multi-TeV Emission from Galactic Sources in the Fermi Bright Source List, Astrophys. J., 700, 127 – 131, 200...

Read More
  • Cover Image

Helioseismology : Volume 4, Issue 1 (10/04/2008)

By: M. P. Di Mauro

Description: INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica-Roma, Italy. Helioseismology, the study of solar oscillations, has proved to be an extremely powerful tool for the investigation of the internal structure and dynamics of the Sun. Here I will review the present status of helioseismic studies and comment on recent results and on prospects for future investigations to solve the most discussed open questions associated with solar structure modelling.

Leighton, R. B., Noyes, R. W., and Simon, G. W.: Velocity fields in the solar atmosphere I. Preliminary report, Astrophys. J., 135, 474–499, 1962.; Asplund, M.: New Light on Stellar Abundance Analyses: Departures from LTE and Homogeneity, Ann. Rev. Astron. Astrophys., 43, 481–530, 2005.; Asplund, M., Grevesse, N., Sauval, A J., Allende Prieto, C., and Kiselman, D.: Line formation in solar granulation.IV.[OI], O I and OH lines and the photospheric O abundance, Astron. Ast...

Read More
  • Cover Image

Ionization in the Atmosphere, Comparison Between Measurements and ...

By: Y. I. Stozhkov; V. S. Makhmutov; N. S. Svirzhevsky; A. K. Svirzhevskaya; G. A. Bazilevskaya; T. Sloan

Description: University of Lancaster, UK. A survey of the data on measured particle fluxes and the rate of ionization in the atmosphere is presented. Measurements as a function of altitude, time and cut-off rigidity are compared with simulations of particle production from cosmic rays. The simulations generally give a reasonable representation of the data. However, some discrepancies are found. The solar modulation of the particle fluxes is measured and found to b...

Read More
 
1
|
2
|
3
Records: 1 - 20 of 45 - Pages: 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.