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Sabbah, I.

doi:10.1023/a:1005113317072

Cited by 10 publications

(2 citation statements)

References 14 publications

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“…The diurnal anisotropy is the anisotropy component along the equatorial plane, while the NS anisotropy is the component along the Earth's spin axis. By analyzing the yearly mean anisotropy observed with several NMs and muon detectors, a series of studies revealed long term variations of the radial and latitudinal gradients of GCR density in the heliosphere as well as variations in mean-free-paths of GCRs scattered by magnetic irregularities (Swinson 1969;Bieber & Chen 1991;Chen & Bieber 1993;Hall et al 1996Hall et al , 1997Ahluwalia & Dorman 1997;Sabbah 1999;Munakata et al 2002). These studies provide important information on the large-scale distribution of GCRs and enable us to make crucial tests of physical models for the modulation of GCRs in the heliosphere.…”

Section: Introductionmentioning

confidence: 99%

Drift Effects and the Cosmic Ray Density Gradient in a Solar Rotation Period: First Observation with the Global Muon Detector Network (GMDN)

Okazaki

Fushishita

Narumi

et al. 2008

ApJ

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We present for the first time hourly variations of the spatial density gradient of 50 GeV cosmic rays within a sample solar rotation period in 2006. By inversely solving the transport equation, including diffusion, we deduce the gradient from the anisotropy that is derived from the observation made by the Global Muon Detector Network (GMDN). The anisotropy obtained by applying a new analysis method to the GMDN data is precise and free from atmospheric temperature

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Section: Introductionmentioning

confidence: 99%

Drift Effects and the Cosmic Ray Density Gradient in a Solar Rotation Period: First Observation with the Global Muon Detector Network (GMDN)

Okazaki

Fushishita

Narumi

et al. 2008

ApJ

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“…The geomagnetic activity is correlated with the southward magnetic field component [54]. Sabbah [55] obtained an inverse correlation between cosmic ray intensity and the geomagnetic activity and observed the enhancement in upper cut-off rigidity, Rc, and the geomagnetic activity resulting from variation in the solar plasma parameters. Sabbah [55] obtained an inverse correlation between cosmic ray intensity and the geomagnetic activity and observed the enhancement in upper cut-off rigidity, Rc, and the geomagnetic activity resulting from variation in the solar plasma parameters.…”

Section: Resultsmentioning

confidence: 99%

Influence of solar heliospheric parameters on cosmic rays anisotropy

Mishra¹,

Mishra

2006

Astrophysics

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In the present work the cosmic ray data of three different neutron monitoring stations, Deep River, Inuvik, and Tokyo, located at different geomagnetic cutoff rigidities and altitudes have been harmonically analyzed for the period 1980-95 for a comparative study of diurnal semi-diurnal and tri-diurnal anisotropies in cosmic ray intensity in connection with the change in interplanetary magnetic field Bz component and solar wind velocity on 60 quietest days. It is observed that the amplitudes of all the three harmonics increase during the period 1982-84 at all the stations during the high speed solar wind stream epoch and remain low during the declining phase of the stream. The amplitudes of the three harmonics have no obvious characteristics associated with the time variation of magnitude of the Bz component. The phases of all the three harmonics have no time variation characteristics associated with solar wind velocity and Bz. Key words: cosmic rays: anisotropy: interplanetary magnetic field: solar poloidal magnetic field 1. Introduction Cosmic ray (CR) intensity exhibits a daily variation composed of a prominent diurnal component and also a semidiurnal component of lesser amplitude. The diurnal, semi-diurnal as well as the tri-diurnal variation play an important role in constructing the whole picture of the modulation mechanism of the cosmic ray intensity in interplanetary space. The CR variations observed near the Earth are an integral result of numerous solar and heliospheric phenomena, so any parameter alone cannot determine the behavior of CR. Ballif et al. [1] correlated Kp and Ap with the mean fluctuations in amplitude of the interplanetary magnetic field (IMF), which in turn is related to the diffusive component of convectiondiffusion theory. Ap is also found to be related to solar wind velocity, V, which is related to the convective component of convection-diffusion theory. Days on which the transient magnetic variations are regular and smooth are said to be magnetically quiet or calm or Q days. These are the days with low values of Ap and Kp. According to solar geophysical data (SGD) the five quietest

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Effect of solar heliospheric parameters on different components of daily variation in cosmic rays

Mishra

2007

Earth Moon Planet

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Cited by 10 publications

References 14 publications

Drift Effects and the Cosmic Ray Density Gradient in a Solar Rotation Period: First Observation with the Global Muon Detector Network (GMDN)

Drift Effects and the Cosmic Ray Density Gradient in a Solar Rotation Period: First Observation with the Global Muon Detector Network (GMDN)

Influence of solar heliospheric parameters on cosmic rays anisotropy

Effect of solar heliospheric parameters on different components of daily variation in cosmic rays

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