2-5 October 2017
Hotel Intourist Kolomenskoye 4*
Europe/Moscow timezone

About cosmic ray sources

3 Oct 2017, 17:30
15m
Moskvorechye-2 hall (Hotel Intourist Kolomenskoye 4*)

Moskvorechye-2 hall

Hotel Intourist Kolomenskoye 4*

Kashyrskoye shosse, 39B, Moscow, Russia, 115409
Plenary/section talk Neutrino and astroparticle physics Neutrino and astroparticle physics - 1

Speaker

Prof. Yuri Stozhkov (Lebedev Physical Institute, RAS)

Description

It is commonly accepted that the main sources of cosmic rays in the Galaxy are the supernovae explosions. Protons, nuclei and electrons are accelerated by shock waves produced by supernovae explosions. According to theory, maximum energy of accelerated protons can be as much as 10^16 eV. For nuclei it is Z times higher where Z is a nucleus electric charge. Other sources of cosmic rays cold be active dwarf stars. In Galaxy there are about 4*10^11 stars and more than 90% of these stars are in the bottom part the main sequence of Gerzsprunger -Ressel diagram. Many of dwarf stars are very active and produce power stellar flares. The Sun is yellow dwarf star of G2 class. The power solar flares occur one per year and they accelerate protons up to energy about (10-20) GeV. Maximum energy released in power solar flares is about 10^32 ergs. Stellar flares on active red dwarf stars are observed more often (several times per day) and the energy released during such events can have a value about 10^36 ergs. It is possible that the energy of accelerated protons could be as high as 10^14 eV. The evaluations show that the stellar flares could provide the energy density in Galaxy equals to ~1 eV/cm^3. Many of dwarf stars are not so far from the solar system (as the luminosities of these stars are very low they can be observed at the distances less than 50 kpc). New data on spectra of galactic protons and alfa-particles in the energy range from 50 GeV up to several hundreds GeV obtained in space experiments of PAMELA and AMS-02 show the complex energy dependence of spectral index. These data support the suggestion on the existence of nearby cosmic ray sources. Cosmic rays accelerated in supernovae explosions (the distances about 1 kpc and more) are in Galaxy about 10^8 years/ So, their spectra have to be smoothed.

Primary author

Dr. Yuri Kopysov (Insitute of Nuclear Research, RAS)

Co-authors

Prof. Yuri Stozhkov (Lebedev Physical Institute, RAS)

Presentation Materials

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