PERIODICITY IN DAILY VARIATION OF COSMIC RAY INTENSITY AS AN EFFECT OF SOLAR POLOIDAL MAGNETIC FIELD ORIENTATION

2004 ◽  
Vol 13 (02) ◽  
pp. 253-262 ◽  
Author(s):  
REKHA AGARWAL MISHRA ◽  
RAJESH K. MISHRA
Keyword(s):  
Magnetic Field ◽  
Daily Variation ◽  
Cosmic Ray ◽  
Activity Cycle ◽  
Solar Activity Cycle ◽  
Significant Shift ◽  
Poloidal Magnetic Field ◽  
Field Orientation ◽  
Cosmic Ray Intensity ◽  
Diurnal Anisotropy

A detailed analysis of the Deep River neutron monitor (NM) data for four different phases of solar activity cycle and for four groups of days chosen according to their different geomagnetic conditions is being carried out. It is found that the 60 quiet day (QD) in a year serve a better purpose for investigating the short/long term variation in cosmic ray (CR) intensity. Furthermore, data has been harmonically analysed for the period 1964–95 to investigate the effect of solar poloidal magnetic field (SPMF) orientation in daily variation (diurnal/semi-diurnal) of CR on geomagnetically QD. The phase of the diurnal and semi-diurnal anisotropy vectors on QD has shown a significant shift to early hours when the SPMF in the northern hemisphere (NH) is positive during the periods 1971–79 and 1992–95 as compared to that during the periods 1964–70 and 1981–90 when the SPMF in NH is negative, showing a periodic nature of daily variation in CR intensity with SPMF.

Galactic Cosmic Ray Intensity in the Upcoming Minimum of the Solar Activity Cycle

2018 ◽  
Vol 58 (2) ◽  
pp. 169-177 ◽  
Author(s):  
M. B. Krainev ◽  
G. A. Bazilevskaya ◽  
M. S. Kalinin ◽  
A. K. Svirzhevskaya ◽  
N. S. Svirzhevskii
Keyword(s):  
Solar Activity ◽  
Cosmic Ray ◽  
Activity Cycle ◽  
Solar Activity Cycle ◽  
Cosmic Ray Intensity ◽  
Galactic Cosmic Ray

scholarly journals Deriving the solar activity cycle modulation on cosmic ray intensity observed by Nagoya muon detector from October 1970 until December 2012

2016 ◽  
Vol 12 (S328) ◽  
pp. 130-133 ◽  
Author(s):  
Rafael R. S. de Mendonça ◽  
Carlos. R. Braga ◽  
Ezequiel Echer ◽  
Alisson Dal Lago ◽  
Marlos Rockenbach ◽  
...  
Keyword(s):  
Solar Activity ◽  
Cosmic Ray ◽  
Activity Cycle ◽  
Solar Activity Cycle ◽  
Atmospheric Temperature ◽  
Muon Detector ◽  
Natural Phenomena ◽  
Cosmic Ray Intensity ◽  
Temperature Changes ◽  
Muon Intensity

AbstractIt is well known that the cosmic ray intensity observed at the Earth's surface presents an 11 and 22-yr variations associated with the solar activity cycle. However, the observation and analysis of this modulation through ground muon detectors datahave been difficult due to the temperature effect. Furthermore, instrumental changes or temporary problems may difficult the analysis of these variations. In this work, we analyze the cosmic ray intensity observed since October 1970 until December 2012 by the Nagoya muon detector. We show the results obtained after analyzing all discontinuities and gaps present in this data and removing changes not related to natural phenomena. We also show the results found using the mass weighted method for eliminate the influence of atmospheric temperature changes on muon intensity observed at ground. As a preliminary result of our analyses, we show the solar cycle modulation in the muon intensity observed for more than 40 years.

Variations of the cosmic-ray intensity andK p data in the solar-activity cycle no. 19

1974 ◽  
Vol 11 (1) ◽  
pp. 29-32
Author(s):  
O. Filisetti ◽  
G. Lovera ◽  
C. Oldano ◽  
P. G. Tedde
Keyword(s):  
Solar Activity ◽  
Cosmic Ray ◽  
Activity Cycle ◽  
Solar Activity Cycle ◽  
Cosmic Ray Intensity

Distribution of the number of strong earthquakes and the intensity of space rays during the solar activity cycle

2020 ◽  
Author(s):  
Valery L. Yanchukovsky ◽  
◽  
Anastasiya Yu. Belinskaya ◽  
Keyword(s):  
Solar Activity ◽  
Cosmic Rays ◽  
Cosmic Ray ◽  
Activity Cycle ◽  
Solar Activity Cycle ◽  
Strong Earthquakes ◽  
Cosmic Ray Intensity ◽  
Relationship Of ◽  
The Relationship

The relationship of Earth's seismicity with solar activity is investigated using the results of continuous long–term observations of cosmic ray intensity, solar activity and the number of strong earthquakes. Modulation of the flux of cosmic rays is used as information on the level of solar activity, processes on the Sun and interplanetary medium. The distribution of the number of sunspots, the intensity of cosmic rays and the number of strong earthquakes in the solar cycle is presented.

DAILY VARIATION IN COSMIC RAY INTENSITY ON DIFFERENT GEOMAGNETIC CONDITIONS

2002 ◽  
Vol 11 (08) ◽  
pp. 1243-1253 ◽  
Author(s):  
SANTOSH KUMAR ◽  
REKHA AGARWAL ◽  
RAJESH MISHRA ◽  
S. K. DUBEY
Keyword(s):  
Daily Variation ◽  
Cosmic Ray ◽  
Short Term ◽  
Cosmic Ray Intensity ◽  
Diurnal Anisotropy ◽  
Different Types ◽  
Term Basis ◽  
Ap Index ◽  
Selection Of

A new concept of data analysis has been attempted for studying the long/short term daily variations in cosmic ray (CR) intensity recorded with neutron monitors/meson telescopes. Fourier Technique has been applied on four different types of groups of days chosen according to their different geomagnetic conditions. The selected groups are 60 quietest days (60 QD), 120 quiet days (120 QD), continuous quiet days (CQD) and All Days (AD) in a year. CQD is a new set of days selected on the basis of Ap and Kp values. These are the days when transient magnetic variations are supposed to be regular and smooth continuously for a span of at least three days. The criteria of selection of CQD is based upon the mathematical manipulation with Ap index. The data of Deep River neutron monitoring station is used for the period 1985–1995, to investigate for a com-parative study of diurnal anisotropy in CR intensity on 60 QD, 120 QD, CQD and AD. It is observed that 60 QD are most suitable for the anisotropic studies on short/long term basis. The time/spatial variations in the amplitude and phase of the diurnal anisotropy become more pronounced for 60 QD for the period under investigation.

scholarly journals 41. The solar daily variation of the cosmic ray intensity

1958 ◽  
Vol 6 ◽  
pp. 392-403
Author(s):  
H. Elliot ◽  
P. Rothwell
Keyword(s):  
Magnetic Field ◽  
Cosmic Rays ◽  
Daily Variation ◽  
Cosmic Ray ◽  
Earth’S Magnetic Field ◽  
Cosmic Ray Intensity ◽  
Primary Particles ◽  
Earth's Magnetic Field ◽  
East And West ◽  
Solar Daily Variation

Some recent measurements of the solar daily variation for cosmic rays incident from the east and west directions at 45° to the vertical in London are described. The results do not agree with those to be expected if the variation was due to a non-isotropic flux of primary particles entering the earth's magnetic field. This result is discussed in relation to other evidence and it is concluded that the daily variation is probably due to a modulation of the primary cosmic ray intensity in the earth's magnetic field.

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