July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Turbulence-based model of the Forbush decrease

Aug 4, 2015, 4:00 PM
1h
Theater Foyer (World Forum)

Theater Foyer

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 17
Poster contribution SH-TH Poster 3 SH

Speaker

Michael Alania (Siedlce University)

Description

We show that the source of the energy dependence of the rigidity spectrum of the Forbush decrease (Fd) of the galactic cosmic ray (GCR) intensity are the structural changes in the interplanetary magnetic field (IMF) turbulence driven by the shock waves either directely creating near the Sun or shock waves related to the propagation of the CME in interplanetary space. We recognize that during the Fd is observed the 3-D turbulence of the IMF unlike to the ideal slab/2-D model. This turbulence generally is stipulated by fluctuations of the Alfven waves in all three spatial directions. We assume that Bx and By Components of the IMF are contributing in drift effect owing to theirs regular parts, while Bz does not, because of it consists only from the fluctuations. Based on the modeling of the GCR transport in the heliosphere we examine what conditions must be fulfilled to obtain the energy dependence of the rigidity spectrum of the Fd from the model. In order to build the most reliable 3D non-stationary model of the Fd, we discuss the various diffusion theories taking into account the perpendicular transport of the turbulence (e.g., Unified Non-Linear Transport-UNLT, Noisy Reduced MagnetoHydroDynamic-NRMHD).
Collaboration -- not specified --
Registration number following "ICRC2015-I/" 801

Primary author

Mrs Anna wawrzynczak (siedlce University)

Co-author

Michael Alania (Siedlce University)

Presentation materials

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