Energy spectrum of variations of cosmic-ray daily mean intensity recorded during the I.G.Y.

Kane, R. P.

doi:10.1007/bf02785554

Cited by 6 publications

(2 citation statements)

References 21 publications

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“…To estimate the power law index for the rigidity dependence of FD, we have fitted the data with the above mentioned power function by using least square fitting. We have found γ = 0.31, which is within the range 0.2 < γ < 0.8 reported by Kane (1963) [12]. The FD amplitude at cut-off rigidity ∼ 1 GV is about twice of that at ∼ 12 GV, which is consistent with earlier observation [14].…”

Section: Methodssupporting

confidence: 92%

Quantitative understanding of Forbush decrease drivers based on shock-only and CME-only models using global signature of February 14, 1978 event

Raghav¹,

Bhaskar²,

Lotekar³

et al. 2014

J. Cosmol. Astropart. Phys.

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Abstract. We have studied Forbush decrease (FD) event occurred on February 14, 1978 using 43 neutron monitor observatories to understand the global signature of FD. We have studied rigidity dependence of shock amplitude and total FD amplitude. We have found almost the same power law index for both shock phase amplitude and total FD amplitude.Local time variation of shock phase amplitude and maximum depression time of FD have been investigated which indicate possible effect of shock/CME orientation. We have analyzed rigidity dependence of time constants of two phase recovery. Time constants of slow component of recovery phase show rigidity dependence and implies possible effect of diffusion. Solar wind speed was observed to be well correlated with slow component of FD recovery phase. This indicates solar wind speed as possible driver of recovery phase. To investigate the contribution of interplanetary drivers, shock and CME in FD, we have used shock-only and CME-only models. We have applied these models separately to shock phase and main phase amplitudes respectively. This confirms present accepted physical scenario that the first step of FD is due to propagating shock barrier and second step is due to flux rope of CME/magnetic cloud.

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Section: Methodssupporting

confidence: 92%

Quantitative understanding of Forbush decrease drivers based on shock-only and CME-only models using global signature of February 14, 1978 event

Raghav¹,

Bhaskar²,

Lotekar³

et al. 2014

J. Cosmol. Astropart. Phys.

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show abstract

“…Taking averages over a day, we obtain, using (5), ν 0 = 0.025 %. Since ν 0,1 = 0.026 % for this day, we get k = 0.96 and, finally, γ = −0.3, which agrees well with the typical values of the perturbation spectrum index under quiet conditions (Kane, 1963). In addition, once spectrum index is known, the amplitude of the variation can be found using Eq.…”

Section: Calculating the Power Law Index Using The Effective Rigiditysupporting

confidence: 83%

Estimation of index of power law rigidity spectrum of cosmic rays using effective rigidity of multidirectional muon detector

Kalugin

Кабин

2015

Earth Planet Sp

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We develop a new approach for calculating index of power law for variations in the differential rigidity spectrum of cosmic rays registered by Nagoya multidirectional muon detector. Our approach is based on effective rigidity which we define for the entire instrument, not just for its individual channels. Our definition of effective rigidity can be straightforwardly extended to other multichannel instruments and networks of instruments. As examples, we calculate the power law index under quiet conditions and during 12 Forbush decrease events. We also discuss sensitivity of the Nagoya muon detector to different values of the power law index and different rigidities.

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The Time Variations of the Cosmic Ray Intensity

Quenby¹

1967

Kosmische Strahlung II / Cosmic Rays II

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Energy spectrum of variations of cosmic-ray daily mean intensity recorded during the I.G.Y.

Cited by 6 publications

References 21 publications

Quantitative understanding of Forbush decrease drivers based on shock-only and CME-only models using global signature of February 14, 1978 event

Quantitative understanding of Forbush decrease drivers based on shock-only and CME-only models using global signature of February 14, 1978 event

Estimation of index of power law rigidity spectrum of cosmic rays using effective rigidity of multidirectional muon detector

The Time Variations of the Cosmic Ray Intensity

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