نتایج جستجو برای: galactic cosmic ray

تعداد نتایج: 349069  

Journal: :Progress of Theoretical Physics Supplement 2003

1997
I. V. Moskalenko

We have made a new calculation of the cosmic-ray secondary positron spectrum using a diffusive halo model for Galactic cosmic-ray propagation. The code computes self-consistently the spectra of primary and secondary nucleons, primary electrons, and secondary positrons and electrons. The models are first adjusted to agree with the observed cosmic-ray Boron/Carbon ratio, and the interstellar prot...

Journal: :Monthly Notices of the Royal Astronomical Society 2017

Journal: :Proceedings of the International Astronomical Union 2008

Journal: :Physical review 2021

The precision measurements of the spectra cosmic ray nuclei and leptons in recent years have revealed existence multiple features, such as spectral break at $\sim 300$ GV rigidity seen by PAMELA AMS-02 more recently confirmed DAMPE CALET, softening H He 10$ TV reported DAMPE, confirming previous hints NUCLEON CREAM, a tiny change slope 40$ GeV electron spectrum, AMS-02, large $\sim$ TeV indirec...

2009
John Clem Paul Evenson

[1] Galactic cosmic ray electrons and nuclei respond differently to solar modulation, with the differences directly related to the reversals of the solar magnetic field, which occur every 11 years. If the large-scale heliospheric magnetic field has certain types of structures, the charge sign of cosmic ray particles can affect their propagation. Careful study of the behavior of cosmic ray posit...

2008
F. L. Villante F. Vissani

Supernova remnants are likely to be the accelerators of the galactic cosmic rays. Assuming the correctness of this hypothesis, we develop a method to extract the parent cosmic ray spectrum from the VHE gamma ray flux emitted by supernova remnants (and other gamma transparent sources). We illustrate the use of this technique by applying it to the young SNR RX J1713.7-3946 which has been observed...

2008
Jaime Alvarez-Muñiz Ralph Engel Todor Stanev

Recently the AGASA Collaboration presented data suggesting a significant clustering of ultra-high energy cosmic rays coming from the outer Galaxy region. In this paper we calculate expected cosmic ray arrival distributions for several simple, limiting source location scenarios and investigate the possibility of clustering and correlation effects. The role of the Galactic magnetic field is discu...

Journal: :Physical review letters 2004
J Ahrens X Bai S W Barwick T Becka J K Becker E Bernardini D Bertrand F Binon A Biron D J Boersma S Böser O Botner A Bouchta O Bouhali T Burgess S Carius T Castermans A Chen D Chirkin B Collin J Conrad J Cooley D F Cowen A Davour C De Clercq T DeYoung P Desiati J P Dewulf P Ekström T Feser T K Gaisser R Ganugapati M Gaug H Geenen L Gerhardt A Goldschmidt A Gross A Hallgren F Halzen K Hanson R Hardtke T Harenberg T Hauschildt K Helbing M Hellwig P Herquet G C Hill D Hubert B Hughey P O Hulth K Hultqvist S Hundertmark J Jacobsen A Karle M Kestel L Köpke M Kowalski K Kuehn J I Lamoureux H Leich M Leuthold P Lindahl I Liubarsky J Madsen K Mandli P Marciniewski H S Matis C P McParland T Messarius Y Minaeva P Miocinović R Morse K Münich R Nahnhauer T Neunhöffer P Niessen D R Nygren H Ogelman Ph Olbrechts C Pérez de los Heros A C Pohl R Porrata P B Price G T Przybylski K Rawlins E Resconi W Rhode M Ribordy S Richter J Rodríguez Martino H G Sander K Schinarakis S Schlenstedt T Schmidt D Schneider R Schwarz A Silvestri M Solarz G M Spiczak C Spiering M Stamatikos D Steele P Steffen R G Stokstad K H Sulanke I Taboada L Thollander S Tilav W Wagner C Walck Y R Wang C H Wiebusch C Wiedemann R Wischnewski H Wissing K Woschnagg G Yodh

We present the results of a search for point sources of high-energy neutrinos in the northern hemisphere using AMANDA-II data collected in the year 2000. Included are flux limits on several active-galactic-nuclei blazars, microquasars, magnetars, and other candidate neutrino sources. A search for excesses above a random background of cosmic-ray-induced atmospheric neutrinos and misreconstructed...

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