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Sabbah, I.; Darwish, A. A.; Bishara, A. A.

doi:10.1023/a:1005041102231

Cited by 7 publications

(4 citation statements)

References 4 publications

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“…Recent enhancements of solar wind velocity are closely associated with long-term decreases in the galactic cosmic ray intensity. The IMF magnitude and fluctuations are responsible for the depression of CR intensity during highspeed solar wind events [28]. The frequency histograms of solar wind velocity for HAE/LAE have been plotted in figures 1a and b.…”

Section: Resultsmentioning

confidence: 99%

A study of daily variation in cosmic ray intensity during high/low amplitude days

Mishra

2007

Pramana - J Phys

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A detailed study has been conducted on the long-term changes in the diurnal, semi-diurnal and tri-diurnal anisotropies of cosmic rays in terms of the high/low amplitude anisotropic wave train events (HAE/LAE) during the period 1981-94 using the neutron monitor data from Deep River Neutron Monitoring Station. In all, 38 HAE and 28 LAE cases have been studied. An inter-comparison of the first three harmonics during these events has been made so as to understand the basic reason for the occurrence of these types of events. It has been observed that the phase of diurnal anisotropy shifts towards earlier hours for HAEs and it shifts towards earlier hour as compared to 18-h direction for LAEs. For semi-diurnal anisotropy, phase remains statistically the same for both HAE and LAE. In the case of tri-diurnal anisotropy, phase is evenly distributed for both types of events. The interplanetary magnetic field (IMF) and solar wind plasma (SWP) parameters during these events are also investigated. It has also been observed that HAE/LAEs are weakly dependent on high-speed solar wind velocity. The two types of solar wind streams (corotating streams and flare-generated streams) produce significant deviations in cosmic ray intensity during HAE/LAE.

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Section: Resultsmentioning

confidence: 99%

A study of daily variation in cosmic ray intensity during high/low amplitude days

Mishra

2007

Pramana - J Phys

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“…We here used a Chree analysis by the superposed epoch method (Prasad, Garia, and Bhatt, 2013) which is a method for investigating the possible relation between two sets of observations. It is also used to test the relation between two diverse phenomena.…”

Section: Methodsmentioning

confidence: 99%

“…The IMF strength and its fluctuations are responsible for the decrease in CRI (Sabbah, 1996;Sabbah, Darwish, and Bishara, 1998;Mishra and Mishra, 2005). We also studied the rela- tionship between CRI and IMF B for the same period ( Figure 2) and found that the CRI "decreases" with increase in IMF B.…”

Section: Cri and Imfmentioning

confidence: 99%

“…After the discovery of FDs, many researchers began searching for the cause of these decreases and their relationship with geomagnetic activity (Barouch and Burlaga, 1975;Cane and Richardson, 1995;Kaushik, Shrivastava, and Rastogi, 2001;Prasad, Garia, and Bhatt, 2013). It was suggested that the high-magnetic-field regions (blobs) in interplanetary space are associated with FDs ( Barouch and Burlaga, 1975).…”

Section: Introductionmentioning

confidence: 99%

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Study of Cosmic Ray Intensity in Relation to the Interplanetary Magnetic Field and Geomagnetic Storms for Solar Cycle 23

et al. 2016

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We investigate the association of the cosmic-ray intensity (CRI) with the interplanetary magnetic field (IMF, B) and geomagnetic storms (GS) for the period 1997 -2006 (Solar Cycle 23). To do this, we conducted a Chree analysis by the superposed-epoch method. A transient decrease in CRI is found on the occurrence days of GS, and this decrease shows a similar pattern to that of the disturbance storm-time index (Dst). In addition, we show that the CRI decreases with the increase in IMF. The time lag between the decrease in CRI and increase in IMF is about one day or less. Furthermore, an increase in IMF B is found with the decrease in Dst index. IMF and Dst index are highly anti-correlated to each other, while the sunspot number is not found to be correlated with IMF, Dst index, or CRI for the period studied. The IMF is found to be an effective parameter combination for producing GS and Forbush decrease. We also found two types of decrease in CRI for Solar Cycle 23: i) symmetric and ii) asymmetric decreases. The study of CRI decreases may be useful for studying space-weather effects.

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Sabbah

1999

Solar Physics

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Cited by 7 publications

References 4 publications

A study of daily variation in cosmic ray intensity during high/low amplitude days

A study of daily variation in cosmic ray intensity during high/low amplitude days

Study of Cosmic Ray Intensity in Relation to the Interplanetary Magnetic Field and Geomagnetic Storms for Solar Cycle 23

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