Modulation of Galactic cosmic rays during the unusual solar minimum of cycle 24

Details Modulation of Galactic cosmic rays during the unusual solar minimum of cycle 24 Modulation of Galactic cosmic rays during the unusual solar minimum of cycle 24

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh51b1680l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH51B-1680

Physics

Plasma Physics

[7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7536] Solar Physics, Astrophysics, And Astronomy / Solar Activity Cycle, [7807] Space Plasma Physics / Charged Particle Motion And Acceleration, [7984] Space Weather / Space Radiation Environment

Scientific paper

Intensity of Galactic cosmic rays (GCR) measured during the recent solar minimum was the highest ever recorded since space age, while the magnitude of solar and interplanetary magnetic field and the speed of the solar wind in heliosphere was very low, but the tilt of heliospheric current sheet was not at the lowest level. This indicates that the modulation of cosmic ray is not dominated by the mechanism of particle drift through the current sheet during this A<0 cycle as we normally think. Possible reasons for the record cosmic ray flux include increase of particle diffusion and regular drift due to the weaker magnetic field, reduction of particle energy loss due to the slower solar wind speed, or closer termination shock radial distance due to smaller solar wind pressure. In this paper, We use a model of GCR transport in the three-dimensional heliosphere based on a simulation of Markov stochastic process to study the effect of these parameters. We will show which is the proper reason for the abnormally high observed GCR flux. Implication or relationship of this study to the understanding of the modulation of cosmic rays during historical deep solar minima will be discussed.

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