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Title: On the reason for the kink in the rigidity spectra of cosmic-ray protons and helium nuclei near 230 GV

Abstract

A three-component phenomenological model describing the specific features of the spectrum of cosmic-ray protons and helium nuclei in the rigidity range of 30–2×10{sup 5} GV is proposed. The first component corresponds to the constant background; the second, to the variable “soft” (30–500 GV) heliospheric source; and the third, to the variable “hard” (0.5–200 TV) source located inside a local bubble. The existence and variability of both sources are provided by the corresponding “surfatron accelerators,” whose operation requires the presence of an extended region with an almost uniform (in both magnitude and direction) magnetic field, orthogonally (or obliquely) to which electromagnetic waves propagate. The maximum energy to which cosmic rays can be accelerated is determined by the source size. The soft source with a size of ∼100 AU is located at the periphery of the heliosphere, behind the front of the solar wind shock wave. The hard source with a size of >0.1 pc is located near the boundary of an interstellar cloud at a distance of ∼0.01 pc from the Sun. The presence of a kink in the rigidity spectra of p and He near 230 GV is related to the variability of the physical conditions in the acceleration regionmore » and depends on the relation between the amplitudes and power-law exponents in the dependences of the background, soft heliospheric source, and hard near galactic source. The ultrarelativistic acceleration of p and He by an electromagnetic wave propagating in space plasma across the external magnetic field is numerically analyzed. Conditions for particle trapping by the wave and the dynamics of the particle velocity and momentum components are considered. The calculations show that, in contrast to electrons and positrons (e{sup +}), the trapped protons relatively rapidly escape from the effective potential well and cease to accelerate. Due to this effect, the p and He spectra are softer than that of e{sup +}. The possibility that the spectra of accelerated protons deviate from standard power-law dependences due to the surfatron mechanism is discussed.« less

Authors:
; ; ;  [1]
  1. Russian Academy of Sciences, Space Research Institute (Russian Federation)
Publication Date:
OSTI Identifier:
22614108
Resource Type:
Journal Article
Resource Relation:
Journal Name: Plasma Physics Reports; Journal Volume: 42; Journal Issue: 7; Other Information: Copyright (c) 2016 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLITUDES; COSMIC RADIATION; DISTANCE; ELECTROMAGNETIC RADIATION; ELECTRONS; HELIOSPHERE; HELIUM; KINK INSTABILITY; MAGNETIC FIELDS; PLASMA; POSITRONS; RELATIVISTIC RANGE; SHOCK WAVES; SOLAR WIND; SPECTRA; TRAPPED PROTONS

Citation Formats

Loznikov, V. M., E-mail: loznikov@yandex.ru, Erokhin, N. S., Zol’nikova, N. N., and Mikhailovskaya, L. A.. On the reason for the kink in the rigidity spectra of cosmic-ray protons and helium nuclei near 230 GV. United States: N. p., 2016. Web. doi:10.1134/S1063780X16070072.
Loznikov, V. M., E-mail: loznikov@yandex.ru, Erokhin, N. S., Zol’nikova, N. N., & Mikhailovskaya, L. A.. On the reason for the kink in the rigidity spectra of cosmic-ray protons and helium nuclei near 230 GV. United States. doi:10.1134/S1063780X16070072.
Loznikov, V. M., E-mail: loznikov@yandex.ru, Erokhin, N. S., Zol’nikova, N. N., and Mikhailovskaya, L. A.. Fri . "On the reason for the kink in the rigidity spectra of cosmic-ray protons and helium nuclei near 230 GV". United States. doi:10.1134/S1063780X16070072.
@article{osti_22614108,
title = {On the reason for the kink in the rigidity spectra of cosmic-ray protons and helium nuclei near 230 GV},
author = {Loznikov, V. M., E-mail: loznikov@yandex.ru and Erokhin, N. S. and Zol’nikova, N. N. and Mikhailovskaya, L. A.},
abstractNote = {A three-component phenomenological model describing the specific features of the spectrum of cosmic-ray protons and helium nuclei in the rigidity range of 30–2×10{sup 5} GV is proposed. The first component corresponds to the constant background; the second, to the variable “soft” (30–500 GV) heliospheric source; and the third, to the variable “hard” (0.5–200 TV) source located inside a local bubble. The existence and variability of both sources are provided by the corresponding “surfatron accelerators,” whose operation requires the presence of an extended region with an almost uniform (in both magnitude and direction) magnetic field, orthogonally (or obliquely) to which electromagnetic waves propagate. The maximum energy to which cosmic rays can be accelerated is determined by the source size. The soft source with a size of ∼100 AU is located at the periphery of the heliosphere, behind the front of the solar wind shock wave. The hard source with a size of >0.1 pc is located near the boundary of an interstellar cloud at a distance of ∼0.01 pc from the Sun. The presence of a kink in the rigidity spectra of p and He near 230 GV is related to the variability of the physical conditions in the acceleration region and depends on the relation between the amplitudes and power-law exponents in the dependences of the background, soft heliospheric source, and hard near galactic source. The ultrarelativistic acceleration of p and He by an electromagnetic wave propagating in space plasma across the external magnetic field is numerically analyzed. Conditions for particle trapping by the wave and the dynamics of the particle velocity and momentum components are considered. The calculations show that, in contrast to electrons and positrons (e{sup +}), the trapped protons relatively rapidly escape from the effective potential well and cease to accelerate. Due to this effect, the p and He spectra are softer than that of e{sup +}. The possibility that the spectra of accelerated protons deviate from standard power-law dependences due to the surfatron mechanism is discussed.},
doi = {10.1134/S1063780X16070072},
journal = {Plasma Physics Reports},
number = 7,
volume = 42,
place = {United States},
year = {Fri Jul 15 00:00:00 EDT 2016},
month = {Fri Jul 15 00:00:00 EDT 2016}
}