Variance of the Galactic nuclei cosmic ray flux
نویسندگان
چکیده
منابع مشابه
Isotopic Composition of Galactic Cosmic Ray Nuclei
Galactic cosmic rays represent a directly accessible sample of matter that originates outside the solar system, The elemental and isotopic composition of this sample of high-energy matter contains a record of nucleosynthesis in other regions of the galaxy, and of subsequent nuclear and electromagnetic interactions that have altered its composition. There have recently been significant new advan...
متن کاملThe Isotopic Composition of Galactic Cosmic-ray Iron Nuclei
We report high-resolution observations made in interplanetary space of 83-284 MeV per nucleon galactic cosmic-ray iron isotopes and directly establish that 56Fe is the dominant cosmic-ray Fe isotope. We find the following percentage abundances for Fe at the cosmic-ray source: 54Fe = 9(+8, -5)%, 55Fe:::; 7%, 56Fe = 91(+5, -11)%, 57Fe:::; 8%, and 58Fe:::; 6%. When compared to calculated nucleosyn...
متن کاملActive Galactic Nuclei and the Cosmic X-Ray Background
Active Galactic Nuclei (AGNs) are the most luminous objects in the Universe (besides Gamma-Ray Bursts). Typical spatial scales for these objects are estimated from time variability, giving sizes of around one parsec (Clavel al. 1991, Peterson et al. 1992), similar to our solar system, but with typical luminosities 1011 larger than the Sun. It is believed that their energy comes from the inflow ...
متن کاملGalactic cosmic ray flux decline and periodicities in the interplanetary
[1] Ti and Al activities and heavy nuclei tracks produced by cosmic rays have been measured in 19 stone meteorites that fell during the period 1766 to 2001. The gamma activity measurements of cosmogenic isotopes were performed using a highly specific and selective large volume Ge-NaI (Tl) spectrometer. The Ti activity, corrected for the target element abundances and shielding effects, shows a d...
متن کاملProbing the Galactic cosmic ray flux with submillimeter and gamma ray data
The study of Galactic diffuse γ radiation combined with the knowledge of the distribution of the molecular hydrogen in the Galaxy offers a unique tool to probe the cosmic ray flux in the Galaxy. A methodology to study the level of the cosmic ray "sea" and to unveil target-accelerator systems in the Galaxy, which makes use of the data from the high resolution survey of the Galactic molecular clo...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2012
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201219502