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The 1990 May 24 Solar Cosmic-Ray Event

Vainio, R.; Torsti, J.; Anttila, A. +2 more

This paper presents an integrated analysis of GOES 6, 7 and neutron monitor observations of solar cosmic-ray event following the 1990 May 24 solar flare. We have used a model which includes particle injection at the Sun and at the interplanetary shock front and particle propagation through the interplanetary medium. The model does not attempt to s…

A Joint Analysis of High-Energy Neutrons and Neutron-Decay Protons from a Flare

Vainio, R.; Torsti, J.; Usoskin, I. G. +2 more

A joint analysis of neutron monitor and GOES data is performed to study the production of high-energy neutrons at the Sun. The main objects of the research are the spectrum of >50 MeV neutrons and a possible spectrum of primary (interacting) protons which produced those neutrons during the major 1990 May 24 solar flare. Different possible scena…

A 2D Numerical Study of Explosive Events in the Solar Atmosphere

Inhester, B.; Innes, D.; Jin, S. -P.

Two-dimensional (2D) compressible magnetohydrodynamic simulations are performed to explore the idea that the asymmetric reconnection between newly emerging intranetwork magnetic field flux and pre-existing network flux causes the explosive events in the solar atmosphere. The dependence of the reconnection rate as a function of time on the density …

Propagation of Solar Cosmic Rays: Diffusion versus Focused Diffusion

Vainio, R.; Torsti, J.; Kocharov, L. G. +1 more

This paper is designed to bring to the attention the fact that the effect of focusing of solar energetic particles is always essential as compared with scattering, no matter how small the value of the mean free path may be. That is why, an ordinary (`focusing-free') diffusion approach can not be applied to the solar cosmic ray transport. In the ca…