Peculiarities of cosmic ray modulation in the solar minimum 23/24

We study changes of the galactic cosmic ray (GCR) intensity for the ending period of the solar cycle 23 and the beginning of the solar cycle 24 using neutron monitors experimental data. We show that an increase of the GCR intensity in 2009 is generally related with decrease of the solar wind velocit...

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Bibliographic Details
Published in:Journal of geophysical research. Space physics 2014-06, Vol.119 (6), p.4164-4174
Main Authors: Alania, M. V., Modzelewska, R., Wawrzynczak, A.
Format: Article
Language:English
Subjects:
Change detection
Cosmic ray modulation
Cosmic rays
Diffusion coefficient
Interplanetary magnetic field
Magnetic fields
modeling of cosmic ray transport
Modulation
Monitors
Polarity
Rigidity
rigidity dependence of GCR variation
solar activity
Solar cycle
Solar minimum
Solar wind
Solar wind parameters
Solar wind velocity
Two dimensional models
Wind speed
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Summary:We study changes of the galactic cosmic ray (GCR) intensity for the ending period of the solar cycle 23 and the beginning of the solar cycle 24 using neutron monitors experimental data. We show that an increase of the GCR intensity in 2009 is generally related with decrease of the solar wind velocity U, the strength B of the interplanetary magnetic field (IMF), and the drift in negative (A  10 GV) is hard in the minimum and near‐minimum epoch. We do not recognize any nonordinary changes in the physical mechanism of modulation of the GCR intensity in the rigidity range of GCR particles to which neutron monitors respond. We compose 2‐D nonstationary model of transport equation to describe variations of the GCR intensity for 1996–2012 including the A > 0 (1996–2001) and the A 
ISSN:2169-9380
2169-9402
DOI:10.1002/2013JA019500