Heliospheric modulation of cosmic rays: model and observation
Author:
Герасимова Сардаана1, Gerasimova Sardaana2, Гололобов Петр1, Gololobov Peter2, Григорьев Владислав1, Grigoryev Vladislav2, Кривошапкин Прокопий1, Krivoshapkin Prokopy2, Крымский Гермоген1, Krymsky Germogen2, Стародубцев Сергей1, Starodubtsev Sergei2
Affiliation:
1. Институт космофизических исследований и аэрономии им. Ю.Г. Шафера СО РАН 2. Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy SB RAS
Abstract
This paper presents the basic model of cosmic ray modulation in the heliosphere, developed in Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy of the Siberian Branch of RAS. The model has only one free modulation parameter: the ratio of the regular magnetic field to the turbulent one. It may also be applied to the description of cosmic ray intensity variations in a wide energy range from 100 MeV to 100 GeV. Possible mechanisms of generation of the mentioned turbulence field are considered. The primary assumption about the electrical neutrality of the heliosphere appears to be wrong, and the zero potential needed to match the model with observations in the plane of the solar equator can be achieved if the frontal point of the heliosphere, which is flowed around by interstellar gas, lies near the mentioned plane. We have revealed that the abnormal rise of cosmic ray intensity at the end of solar cycle 23 is related to the residual modulation produced by the subsonic solar wind behind the front of a standing shock wave. The model is used to describe features of cosmic ray intensity variations in several solar activity cycles.
Publisher
Infra-M Academic Publishing House
Subject
Space and Planetary Science,Atmospheric Science,Geophysics
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