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On the relationship of cosmic ray intensity with solar, interplanetary, and geophysical parameters

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Abstract

The flux rate of cosmic rays incident on the Earth’s upper atmosphere is modulated by the solar wind and the Earth’s magnetic field. The amount of solar wind is not constant due to changes in solar activity in each solar cycle, and hence the level of cosmic ray modulation varies with solar activity. In this context, we have investigated the variability and the relationship of cosmic ray intensity with solar, interplanetary, and geophysical parameters from January 1982 through December 2008. Simultaneous observations have been made to quantify the exact relationship between the cosmic ray intensity and those parameters during the solar maxima and minima, respectively. It is found that the stronger the interplanetary magnetic field, solar wind plasma velocity, and solar wind plasma temperature, the weaker the cosmic ray intensity. Hence, the lowest cosmic ray intensity has good correlations with simultaneous solar parameters, while the highest cosmic ray intensity does not. Our results show that higher solar activity is responsible for a higher geomagnetic effect and vice versa.

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Authors and Affiliations

  1. Solar and Space Weather Research Group, Korea Astronomy and Space Science Institute, 61-1, Whaam Dong, Yuseong-gu, Daejeon, 305-348, Republic of Korea

    K. A. Firoz, D. V. Phani Kumar & K.-S. Cho

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  1. K. A. Firoz
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  2. D. V. Phani Kumar
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  3. K.-S. Cho
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Correspondence to K. A. Firoz.

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Firoz, K.A., Kumar, D.V.P. & Cho, KS. On the relationship of cosmic ray intensity with solar, interplanetary, and geophysical parameters. Astrophys Space Sci 325, 185–193 (2010). https://doi.org/10.1007/s10509-009-0181-9

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  • DOI: https://doi.org/10.1007/s10509-009-0181-9

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