Browsing Faculty of Natural and Agricultural Sciences by Subject "Solar wind"
Now showing items 1-10 of 18
-
Acceleration of solar wind particles by traveling interplanetary shocks
(IOP Publishing, 2019)The acceleration of thermal solar wind (SW) protons at spherical interplanetary shocks driven by coronal mass ejections is investigated. The SW velocity distribution is represented using κ-functions, which are transformed ... -
Correlation of long-term cosmic-ray modulation with solar activity parameters
(IOP Publishing, 2019)In this work, we analyze the long-term cosmic-ray modulation observed by the Hermanus neutron monitor, which is the detector with the longest cosmic-ray record, from 1957 July. For our study we use the force-field approximation ... -
Cosmic rays in the dynamic heliosphere
(Japan Society of Plasma Science and Nuclear Fusion Research, 2009)he relation between the dynamics of the heliosphere, its shape and geometry, so lar activity and cosmic ray variations is addressed. The global features of the helio sphere influence what happens inside its boundaries ... -
Cosmic-ray transport in heliospheric magnetic structures. II. Modeling particle transport through corotating interaction regions
(IOP, 2017)The transport of cosmic rays (CRs) in the heliosphere is determined by the properties of the solar wind plasma. The heliospheric plasma environment has been probed by spacecraft for decades and provides a unique opportunity ... -
Current sheets, magnetic islands, and associated particle acceleration in the solar wind as observed by Ulysses near the ecliptic plane
(IOP Publishing, 2019)Recent studies of particle acceleration in the heliosphere have revealed a new mechanism that can locally energize particles up to several MeV nucleon–1. Stream–stream interactions, as well as the heliospheric current sheet ... -
Forbush decreases and geomagnetic storms during a highly disturbed solar and interplanetary period, 4-10 September 2017
(AGU, 2019)Features and peculiarities of the cosmic ray intensity (CRI) and the geomagnetic activity, along with several solar plasma and interplanetary magnetic field, during the period 4–10 September 2017 are studied. The period ... -
A generalized Fisk-type HMF: implications of spatially dependent photospheric differential rotation
(IOP Publishing, 2020)The existence of a Fisk-type heliospheric magnetic field (HMF) has been debated ever since Fisk proposed an alternative to the traditional view of the HMF first proposed by Parker. Several modifications of the original ... -
A generalized two-component model of solar wind turbulence and ab initio diffusion mean-free paths and drift lengthscales of cosmic rays
(IOP Publishing, 2016)We extend a two-component model for the evolution of fluctuations in the solar wind plasma so that it is fully three-dimensional (3D) and also coupled self-consistently to the large-scale magnetohydrodynamic equations ... -
The implications of simple estimates of the 2D outerscale based on measurements of magnetic islands for the modulation of galactic cosmic-ray electrons
(IOP Publishing, 2019)The behavior of the 2D turbulence power spectrum at the lowest wavenumbers has a significant effect on the perpendicular diffusion coefficients of charged particles in the heliosphere derived from various scattering theories, ... -
Latitudinal gradients of galactic cosmic rays during the 2007 solar minimum
(IOP Publishing, 2008)Ulysses, launched in 1990 October in the maximum phase of solar cycle 22, completed its third out-of-ecliptic orbit in 2008 February. This provides a unique opportunity to study the propagation of cosmic rays over a wide ...