The role of corotating interaction regions in cosmic-ray modulation

1991 ◽  
Vol 18 (10) ◽  
pp. 1797-1800 ◽  
Author(s):  
J. Kóta ◽  
J. R. Jokipii
Keyword(s):  
Cosmic Ray ◽  
Corotating Interaction Regions ◽  
Cosmic Ray Modulation ◽  
Interaction Regions

scholarly journals Cosmic ray modulation by corotating interaction regions

2008 ◽  
Vol 4 (S257) ◽  
pp. 425-427 ◽  
Author(s):  
Jaša Čalogović ◽  
Bojan Vršnak ◽  
Manuela Temmer ◽  
Astrid M. Veronig
Keyword(s):  
Solar Wind ◽  
Time Lag ◽  
Cosmic Ray ◽  
Central Meridian ◽  
Corotating Interaction Regions ◽  
Cosmic Ray Modulation ◽  
Cross Correlation Analysis ◽  
Interaction Regions ◽  
The Relationship

AbstractWe analyzed the relationship between the ground-based modulation of cosmic rays (CR) and corotating interaction regions (CIRs). Daily averaged data from 8 different neutron monitor (NM) stations were used, covering rigidities from Rc = 0 − 12.91 GeV. The in situ solar wind data were taken from the Advanced Composition Explorer (ACE) database, whereas the coronal hole (CH) areas were derived from the Solar X-Ray Imager onboard GOES-12. For the analysis we have chosen a period in the declining phase of solar cycle 23, covering the period 25 January–5 May 2005. During the CIR periods CR decreased typically from 0.5% to 2%. A cross-correlation analysis showed a distinct anti-correlation between the magnetic field and CR, with the correlation coefficient (r) ranging from −0.31 to −0.38 (mean: −0.36) and with the CR time delay of 2 to 3 days. Similar anti-correlations were found for the solar wind density and velocity characterized by the CR time lag of 4 and 1 day, respectively. The relationship was also established between the CR modulation and the area of the CIR-related CH with the CR time lag of 5 days after the central-meridian passage of CH.

Cosmic-ray modulation, merged interaction regions, and multifractals

1993 ◽  
Vol 407 ◽  
pp. 347 ◽  
Author(s):  
L. F. Burlaga ◽  
J. Perko ◽  
J. Pirraglia
Keyword(s):  
Cosmic Ray ◽  
Cosmic Ray Modulation ◽  
Interaction Regions

Cosmic ray modulation in high and middle latitudes during solar cycles 22 and 23

2015 ◽  
Vol 93 (1) ◽  
pp. 100-104 ◽  
Author(s):  
Kingsley Chukwudi Okpala ◽  
Francisca Nneka Okeke ◽  
Anselem Ikechukwu Ugwuoke
Keyword(s):  
Cosmic Rays ◽  
Dynamic Pressure ◽  
Cosmic Ray ◽  
Galactic Cosmic Rays ◽  
Proton Density ◽  
Solar Cycles ◽  
Middle Latitudes ◽  
Cosmic Ray Modulation ◽  
Interaction Regions

Galactic cosmic rays are modulated in the heliosphere primarily by the global merged interaction regions with intense magnetic fields, which leads to a decrease in galactic cosmic rays throughout the heliosphere. Using long-term averages of solar wind (SW) component parameters in addition to cosmic ray count rates of four neutron monitors with different rigidity cutoffs, we analyzed the effect of these SW components on the count rates under different interplanetary magnetic field (IMF) disturbance levels. From first-order partial correlation, we found that the IMF-B was the most dominant modulating parameter, especially during quiet conditions and the SW dynamic pressure was more effective during disturbed conditions. The influence of more subtle parameters like wind speed, Bz component, and proton density were masked by these dominant parameters: IMF total B, and SW dynamic pressure.

Cosmic-Ray Transport in Heliospheric Magnetic Structures. II. Modeling Particle Transport through Corotating Interaction Regions

2017 ◽  
Vol 837 (1) ◽  
pp. 37 ◽  
Author(s):  
Andreas Kopp ◽  
Tobias Wiengarten ◽  
Horst Fichtner ◽  
Frederic Effenberger ◽  
Patrick Kühl ◽  
...  
Keyword(s):  
Particle Transport ◽  
Cosmic Ray ◽  
Corotating Interaction Regions ◽  
Magnetic Structures ◽  
Interaction Regions

scholarly journals On Cosmic Rays, IP Structures and Geospace Consequences During WHI

2009 ◽  
Vol 5 (H15) ◽  
pp. 488-490
Author(s):  
A. Dal Lago ◽  
F. L. Guarnieri ◽  
M. R. da Silva ◽  
W. D. Gonzalez ◽  
C. R. Braga ◽  
...  
Keyword(s):  
High Speed ◽  
Interplanetary Space ◽  
Cosmic Ray ◽  
Corotating Interaction Regions ◽  
Near Earth Space ◽  
Long Duration ◽  
Minimum Solar Activity ◽  
Interaction Regions ◽  
Muon Detection ◽  
Whole Heliosphere Interval

AbstractThis work presents some observations during the period of the Whole Heliosphere Interval (WHI) of the effects of interplanetary (IP) structures on the near-Earth space using three sets of observations: magnetic field and plasma from the Advanced Composition Explorer (ACE) satellite, ground-based cosmic ray data from the Global Muon Detection Network (GMDN) and geomagnetic indices (Disturbance storm-time, Dst, and auroral electrojet index, AE). Since WHI was near minimum solar activity, high speed streams and corotating interaction regions (CIRs) were the dominant structures observed in the interplanetary space surrounding Earth. Very pronounced geomagnetic effects are shown to be correlated to CIRs, especially because they can cause the so-called High-Intensity Long-Duration Continuous AE Activity (HILDCAAs) - Tsurutani and Gonzalez (1987). At least a few high speed streams can be identified during the period of WHI. The focus here is to characterize these IP structures and their geospace consequences.

Role of the Sun’s Nonaxisymmetric Open Flux in Cosmic‐Ray Modulation

2006 ◽  
Vol 644 (1) ◽  
pp. 638-645 ◽  
Author(s):  
Y.‐M. Wang ◽  
N. R. Sheeley, Jr. ◽  
A. P. Rouillard
Keyword(s):  
Cosmic Ray ◽  
Cosmic Ray Modulation ◽  
Open Flux
Sign in / Sign up

Export Citation Format

Share Document