caa a22 4500 445346272 CHVBK 20180317142829.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s11207-011-9778-6 doi (NATIONALLICENCE)springer-10.1007/s11207-011-9778-6 On the Relationship of the 27-day Variations of the Solar Wind Velocity and Galactic Cosmic Ray Intensity in Minimum Epoch of Solar Activity [Elektronische Daten] [M. Alania, R. Modzelewska, A. Wawrzynczak] We study the relationship of the 27-day variations of the galactic cosmic ray intensity with similar variations of the solar wind velocity and the interplanetary magnetic field based on observational data for the Bartels rotation period # 2379 of 23 November 2007 - 19 December 2007. We develop a three-dimensional (3-D) model of the 27-day variation of galactic cosmic ray intensity based on the heliolongitudinally dependent solar wind velocity. A consistent, divergence-free interplanetary magnetic field is derived by solving Maxwell's equations with a heliolongitudinally dependent 27-day variation of the solar wind velocity reproducing in situ observations. We consider two types of 3-D models of the 27-day variation of galactic cosmic ray intensity, i) with a plane heliospheric neutral sheet, and ii) with the sector structure of the interplanetary magnetic field. The theoretical calculations show that the sector structure does not significantly influence the 27-day variation of galactic cosmic ray intensity, as had been shown before, based on observational data. Furthermore, good agreement is found between the time profiles of the theoretically expected and experimentally obtained first harmonic waves of the 27-day variation of the galactic cosmic ray intensity (with a correlation coefficient of 0.98±0.02). The expected 27-day variation of the galactic cosmic ray intensity is inversely correlated with the modulation parameter ζ (with a correlation coefficient of −0.91±0.05), which is proportional to the product of the solar wind velocity V and the strength of the interplanetary magnetic field B (ζ∼VB). The high anticorrelation between these quantities indicates that the predicted 27-day variation of the galactic cosmic ray intensity mainly is caused by this basic modulation effect. Springer Science+Business Media B.V., 2011 Alania M. Institute of Mathematics and Physics, University of Natural Sciences and Humanities in Siedlce, 3 Maja 54, 08-110, Siedlce, Poland aut Modzelewska R. Institute of Mathematics and Physics, University of Natural Sciences and Humanities in Siedlce, 3 Maja 54, 08-110, Siedlce, Poland aut Wawrzynczak A. Institute of Computer Science, University of Natural Sciences and Humanities in Siedlce, 3 Maja 54, 08-110, Siedlce, Poland aut Solar Physics Springer Netherlands 270/2(2011-06-01), 629-641 0038-0938 270:2<629 2011 270 11207 https://doi.org/10.1007/s11207-011-9778-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-011-9778-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Alania M. Institute of Mathematics and Physics, University of Natural Sciences and Humanities in Siedlce, 3 Maja 54, 08-110, Siedlce, Poland aut NATIONALLICENCE 700 1- Modzelewska R. Institute of Mathematics and Physics, University of Natural Sciences and Humanities in Siedlce, 3 Maja 54, 08-110, Siedlce, Poland aut NATIONALLICENCE 700 1- Wawrzynczak A. Institute of Computer Science, University of Natural Sciences and Humanities in Siedlce, 3 Maja 54, 08-110, Siedlce, Poland aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 270/2(2011-06-01), 629-641 0038-0938 270:2<629 2011 270 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer